CenterState Bank (CSFL) 10-K 5 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 27, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	CenterState Banks, Inc.
Entity Central Index Key	1102266
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		45,392,240
Entity Public Float			$408,116

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS
Cash and due from banks	$52,067	$21,581
Federal funds sold and Federal Reserve Bank deposits	106,346	153,308
Cash and cash equivalents	158,413	174,889
Trading securities, at fair value	3,420
Investment securities available for sale, at fair value	517,457	457,086
Investment securities held to maturity (fair value of $238,431 and $0 at December 31, 2014 and December 31, 2013, respectively)	237,362
Loans held for sale, at lower of cost or fair value	1,251	1,010
Loans, excluding purchased credit impaired	2,152,759	1,242,758
Purchased credit impaired loans	276,766	231,421
Allowance for loan losses	-19,898	-20,454
Net Loans	2,409,627	1,453,725
Bank premises and equipment, net	98,848	96,619
Accrued interest receivable	8,999	6,337
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	14,219	8,189
Goodwill	76,739	44,924
Core deposit intangible	14,417	4,958
Trust intangible	984	1,158
Bank owned life insurance	83,544	49,285
Other repossessed real estate owned covered by FDIC loss share agreements	19,404	19,111
Other repossessed real estate owned	8,896	6,409
FDIC indemnification asset	49,054	73,877
Deferred income tax asset, net	49,587	5,296
Bank property held for sale	2,675	1,582
Prepaid expense and other assets	21,973	11,556
TOTAL ASSETS	3,776,869	2,416,011
Deposits:
Interest bearing	2,043,166	1,411,316
Non-interest bearing	1,048,874	644,915
Total deposits	3,092,040	2,056,231
Securities sold under agreement to repurchase	27,022	20,457
Federal funds purchased	151,992	29,909
Corporate debentures	23,917	16,996
Accrued interest payable	336	333
Payables and accrued expenses	29,085	18,706
Total liabilities	3,324,392	2,142,632
Stockholders’ equity:
Common stock, $.01 par value: 100,000,000 shares authorized; 45,323,553 and 30,112,475 shares issued and outstanding at December 31, 2014 and December 31, 2013, respectively	453	301
Additional paid-in capital	388,698	229,544
Retained earnings	59,273	48,018
Accumulated other comprehensive income ( loss)	4,053	-4,484
Total stockholders’ equity	452,477	273,379
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$3,776,869	$2,416,011

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]
Held-to-maturity securities, fair value	$238,431	$0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	45,323,553	30,112,475
Common stock, shares outstanding	45,323,553	30,112,475

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income:
Loans	$121,262	$88,274	$81,592
Investment securities available for sale:
Taxable	13,991	9,889	11,297
Tax-exempt	1,435	1,430	1,423
Federal funds sold and other	1,539	785	638
Total interest income	138,227	100,378	94,950
Interest expense:
Deposits	6,182	5,184	7,529
Securities sold under agreement to repurchase	181	78	86
Federal funds purchased	51	21	30
Federal Home Loan Bank advances and other borrowings			199
Corporate debentures	942	602	637
Total interest expenses	7,356	5,885	8,481
Net interest income	130,871	94,493	86,469
Provision for loan losses	826	-76	9,220
Net interest income after loan loss provision	130,045	94,569	77,249
Non interest income:
Correspondent banking capital markets revenue	16,400	17,023	32,806
Other correspondent banking related revenue	3,753	3,387	2,901
Service charges on deposit accounts	9,542	8,457	6,598
Debit, prepaid, ATM and merchant card related fees	6,250	5,420	4,623
Wealth management related revenue	4,239	4,551	3,760
FDIC indemnification income	2,982	5,542	6,017
FDIC indemnification asset amortization	-20,743	-13,807	-3,096
Bank owned life insurance income	1,767	1,328	1,436
Other service charges and fees	1,990	985	1,340
Bargain purchase gain			453
Net gain on sale of securities available for sale	46	1,060	2,423
Total other income	26,226	33,946	59,261
Non interest expense:
Salaries, wages and employee benefits	70,375	60,369	69,938
Occupancy expense	10,163	7,702	8,697
Depreciation of premises and equipment	6,066	5,876	5,678
Supplies, stationary and printing	1,319	1,121	1,124
Marketing expenses	2,731	2,517	2,564
Data processing expense	5,484	3,784	3,988
Legal, audit and other professional fees	4,066	3,754	2,527
Core deposit intangible (“CDI”) amortization	2,110	986	1,155
Postage and delivery	1,413	1,084	1,148
ATM and debit card related expenses	1,892	1,788	1,207
Bank regulatory expenses	3,209	2,369	2,429
(Gain)/loss on sale of repossessed real estate (“OREO”)	-788	3,122	1,185
Valuation write down of repossessed real estate (“OREO”)	3,250	6,012	4,258
Loss on repossessed assets other than real estate	45	401	123
Foreclosure related expenses	2,775	3,191	5,640
Merger and acquisition related expenses	11,542	722	2,714
Branch closure and efficiency initiatives	2,764
Other expenses	7,765	5,964	7,605
Total other expenses	136,181	110,762	121,980
Income before provision for income taxes	20,090	17,753	14,530
Provision for income taxes	7,126	5,510	4,625
Net income	12,964	12,243	9,905
Other comprehensive income, net of tax:
Unrealized securities holding gain (loss), net of income taxes	8,565	-11,132	3,097
Less: reclassified adjustments for gain included in net income, net of income taxes, of $18, $409 and $912, respectively	-28	651	1,511
Net unrealized gain (loss) on available for sale securities, net of income taxes	8,537	-11,783	1,586
Total comprehensive income (loss)	$21,501	$460	$11,491
Earnings per share:
Basic	$0.32	$0.41	$0.33
Diluted	$0.31	$0.41	$0.33
Common shares used in the calculation of earnings per share:
Basic	40,852,002	30,102,777	30,073,959
Diluted	41,235,552	30,220,127	30,141,863

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations and Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Reclassifications of gain included in net income, income taxes	($18)	$409	$912

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Gulf Stream [Member]	Gulf Stream [Member]	Gulf Stream [Member]	First Southern Bancorp, Inc. [Member]	First Southern Bancorp, Inc. [Member]	First Southern Bancorp, Inc. [Member]
In Thousands, except Share data, unless otherwise specified							Common Stock [Member]	Additional Paid in Capital [Member]		Common Stock [Member]	Additional Paid in Capital [Member]
Balances at beginning at Dec. 31, 2011	$262,633	$301	$228,342	$28,277	$5,713
Balances at beginning, shares at Dec. 31, 2011	30,055,499
Comprehensive income:
Net income	9,905			9,905
Unrealized holding gain on available for sale securities, net of deferred income tax	1,586				1,586
Total comprehensive income	11,491
Dividends paid - common ($0.04 per share)	-1,203			-1,203
Stock grants issued	247		247
Stock grants issued, shares	24,268
Stock based compensation expense	363		363
Balances at ending at Dec. 31, 2012	273,531	301	228,952	36,979	7,299
Balances at ending, shares at Dec. 31, 2012	30,079,767
Comprehensive income:
Net income	12,243			12,243
Unrealized holding gain on available for sale securities, net of deferred income tax	-11,783				-11,783
Total comprehensive income	460
Dividends paid - common ($0.04 per share)	-1,204			-1,204
Stock grants issued	300		300
Stock grants issued, shares	30,994
Stock based compensation expense	292		292
Stock options exercised including tax benefit, Shares	1,714
Balances at ending at Dec. 31, 2013	273,379	301	229,544	48,018	-4,484
Balances at ending, shares at Dec. 31, 2013	30,112,475
Comprehensive income:
Net income	12,964			12,964
Unrealized holding gain on available for sale securities, net of deferred income tax	8,537				8,537
Total comprehensive income	21,501
Dividends paid - common ($0.04 per share)	-1,709			-1,709
Stock grants issued	681	3	678
Stock grants issued, shares	305,730
Stock based compensation expense	238		238
Stock options exercised, including tax benefit	984	2	982
Stock options exercised including tax benefit, Shares	233,762
Stock issued pursuant to acquisition						53,150	52	53,098	100,636	95	100,541
Stock issued pursuant to acquisition, Shares						5,195,541			9,476,045
Stock options acquired and converted pursuant to Gulfstream acquisition	3,617		3,617
Balances at ending at Dec. 31, 2014	$452,477	$453	$388,698	$59,273	$4,053
Balances at ending, shares at Dec. 31, 2014	45,323,553

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrealized holding gain/loss on available for sale securities, deferred income tax benefit	$5,361	($7,220)	$957
Dividends paid - common, per share	$0.04	$0.04	$0.04
Retained Earnings [Member]
Dividends paid - common, per share	$0.04	$0.04	$0.04
Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized holding gain/loss on available for sale securities, deferred income tax benefit	$5,361	($7,220)	$957

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$12,964	$12,243	$9,905
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	826	-76	9,220
Depreciation of premises and equipment	6,066	5,876	5,678
Accretion of purchase accounting adjustments	-36,198	-32,571	-25,211
Net amortization of investment securities	6,397	6,473	8,562
Net deferred loan origination fees	-525	-862	-181
Net gain on sale of securities available for sale	-46	-1,060	-2,423
Trading securities revenue	-169	-255	-690
Purchases of trading securities	-171,089	-198,186	-367,105
Proceeds from sale of trading securities	167,838	203,489	362,747
Repossessed real estate owned valuation write down	3,250	6,012	4,258
(Gain) loss on sale of repossessed real estate owned	-788	3,122	1,185
Repossessed assets other than real estate valuation write down	32	70	133
Loss on sale of repossessed assets other than real estate	13	331	-10
Gain on sale of loans held for sale	-511	-333	-270
Loans originated and held for sale	-26,056	-20,824	-18,931
Proceeds from sale of loans held for sale	26,573	22,856	20,233
(Gain) loss on disposal of and or sale of fixed assets	-19	-12	-233
Gain on disposal of bank property held for sale	-174
Impairment on bank property held for sale	2,256		614
Deferred income taxes	1,733	32	4,386
Stock based compensation expense	1,577	609	631
Bank owned life insurance income	-1,767	-1,328	-1,436
Bargain purchase gain			-453
Net cash from changes in:
Net changes in accrued interest receivable, prepaid expenses, and other assets	8,467	5,966	-1,721
Net change in accrued interest payable, accrued expense, and other liabilities	727	2,687	-851
Net cash provided by operating activities	1,377	14,259	8,037
Cash flows from investing activities:
Purchases of investment securities		-31,132	-26,157
Purchases of mortgage backed securities	-195,943	-205,005	-178,332
Proceeds from maturities of investment securities		165	312
Proceeds from called investment securities	2,050	9,400	76,245
Proceeds from pay-downs of mortgage backed securities	82,929	101,333	126,381
Proceeds from sales of investment securities	62,111	31,804	22,758
Proceeds from sales of mortgage backed securities	261,426	37,691	146,051
Purchases of investment securities	-75,654
Purchases of mortgage backed securities	-162,377
Proceeds from pay-downs of mortgage backed securities	581
Purchases of FRB and FHLB stock	-3,580		-1,986
Proceeds from sales of FHLB and FRB stock	4,011	1,560	4,835
Net decrease (increase) in loans	24,191	-39,813	51,482
Cash received from FDIC loss sharing agreements	10,014	42,004	21,787
Purchase of bank owned life insurance	-25,000		-10,000
Purchases of premises and equipment, net	-1,987	-4,665	-9,425
Proceeds from sale of repossessed real estate	36,995	28,585	22,900
Proceeds from sale of fixed assets	19	136	1,154
Proceeds from sale of bank property held for sale	10,783	931	505
Net cash from bank acquisitions	130,494		81,061
Net cash provided by/(used in) investing activities	161,063	-27,006	329,571
Cash flows from financing activities:
Net (decrease) increase in deposits	-125,063	59,450	-339,200
Sale of deposits	-169,748
Net (decrease) increase in securities sold under agreement to repurchase	-1,011	1,665	4,140
Net increase (decrease) in federal funds purchased	122,083	-9,023	-15,692
Net decrease in other borrowings	-5,708
Net increase in payable to shareholders for acquisitions	1,256
Stock options exercised, including tax benefit	984
Dividends paid	-1,709	-1,204	-1,203
Net cash provided by/(used in) financing activities	-178,916	50,888	-351,955
Net increase (decrease) in cash and cash equivalents	-16,476	38,141	-14,347
Cash and cash equivalents, beginning of period	174,889	136,748	151,095
Cash and cash equivalents, end of period	158,413	174,889	136,748
Transfer of loans to other real estate owned	16,359	29,581	26,155
Transfers of bank property to held for sale	4,647		2,987
Cash paid during the period for:
Interest	8,543	6,607	10,319
Income taxes	$8,447	$3,473	$10

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	-1	Summary of significant accounting policies
	(a)	Nature of operations and principles of consolidation
	The consolidated financial statements of CenterState Banks, Inc. (the “Company”) include the accounts of CenterState Banks, Inc. (the “Parent Company”), and its wholly owned subsidiaries CenterState Bank of Florida, N.A. and R4ALL, Inc.  All significant intercompany accounts and transactions have been eliminated in consolidation.
	At December 31, 2014, the Company, through its subsidiary banks, operates through 58 full service banking locations in 20 counties throughout Central, Northeast and Southeast Florida, providing traditional deposit and lending products and services to its commercial and retail customers.  The Company’s primary deposit products are checking, savings and term certificate accounts, and its primary lending products include commercial real estate loans, residential real estate loans, commercial loans and consumer loans.  Substantially all loans are secured by commercial real estate, residential real estate, business assets or consumer assets.  There are no significant concentrations of loans to any one industry or customer.  However, the customers’ ability to repay their loans is dependent on the real estate and general economic conditions in the area.
	The Company, through its CenterState Bank of Florida, N.A. subsidiary, also operates a correspondent banking and capital markets division.  The division is integrated with and part of the subsidiary bank located in Winter Haven, Florida, although the majority of the bond salesmen, traders and support personnel are physically located in leased facilities in Birmingham, Alabama and Atlanta, Georgia.  The primary revenue generating activity of this division is commissions earned on fixed income security sales.  Other revenue generating activities include correspondent bank deposits (i.e. federal funds purchased), fees earned on correspondent bank checking accounts, fees earned from safe-keeping activities, bond accounting services for correspondents, and asset/liability consulting related activities.
	R4ALL, Inc. is a non bank subsidiary incorporated during the third quarter of 2009.  The primary purpose of this subsidiary is to purchase, hold, and dispose of troubled assets acquired from the Company’s subsidiary bank.
	The following is a description of the basis of presentation and the significant accounting and reporting policies, which the Company follows in preparing and presenting its consolidated financial statements.
	(b)	Use of estimates
	To prepare financial statements in conformity with U.S. generally accepted accounting principles, management makes estimates and assumptions based on available information.  These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided.  Significant items subject to estimates and assumptions include allowance for loan losses, FDIC indemnification asset, fair values of financial instruments, useful life of intangibles and valuation of goodwill, fair value estimates of stock-based compensation, fair value estimates of OREO, and deferred tax assets.  Actual results could differ from these estimates.
	(c)	Cash flow reporting
	For purposes of the statement of cash flows, the Company considers cash and due from banks, federal funds sold, money market and non interest bearing deposits in other banks with a purchased maturity of three months or less to be cash equivalents.  Net cash flows are reported for customer loan and deposit transactions, interest bearing deposits in other financial institutions, federal funds purchased, repurchase agreements, proceeds from capital offering and other borrowed funds.
	(d)	Interest bearing deposits in other financial institutions
	Interest bearing deposits in other financial institutions mature within one year and are carried at cost and are included in cash and due from banks in the Consolidated Balance Sheets.
	(e)	Trading securities
	The Company engages in trading activities for its own account.  Securities that are held principally for resale in the near term are recorded at fair value with changes in fair value included in earnings.  Interest is included in net interest income.
	(f)	Securities
	Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity.  Debt securities not classified as held to maturity or trading are classified as available for sale.  Securities available for sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of tax.
	Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage backed securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method.
	Securities are evaluated for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) other-than-temporary impairment related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis.
	(g)	Bond commissions revenue recognition
	Bond sales transactions and related revenue and expenses are recorded on a settlement date basis.  The effect on the financial statements of using the settlement date basis rather than the trade date basis is not material.
	(h)	Loans held for sale
	Mortgage loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by outstanding commitments from investors.  Net unrealized losses, if any, are recorded as a valuation allowance and charged to earnings.  Mortgage loans held for sale are generally sold with servicing rights released.  Gains and losses on sales of mortgage loans are based on the difference between the selling price and the carrying value of the related loan sold.
	(i)	Loans
	Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding unpaid principal balance net of purchase premiums and discounts, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the unpaid principal balance. The recorded investment in a loan excludes accrued interest receivable, deferred fees, and deferred costs because they are not considered material.
	A loan is considered a troubled debt restructured loan based on individual facts and circumstances. A modification may include either an increase or reduction in interest rate or deferral of principal payments or both.   Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings. The Company classifies troubled debt restructured loans as impaired and evaluates the need for an allowance for loan losses on a loan-by-loan basis. An allowance for loan losses is based on either the present value of estimated future cash flows or the estimated fair value of the underlying collateral. Loans retain their interest accrual status at the time of modification.
	Loan origination fees and the incremental direct cost of loan origination, are deferred and recognized in interest income without anticipating prepayments over the contractual life of the loans. If the loan is prepaid, the remaining unamortized fees and costs are charged or credited to interest income. Amortization ceases for nonaccrual loans.
	A loan is moved to nonaccrual status in accordance with the Company’s policy typically after 90 days of non-payment, or less than 90 days of non-payment if management determines that the full timely collection of principal and interest becomes doubtful. Past due status is based on the contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. Nonaccrual loans and loans past due 90 days still on accrual include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans.  Single family home loans, consumer loans and smaller commercial, land, development and construction loans (less than $500) are monitored by payment history, and as such, past due payments is generally the triggering mechanism to determine nonaccrual status.  Larger (greater than $500) commercial, land, development and construction loans are monitored on a loan level basis, and therefore in these cases it is more likely that a loan may be placed on nonaccrual status before it becomes 90 days past due.
	All interest accrued but not received for loans placed on nonaccrual, is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Non real estate consumer loans are typically charged off no later than 120 days past due.
	The Company, considering current information and events regarding the borrower’s ability to repay their obligations, considers a loan to be impaired when it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is considered to be impaired, the amount of the impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the secondary market value of the loan, or the fair value of the collateral for collateral dependent loans. Interest income on impaired loans is recognized in accordance with the Company’s non-accrual policy. Impaired loans are written down to the extent that principal is judged to be uncollectible and, in the case of impaired collateral dependent loans where repayment is expected to be provided solely by the underlying collateral and there is no other available and reliable sources of repayment, are written down to the lower of cost or collateral value less estimated selling costs. Impairment losses are included in the allowance for loan losses. Large groups of smaller balance homogeneous loans, such as consumer and residential real estate loans, are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures.
	(j)	Purchased credit-impaired loans
	As a part of business acquisitions, the Company acquires loans, some of which have shown evidence of credit deterioration since origination. These purchased credit-impaired (“PCI”) loans were determined to be credit impaired based on specific risk characteristics of the loan, including product type, domicile of the borrower, past due status, owner occupancy status, geographic location of the collateral, and loan to value ratios. Purchasers are permitted to aggregate credit impaired loans acquired in the same fiscal quarter into one or more pools, provided that the loans have common risk characteristics. A pool is then accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. For the loan portfolios acquired through failed bank acquisitions, the Company aggregated the commercial, consumer, and residential loans into ten pools of loans with common risk characteristics for each FDIC failed institution acquired. These acquired loans were recorded at the acquisition date fair value, and after acquisition, losses are recognized through the allowance for loan losses. The Company estimates the amount and timing of expected cash flows for each acquired loan pool and the expected cash flows in excess of the amount paid is recorded as interest income over the remaining life of the loan pools.
	On a quarterly basis, the Company updates the amount of loan principal and interest cash flows expected to be collected, incorporating assumptions regarding default rates, loss severities, the amounts and timing of prepayments and other factors that are reflective of current market conditions. Probable decreases in expected loan principal cash flows trigger the recognition of impairment, which is then measured as the present value of the expected principal loss plus any related foregone interest cash flows discounted at the pool’s effective interest rate. Impairments that occur after the acquisition date are recognized through the provision for loan losses. Probable and significant increases in expected principal cash flows would first reverse any previously recorded allowance for loan losses; any remaining increases are recognized prospectively as interest income. The impacts of (i) prepayments, (ii) changes in variable interest rates, and (iii) any other changes in the timing of expected cash flows are recognized prospectively as adjustments to interest income. Disposals of loans, which may include sales of loans, receipt of payments in full by the borrower, or foreclosure, result in removal of the loan from the purchased credit impaired portfolio.
	(k)	Concentration of credit risk
	Most of the Company’s business activity is with customers located within Florida.  Therefore, the Company’s exposure to credit risk is significantly affected by changes in the economy and the real estate market within Florida, primarily central, southeastern and northeastern Florida.
	(l)	Allowance for loan losses
	The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged-off.
	The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired. The general component covers loans that are not individually classified as impaired and is based on historical loss experience adjusted for current factors.
	A loan is impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loans, for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired.
	Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed.
	If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Commercial, commercial real estate, land, acquisition and development, and construction loans over $500 are individually evaluated for impairment.  Large groups of smaller balance homogeneous loans, such as consumer and residential real estate loans, are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Company determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses. The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the most recent two years.  The portfolio segments identified by the Company are residential loans, commercial real estate loans, construction and land development loans, commercial and industrial and consumer and other. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; volume and severity of adversely classified or graded loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations.
	At December 31, 2014, the Company evaluated the Gulfstream Business Bank (“GSB”) loans that were not PCI loans as a separate portfolio segment. The Company evaluated this sixth loan portfolio segment during the fourth quarter of 2014 and an initial general loan loss allowance was recorded at December 31, 2014.  The Company considered the levels of and trends in non-performing loans, past-due loans, adverse loan grade classification changes, historical loss rates, environmental factors and impaired loans in arriving at its estimate.   The general loan loss allowance recorded for these performing loans acquired from GSB is allocated between the five portfolio segments as described below.
	The Company segregates and evaluates its loan portfolio through the five portfolio segments: residential real estate, commercial real estate, land/ land development/construction, commercial and consumer/other.
	Residential real estate loans are a mixture of fixed rate and adjustable rate residential mortgage loans, including first mortgages, second mortgages or home equity lines of credit. As a policy, the Company holds adjustable rate loans and sells a portion of its fixed rate loan originations into the secondary market. Changes in interest rates or market conditions may impact a borrower’s ability to meet contractual principal and interest payments. Residential real estate loans are secured by real property.
	Commercial real estate loans include loans secured by office buildings, warehouses, retail stores and other property located in or near our markets. These loans are originated based on the borrower’s ability to service the debt and secondarily based on the fair value of the underlying collateral.
	Land/land development/construction loans include residential and commercial real estate loans and include a mixture of owner occupied and non-owner occupied. The majority of the loans in this category are land related, either undeveloped land, land held for development, residential building lots and commercial building lots. Generally the terms are three to five years, with a potential for renewal at maturity.
	Commercial loans consist of small-to medium-sized businesses including professional associations, medical services, retail trade, transportation, wholesale trade, manufacturing and tourism. Commercial loans are derived from our market areas and underwritten based on the borrower’s ability to service debt from the business’s underlying cash flows. As a general practice, we obtain collateral such as inventory, accounts receivable, equipment or other assets although such loans may be uncollateralized but guaranteed.
	Consumer and other loans include automobiles, boats, mobile homes without land, or uncollateralized but personally guaranteed loans. These loans are originated based primarily on credit scores, debt-to-income ratios and loan-to-value ratios.
	(m)	Transfer of financial assets
	Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished.  Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
	(n)	Other repossessed real estate owned
	Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis.  These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell.  If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense.  Operating costs after acquisition are expensed.  Repossessed real estate is included in other repossessed real estate owned and other repossessed assets other than real estate is included in prepaid expenses and other assets in the Consolidated Balance Sheets.
	(o)	Premises and equipment
	Land is carried at cost.  Premises and equipment are stated at cost less accumulated depreciation.  Depreciation is provided on a straight-line basis over the estimated useful lives of the related assets.  Buildings are depreciated over a 39 year period, and furniture, fixtures and equipment are depreciated over their related useful life (3 to 15 years).  Leasehold improvements are depreciated over the shorter of their useful lives or the term of the lease.  Major renewals and betterments of property are capitalized; maintenance, repairs, and minor renewals and betterments are expensed in the period incurred.  Upon retirement or other disposition of the asset, the asset cost and related accumulated depreciation are removed from the accounts, and gains or losses are included in income.
	(p)	Software costs
	Costs of software developed for internal use, such as those related to software licenses, programming, testing, configuration, direct materials and integration, are capitalized and included in premises and equipment.  Included in the capitalized costs are those costs related to both our personnel and third party consultants involved in the software development and installation.  Once placed in service, the capitalized asset is amortized on a straight-line basis over its estimated useful life, generally three to five years.  Capitalized costs of software developed for internal use are reviewed periodically for impairment.
	(q)	Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock
	The Company’s subsidiary bank is a member of the FHLB and FRB system.  Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts.  FHLB and FRB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value.  Both cash and stock dividends are reported as income.
	(r)	Bank owned life insurance (BOLI)
	The Company, through its subsidiary bank, has purchased life insurance policies on certain key executives. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
	(s)	Goodwill and other intangible assets
	Goodwill resulting from business combinations prior to January 1, 2009 represents the excess of the purchase price over the fair value of the net assets of businesses acquired. Goodwill resulting from business combinations after January 1, 2009, is generally determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but tested for impairment at least annually. The Company has selected November 30 as the date to perform the annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on the Company’s balance sheet.
	The core deposit intangibles are intangible assets arising from either whole bank acquisitions or branch acquisitions. They are initially measured at fair value and then amortized over a ten-year period on an accelerated basis using the projected decay rates of the underlying core deposits.
	The trust intangible represents the value of the Trust business (“Trust”) acquired pursuant to the Company’s January 27, 2012 acquisition of First Guaranty Bank and Trust of Jacksonville (“FGB”) in Jacksonville, Florida.  The intangible was initially measured at fair value and then amortized over a ten-year period on an accelerated basis.
(t)	FDIC Indemnification Asset
The FDIC Indemnification Asset represents the estimated amounts due from the FDIC pursuant to the Loss Share Agreements related to the acquisitions of the three failed banks acquired in 2010, two in 2012 and assumed two additional pursuant to the Company’s 2014 acquisition of First Southern Bank. At acquisition, the FDIC Indemnification Asset represented the discounted value of the FDIC’s reimbursed portion of the estimated losses the Company expects to realize on the loans and other real estate (“Covered Assets”) acquired as a result of the acquisitions. The range of discount rates used on the FDIC Indemnification Asset was 1.21% to 4.53%.  As losses are realized on Covered Assets, the portion that the FDIC pays the Company in cash for principal and up to 90 days of interest reduces the FDIC Indemnification Asset.  On a quarterly basis, the Company will evaluate the FDIC Indemnification Asset to determine if the estimated losses on Covered Assets support the amount recorded as the FDIC Indemnification Asset.  Income accretion is recognized during the loss share period. If the expectation of future losses decline, the income accretion is reduced prospectively over the lesser of the term of the loss share agreement and the estimated remaining life of the Covered Asset.
(u)	Loan commitments and related financial instruments
Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs.  The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay.  Such financial instruments are recorded when they are funded.
(v)	Stock-based compensation
Compensation cost is recognized for stock options and restricted stock awards issued to employees, based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the date of grant is used for restricted stock awards.  During 2014 the Company initiated a Long-Term Incentive Plan which included Performance Share Units (“PSUs”).  The Monte-Carlo Simulation model was used to estimate fair value of the PSUs at the grant date.  Compensation cost is recognized over the required service period, generally defined as the vesting period.
(w)	Income taxes
Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities.  Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates.  A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized.
A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur.  The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination.  For tax positions not meeting the “more likely than not” test, no tax benefit is recorded.
The Company recognizes interest and/or penalties related to income tax matters in other expenses.
(x)	Retirement plans
Employee 401(k) plan expense is the amount of matching contributions.  Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service.
(y)	Marketing and advertising costs
Marketing and advertising costs are expensed as incurred.
(z)	Earnings per common share
Basic earnings per common share is net income divided by the weighted average number of common shares outstanding during the period.  All outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends are considered participating securities for this calculation.  Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock options and unvested restricted stock awards where shares are not issued until vested.  Earnings and dividends per share are restated for all stock splits and stock dividends through the date of issuance of the financial statements.
(aa)	Comprehensive income
Comprehensive income consists of net income and other comprehensive income.  Other comprehensive income includes unrealized gains and losses on securities available for sale, which are also recognized as separate components of shareholders’ equity.
(ab)	Loss contingencies
Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated.  Management does not believe there now are such matters that will have a material effect on the financial statements.
(ac)	Restrictions on cash
Cash on hand or on deposit with the Federal Reserve Bank is generally required to meet regulatory reserve and clearing requirements.
(ad)	Dividend restriction
Banking regulations require maintaining certain capital levels and may limit the dividends paid by the banks to the holding company or by the holding company to stockholders.
(ae)	Fair value of financial instruments
Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in a separate note.  Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items.  Changes in assumptions or in market conditions could significantly affect the estimates.
(af)	Segment reporting
The Company’s correspondent banking and capital markets division represents a distinct reportable segment which differs from the Company’s primary business of commercial and retail banking in Florida.  Accordingly, a reconciliation of reportable segment revenues, expenses and profit to the Company’s consolidated total has been presented in note 25.
(ag)	Derivatives
The Company enters into interest rate swaps in order to provide commercial loan clients the ability to swap from fixed to variable interest rates.  Under these agreements, the Company enters into a fixed-rate loan with a client in addition to a swap agreement.  This swap agreement effectively converts the client’s fixed rate loan into a variable rate.  The Company then enters into a matching swap agreement with a third party dealer in order to offset its exposure on the customer swap.  The Company does not use derivatives for trading purposes. The derivative transactions are considered instruments with no hedging designation, otherwise known as stand-alone derivatives. Changes in the fair value of the derivatives are reported currently in earnings.
(ah)	Reclassifications
Some items in the prior year financial statements were reclassified to conform to the current presentation.  Reclassifications had no effect on prior years’ net income or shareholders’ equity.
(ai)	Effect of new pronouncements
In January 2014, the FASB amended existing guidance to clarify when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan should be derecognized and the real estate recognized. These amendments clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either: (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure, or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additional disclosures are required.  These amendments are effective for public business entities for annual periods and interim periods within those annual periods beginning after December 15, 2014.  Amendments in this standard can be applied using a modified retrospective or prospective transition method.  Early adoption is permitted. The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
In May 2014 the FASB amended existing guidance related to revenue from contracts with customers. This amendment supersedes and replaces nearly all existing revenue recognition guidance, including industry-specific guidance, establishes a new control-based revenue recognition model, changes the basis for deciding when revenue is recognized over time or at a point in time, provides new and more detailed guidance on specific topics and expands and improves disclosures about revenue. In addition, this amendment specifies the accounting for some costs to obtain or fulfill a contract with a customer. These amendments are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period.  Early application is not permitted. The amendments should be applied retrospectively to all periods presented or retrospectively with the cumulative effect recognized at the date of initial application.  The Company is currently evaluating the impact of this new accounting standard on the consolidated financial statements.
In June 2014, the FASB amended existing guidance related to repurchase-to-maturity transactions, repurchase financings, and disclosures. These amendments align the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. The guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. These amendments require a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. These amendments also require expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings.  These amendments are effective for the first interim or annual period beginning after December 15, 2014.  In addition, for public companies, the disclosure for certain transactions accounted for as a sale is effective for the first interim or annual period beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required for annual periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015.  An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption.  Early adoption is prohibited for a public company. Entities may elect to apply the requirements for interim periods beginning after December 15, 2014. The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
In June 2014, the FASB amended existing guidance related to the accounting for share-based payments when the terms of an award provide that a performance target could be achieved after the requisite service period. These amendments require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718, Compensation – Stock Compensation, as it relates to awards with performance conditions that affect vesting to account for such awards. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved.  These amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015.  Early adoption is permitted.  Entities may apply the amendments in this amendment either: (a) prospectively to all awards granted or modified after the effective date; or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter.   The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
In August 2014, the FASB amended existing guidance related to the classification of certain government-guaranteed mortgage loans, including those guaranteed by the FHA and the VA, upon foreclosure. It requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: 1) The loan has a government guarantee that is not separable from the loan before foreclosure; 2) At the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and 3) At the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor.  These amendments are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014.  Early adoption is permitted if the amendments under ASU 2014-04 Receivables – Troubled Debt Restructurings by Creditors – Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure has been adopted. The amendments may be applied using a prospective transition method in which a reporting entity applies the guidance to foreclosures that occur after the date of adoption, or a modified retrospective transition using a cumulative-effect adjustment (through a reclassification to a separate other receivable) as of the beginning of the annual period of adoption.  Prior periods should not be adjusted.  A reporting entity must apply the same method of transition as elected under ASU 2014-04.  The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
In August 2014, the FASB amended existing guidance related to the disclosures about an entity’s ability to continue as a going concern. These amendments are intended to define management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern and to provide related footnote disclosures. These amendments provide guidance to an organization’s management, with principles and definitions that are intended to reduce diversity in the timing and content of disclosures that are commonly provided by organizations in the financial statement footnotes.  The amendments are effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016.  Early application is permitted for annual or interim reporting periods for which the financial statements have not previously been issued.  The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
In July 2013, the FASB amended existing guidance related to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss or a tax credit carryforward exists. These amendments provide that an unrecognized tax benefit, or a portion thereof, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except to the extent that a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date to settle any additional income taxes that would result from disallowance of a tax position, or the tax law does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, then the unrecognized tax benefit should be presented as a liability.  These amendments are effective for interim and annual reporting periods beginning after December 15, 2013.  The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Retrospective application is permitted. Early adoption and retrospective application is permitted. The adoption of this standard did not have a material effect on the Company’s operating results or financial condition.

Trading_Securities

Trading Securities	12 Months Ended
	Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]
Trading Securities	-2	Trading Securities
	Realized and unrealized gains and losses are included in trading securities revenue, a component of non interest income.  Securities purchased for this portfolio have primarily been municipal securities.  A list of the activity in this portfolio for 2014 and 2013 is summarized below.
			2014			2013
	Beginning balance		$	—		$	5,048
	Purchases			171,089			198,186
	Proceeds from sales			(167,838	)		(203,489	)
	Net realized gain on sales			156			255
	Mark-to- market adjustment			13			—
	Ending balance		$	3,420		$	—

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]
Investment Securities	-3	Investment Securities
	Available for Sale
	All of the mortgage backed securities (“MBS”) listed below are residential FNMA, FHLMC, and GNMA MBSs.  The fair value of available for sale securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) were as follows:
			December 31, 2014
					Gross		Gross
			Amortized		Unrealized		Unrealized		Fair
			Cost		Gains		Losses		Value
	Obligations of U.S. government sponsored entities and agencies		$	3	$	—	$	—	$	3
	Mortgage backed securities			473,396		6,897		1,660		478,633
	Municipal securities			37,460		1,412		51		38,821
	Total available-for-sale		$	510,859	$	8,309	$	1,711	$	517,457
			31-Dec-13
					Gross		Gross
			Amortized		Unrealized		Unrealized		Fair
			Cost		Gains		Losses		Value
	Obligations of U.S. government sponsored entities and agencies		$	4	$	—	$	—	$	4
	Mortgage backed securities			424,654		4,623		12,396		416,881
	Municipal securities			39,728		921		448		40,201
	Total available-for-sale		$	464,386	$	5,544	$	12,844	$	457,086
	Sales of available for sale securities were as follows:
			2014		2013		2012
	Proceeds		$	323,537	$	69,495	$	168,809
	Gross gains		$	1,175	$	1,060	$	2,706
	Gross losses		$	1,129	$	—	$	283
	The tax provisions related to these net realized gains were $18, $409 and $912, respectively.
	Available for sale securities pledged at December 31, 2014 and 2013 had a carrying amount (estimated fair value) of $139,297 and $108,528, respectively.  These securities were pledged primarily to secure public deposits and repurchase agreements.
	At year-end 2014 and 2013, there were no holdings of held to maturity securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity.
	The fair value and amortized cost of available for sale securities at year end 2014 by contractual maturity were as follows.  Mortgage-backed securities are not due at a single maturity date and are shown separately.
					Amortized
	Investment securities available for sale:		Fair Value		Cost
	Due in one year or less		$	532	$	517
	Due after one year through five years			1,565		1,498
	Due after five years through ten years			17,262		16,638
	Due after ten years through thirty years			19,465		18,810
	Mortgage backed securities			478,633		473,396
	Total available-for-sale		$	517,457	$	510,859
	The following tables show the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2014 and 2013.
			December 31, 2014
			Less than 12 months				12 months or more				Total
					Unrealized				Unrealized				Unrealized
			Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	Mortgage backed securities		$	15,876	$	41	$	99,010	$	1,619	$	114,886	$	1,660
	Municipal securities			—		—		3,194		51		3,194		51
	Total temporarily impaired available-for-sale securities		$	15,876	$	41	$	102,204	$	1,670	$	118,080	$	1,711
			31-Dec-13
			Less than 12 months				12 months or more				Total
					Unrealized				Unrealized				Unrealized
			Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	Mortgage backed securities		$	239,641	$	10,221	$	18,793	$	2,175	$	258,434	$	12,396
	Municipal securities			7,603		333		1,010		115		8,613		448
	Total temporarily impaired available-for-sale securities		$	247,244	$	10,554	$	19,803	$	2,290	$	267,047	$	12,844
	Mortgage-backed securities:  At December 31, 2014, 100% of the mortgage-backed securities held by the Company were issued by U.S. government-sponsored entities and agencies, primarily Fannie Mae, Freddie Mac, and Ginnie Mae, institutions which the government has affirmed its commitment to support. Because the decline in fair value is attributable to changes in interest rates and illiquidity, and not credit quality, and because the Company does not have the intent to sell these mortgage-backed securities and it is likely that it will not be required to sell the securities before their anticipated recovery, the Company does not consider these securities to be other-than-temporarily impaired at December 31, 2014.
	Municipal securities:  Unrealized losses on municipal securities have not been recognized into income because the issuers bonds are of high quality, and because management does not intend to sell these investments or more likely than not will not be required to sell these investments before their anticipated recovery.  The fair value is expected to recover as the securities approach maturity.
	Held to Maturity
	The following reflects the fair value of held to maturity securities and the related gross unrecognized gains and losses as of December 31, 2014. There were no securities held to maturity as of December 31, 2013.
			December 31, 2014
					Gross		Gross
			Amortized		Unrecognized		Unrecognized		Fair
			Cost		Gains		Losses		Value
	Obligations of U.S. government sponsored entities and agencies		$	49,793	$	122	$	—	$	49,915
	Mortgage backed securities			161,727		653		—		162,381
	Municipal securities			25,842		305		12		26,135
	Total held to maturity		$	237,362	$	1,080	$	12	$	238,431
	Held to maturity securities pledged at December 31, 2014 had an estimated fair value of $51,531.  There were no securities held to maturity pledged at December 31, 2013.  These securities were pledged primarily to secure public deposits and repurchase agreements.
At year-end 2014, there were no holdings of held to maturity securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity.
The fair value and amortized cost of held to maturity securities at year end 2014 by contractual maturity were as follows.  Mortgage-backed securities are not due at a single maturity date and are shown separately.
				Amortized
Investment securities held to maturity		Fair Value		Cost
Due after five years through ten years		$	44,515	$	44,393
Due after ten years through thirty years			31,535		31,242
Mortgage backed securities			162,381		161,727
Total held-to-maturity		$	238,431	$	237,362
The following tables show the Company’s held to maturity investments’ gross unrecognized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrecognized loss position, at December 31, 2014.
		December 31, 2014
		Less than 12 months				12 months or more				Total
				Unrecognized				Unrecognized				Unrecognized
		Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Municipal securities		$	2,475	$	12	$	—	$	—	$	2,475	$	12
Total temporarily impaired available-for-sale securities		$	2,475	$	12	$	—	$	—	$	2,475	$	12
Municipal securities:  Unrecognized losses on municipal securities have not been recognized into income because the issuers bonds are of high quality, and because management does not intend to sell these investments or more likely than not will not be required to sell these investments before their anticipated recovery.  The fair value is expected to recover as the securities approach maturity.

Loans

Loans	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Loans	-4	Loans
	Major categories of loans included in the loan portfolio as of December 31, 2014 and 2013 are:
			December 31,
			2014			2013
	Loans excluding PCI loans
	Real estate loans
	Residential		$	589,068		$	458,331
	Commercial			1,132,933			528,710
	Land, development and construction			79,002			62,503
	Total real estate			1,801,003			1,049,544
	Commercial			294,493			143,263
	Consumer and other loans			56,334			49,547
	Loans before unearned fees and deferred cost			2,151,830			1,242,354
	Net unearned fees and costs			929			404
	Total loans excluding PCI loans			2,152,759			1,242,758
	PCI loans (note 1)
	Real estate loans
	Residential			102,009			120,030
	Commercial			140,977			100,012
	Land, development and construction			24,032			6,381
	Total real estate			267,018			226,423
	Commercial			8,953			3,850
	Consumer and other loans			795			1,148
	Total PCI loans			276,766			231,421
	Total loans			2,429,525			1,474,179
	Allowance for loan losses for loans that are not PCI loans			(19,384	)		(19,694	)
	Allowance for loan losses for PCI loans			(514	)		(760	)
	Total loans, net of allowance for loan losses		$	2,409,627		$	1,453,725
	note 1:  Purchased credit impaired (“PCI”) loans are being accounted for pursuant to ASC Topic 310-30.
	The following sets forth the covered FDIC loans included in the table above.
			December 31,
			2014			2013
	FDIC covered loans that are not PCI loans
	Real estate loans
	Residential		$	3,895		$	—
	Commercial			33,606			—
	Land, development and construction			866			—
	Total real estate			38,367			—
	Commercial			1,253			—
	Consumer and other loans			—			—
	FDIC covered loans, excluding PCI loans			39,620			—
	FDIC covered PCI loans (note 1)
	Real estate loans
	Residential			98,075			120,030
	Commercial			116,457			100,012
	Land, development and construction			15,395			6,381
	Total real estate			229,927			226,423
	Commercial			4,974			3,850
	Consumer and other loans			—			—
	Total FDIC covered PCI loans			234,901			230,273
	Total FDIC covered loans			274,521			230,273
	Allowance for loan losses for FDIC covered loans that are not PCI loans			—			—
	Allowance for loans losses for FDIC covered			(514	)		(760	)
	Total covered loans, net of allowance  for loan losses		$	274,007		$	229,513
	note 1:  Purchased credit impaired (“PCI”) loans are being accounted for pursuant to ASC Topic 310-30.
	The Company acquired FDIC covered loans that are not PCI loans pursuant to the acquisition of FSB on June 1, 2014. Prior to the FSB acquisition, the Company’s FDIC covered loans were all PCI loans.
	Changes in the allowance for loan losses by portfolio segment for the years ended December 31, 2014, 2013 and 2012, are below.
			Real Estate Loans
			Residential			Commercial			Land, develop.,			Comm. &			Consumer & other			Total
									constr.			industrial
	Allowance for loan losses for loans that are not PCI loans:
	Twelve months ended December 31, 2014
	Beginning of the period		$	8,785		$	6,441		$	3,069		$	510		$	889		$	19,694
	Charge-offs			(1,382	)		(353	)		(124	)		(699	)		(879	)		(3,437	)
Recoveries			1,018			763			106			85			184			2,156
Provision for loan losses			(1,678	)		1,418			(2,299	)		2,434			1,096			971
Balance at end of period		$	6,743		$	8,269		$	752		$	2,330		$	1,290		$	19,384
Twelve months ended December 31, 2013
Beginning of the period		$	6,831		$	8,272		$	6,211		$	1,745		$	974		$	24,033
Charge-offs			(3,701	)		(1,144	)		(310	)		(120	)		(903	)		(6,178	)
Recoveries			432			417			193			51			181			1,274
Provision for loan losses			5,223			(1,104	)		(3,025	)		(1,166	)		637			565
Balance at end of period		$	8,785		$	6,441		$	3,069		$	510		$	889		$	19,694
Twelve months ended December 31, 2012
Beginning of the period		$	6,700		$	8,825		$	9,098		$	1,984		$	952		$	27,559
Charge-offs			(3,968	)		(2,862	)		(4,646	)		(231	)		(807	)		(12,514	)
Recoveries			378			871			604			22			157			2,032
Provision for loan losses			3,721			1,438			1,155			(30	)		672			6,956
Balance at end of period		$	6,831		$	8,272		$	6,211		$	1,745		$	974		$	24,033
Allowance for loan losses for loans that are PCI loans:
Twelve months ended December 31, 2014
Beginning of the period		$	—		$	138		$	89		$	533		$	—		$	760
Charge-offs			—			—			—			(101	)		—			(101	)
Recoveries			—			—			—			—			—			—
Provision for loan losses			—			234			(83	)		(296	)		—			(145	)
Balance at end of period		$	—		$	372		$	6		$	136		$	—		$	514
Twelve months ended December 31, 2013
Beginning of the period		$	—		$	2,335		$	—		$	314		$	—		$	2,649
Charge-offs			—			(1,248	)		—			—			—			(1,248	)
Recoveries			—			—			—			—			—			—
Provision for loan losses			—			(949	)		89			219			—			(641	)
Balance at end of period		$	—		$	138		$	89		$	533		$	—		$	760
Twelve months ended December 31, 2012
Beginning of the period		$	82		$	223		$	40		$	14		$	26		$	385
Charge-offs			—			—			—			—			—			—
Recoveries			—			—			—			—			—			—
Provision for loan losses			(82	)		2,112			(40	)		300			(26	)		2,264
Balance at end of period		$	—		$	2,335		$	—		$	314		$	-		$	2,649
The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of December 31, 2014 and 2013.  Accrued interest receivable and unearned fees/costs are not included in the recorded investment because they are not material.
	Real Estate Loans
As of December 31, 2014		Residential			Commercial			Land,			Comm. &			Consumer			Total
								develop.,			industrial			& other
								constr.
Allowance for loan losses:
Ending allowance balance attributable to loans:
Individually evaluated for impairment		$	419		$	403		$	272		$	4		$	17		$	1,115
Collectively evaluated for impairment			6,324			7,866			480			2,326			1,273			18,269
Purchased credit impaired			—			372			6			136			—			514
Total ending allowance balance		$	6,743		$	8,641		$	758		$	2,466		$	1,290		$	19,898
Loans:
Individually evaluated for impairment		$	9,980		$	10,902		$	2,748		$	1,365		$	255		$	25,250
Collectively evaluated for impairment			579,088			1,122,031			76,254			293,128			56,079			2,126,580
Purchased credit impaired			102,009			140,977			24,032			8,953			795			276,766
Total ending loan balances		$	691,077		$	1,273,910		$	103,034		$	303,446		$	57,129		$	2,428,596
	Real Estate Loans
As of December 31, 2013		Residential			Commercial			Land,			Comm. &			Consumer			Total
								develop.,			industrial			& other
								constr.
Allowance for loan losses:
Ending allowance balance attributable to loans:
Individually evaluated for impairment		$	395		$	1,377		$	16		$	2		$	21		$	1,811
Collectively evaluated for impairment			8,390			5,064			3,053			508			868			17,883
Purchased credit impaired			—			138			89			533			—			760
Total ending allowance balance		$	8,785		$	6,579		$	3,158		$	1,043		$	889		$	20,454
Loans:
Individually evaluated for impairment		$	8,610		$	12,564		$	1,307		$	1,297		$	332		$	24,110
Collectively evaluated for impairment			449,721			516,146			61,196			141,966			49,215			1,218,244
Purchased credit impaired			120,030			100,012			6,381			3,850			1,148			231,421
Total ending loan balance		$	578,361		$	628,722		$	68,884		$	147,113		$	50,695		$	1,473,775
Loans collectively evaluated for impairment reported at December 31, 2014 include loans acquired from FSB on June 1, 2014 and from GSB on January 17, 2014 that are not PCI loans.  These loans are performing loans recorded at estimated fair value at the acquisition date. The fair value adjustment for loans acquired from FSB at the acquisition date was approximately $9,725, or approximately 2.0% of the outstanding aggregate loan balances. This amount is accreted into interest income over the remaining lives of the related loans on a level yield basis, but remains adequate at December 31, 2014 and therefore no provision for loan loss was recorded related to these loans at December 31, 2014.
The following is a summary of information regarding impaired loans at December 31, 2014 and 2013:
		December 31,
		2014			2013
Performing TDRs (these are not included in nonperforming loans (“NPLs”))		$	11,418		$	10,763
Nonperforming TDRs (these are included in NPLs)			3,648			4,684
Total TDRs (these are included in impaired loans)			15,066			15,447
Impaired loans that are not TDRs			10,184			8,663
Total impaired loans		$	25,250		$	24,110
Troubled Debt Restructurings:
In certain circumstances it may be beneficial to modify or restructure the terms of a loan (i.e. troubled debt restructure or “TDR”) and work with the borrower for the benefit of both parties, versus forcing the property into foreclosure and having to dispose of it in an unfavorable real estate market.  When the Company modifies the terms of a loan, it usually either reduces the monthly payment and/or interest rate for generally twelve to twenty-four months.  The Company has not forgiven any material principal amounts on any loan modifications to date.  The Company has $15,066 of TDRs.  Of this amount $11,418 are performing pursuant to their modified terms, and $3,648 are not performing and have been placed on non-accrual status and included in our nonperforming loans (“NPLs”).
TDRs as of December 31, 2014 and 2013 quantified by loan type classified separately as accrual (performing loans) and non-accrual (nonperforming loans) are presented in the table below.
As of December 31, 2014		Accruing			Non Accrual			Total
Real estate loans:
Residential		$	7,201		$	1,523		$	8,724
Commercial			2,762			1,794			4,556
Land, development, construction			547			241			788
Total real estate loans			10,510			3,558			14,068
Commercial			706			37			743
Consumer and other			202			53			255
Total TDRs		$	11,418		$	3,648		$	15,066
As of December 31, 2013		Accruing			Non-Accrual			Total
Real estate loans:
Residential		$	7,221		$	1,389		$	8,610
Commercial			2,169			3,077			5,246
Land, development, construction			608			47			655
Total real estate loans			9,998			4,513			14,511
Commercial			555			49			604
Consumer and other			210			122			332
Total TDRs		$	10,763		$	4,684		$	15,447
The Company’s policy is to return non-accrual TDR loans to accrual status when all the principal and interest amounts contractually due, pursuant to its modified terms, are brought current and future payments are reasonably assured.  The Company’s policy also considers the payment history of the borrower, but is not dependent upon a specific number of payments.  The Company recorded a provision for loan loss expense of $422 and $890 and partial charge offs of $251 and $449 on the TDR loans described above during the periods ending December 31, 2014 and 2013, respectively.
Loans are modified to minimize loan losses when management believes the modification will improve the borrower’s financial condition and ability to repay the loan.  The Company typically does not forgive principal.  The Company generally either reduces interest rates or decreases monthly payments for a temporary period of time and those reductions of cash flows are capitalized into the loan balance.  The Company may also extend maturities, convert balloon loans to longer term amortizing loans, or vice versa, or change interest rates between variable and fixed rate. Each borrower and situation is unique and management tries to accommodate the borrower and minimize the Company’s potential losses.  Approximately 76% of the Company’s TDRs are current pursuant to their modified terms, and about $3,648, or approximately 24% of the Company’s total TDRs are not performing pursuant to their modified terms.  There does not appear to be any significant difference in success rates with one type of concession versus another.
The following table presents loans by class modified as TDRs for which there was a payment default within twelve months following the modification during the years ending December 31, 2014 and 2013.
		Year Ending						Year Ending
		31-Dec-14						31-Dec-13
		Number			Recorded			Number			Recorded
		of loans			investment			of loans			investment
Residential			1		$	188			3		$	562
Commercial real estate			5			747			5			1,662
Land, development, construction			2			241			—			—
Commercial and Industrial			—			—			1			25
Consumer and other			2			36			1			18
Total			10		$	1,212			10		$	2,267
The Company recorded $97 and $574 in provision for loan loss expense and $65 and $197 in partial charge offs on TDR loans that subsequently defaulted as described above during the years ending December 31, 2014 and 2013, respectively.
The Company has allocated $779 and $703 of specific reserves to customers whose loan terms have been modified in troubled debt restructurings as of December 31, 2014 and 2013.   The Company has not committed to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings.
The following tables present loans individually evaluated for impairment by class of loans as of December 31, 2014 and 2013 excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30.  The recorded investment is less than the unpaid principal balance primarily due to partial charge-offs.
As of December 31, 2014		Unpaid principal			Recorded investment			Allowance for loan losses allocated
		balance
With no related allowance recorded:
Residential real estate		$	6,797		$	6,672		$	—
Commercial real estate			8,208			8,059			—
Land, development, construction			2,234			1,606			—
Commercial and industrial			1,132			1,129			—
Consumer, other			—						—
With an allowance recorded:
Residential real estate			3,451			3,308			419
Commercial real estate			3,024			2,843			403
Land, development, construction			1,187			1,142			272
Commercial and industrial			283			236			4
Consumer, other			267			255			17
Total		$	26,583		$	25,250		$	1,115
As of December 31, 2013		Unpaid principal balance			Recorded investment			Allowance for loan losses allocated
With no related allowance recorded:
Residential real estate		$	5,052		$	4,803		$	—
Commercial real estate			9,330			7,439			—
Land, development, construction			1,377			1,168			—
Commercial and industrial			1,330			1,241			—
Consumer, other			5			5			—
With an allowance recorded:
Residential real estate			3,942			3,807			395
Commercial real estate			5,257			5,125			1,377
Land, development, construction			147			139			16
Commercial and industrial			102			56			2
Consumer, other			340			327			21
Total		$	26,882		$	24,110		$	1,811
December 31, 2014		Average of impaired loans			Interest income recognized during			Cash basis interest income
					impairment			recognized
Real estate loans:
Residential		$	9,584		$	318		$	—
Commercial			12,282			145			—
Land, development, construction			2,138			37			—
Total real estate loans			24,004			500			—
Commercial and industrial			2,001			67			—
Consumer and other loans			296			12			—
Total		$	26,301		$	579		$	—
December 31, 2013		Average of impaired loans			Interest income recognized during impairment			Cash basis interest income recognized
Real estate loans:
Residential		$	8,968		$	290		$	—
Commercial			26,060			870			—
Land, development, construction			1,405			17			—
Total real estate loans			36,433			1,177			—
Commercial and industrial			1,878			35			—
Consumer and other loans			363			11			—
Total		$	38,674		$	1,223		$	—
December 31, 2012		Average of impaired loans			Interest income recognized during impairment			Cash basis interest income recognized
Real estate loans:
Residential		$	10,136		$	306		$	—
Commercial			29,877			1,215			—
Land, development, construction			3,888			23			—
Total real estate loans			43,901			1,544			—
Commercial and industrial			4,175			110			—
Consumer and other loans			439			17			—
Total		$	48,515		$	1,671		$	—
The following tables present the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans as of December 31, 2014 and 2013 excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30:
As of December 31, 2014		Nonaccrual			Loans past due over 90 days still accruing
Residential real estate		$	11,901		$	—
Commercial real estate			8,470			—
Land, development, construction			2,374			—
Commercial			2,475			—
Consumer, other			375			—
Total		$	25,595		$	—
As of December 31, 2013		Nonaccrual			Loans past due over 90 days still accruing
Residential real estate		$	10,162		$	—
Commercial real estate			13,925			—
Land, development, construction			1,099			—
Commercial			1,582			—
Consumer, other			309			—
Total		$	27,077		$	—
The following tables present the aging of the recorded investment in past due loans as of December 31, 2014 and 2013, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30:
		Accruing Loans
		Total			30 - 59			60 - 89			Greater than			Total Past			Loans Not			Nonaccrual Loans
					days past			days past			90 days past			Due			Past Due
					due			due			due
As of December 31, 2014
Residential real estate		$	589,068		$	2,162		$	1,451		$	—		$	3,613		$	573,554		$	11,901
Commercial real estate			1,132,933			1,840			3,394			—			5,234			1,119,229			8,470
Land/dev/construction			79,002			378			404			—			782			75,846			2,374
Commercial			294,493			1,427			1,492			—			2,919			289,099			2,475
Consumer			56,334			411			149			—			560			55,399			375
		$	2,151,830		$	6,218		$	6,890		$	—		$	13,108		$	2,113,127		$	25,595
		Accruing Loans
		Total			30 - 59			60 - 89			Greater than			Total Past			Loans Not			Nonaccrual Loans
					days past			days past			90 days past			Due			Past Due
					due			due			due
As of December 31, 2013
Residential real estate		$	458,331		$	2,801		$	1,942		$	—		$	4,743		$	443,426		$	10,162
Commercial real estate			528,710			2,420			1,941			—			4,361			510,424			13,925
Land/dev/construction			62,503			136			241			—			377			61,027			1,099
Commercial			143,263			491			1			—			492			141,189			1,582
Consumer			49,547			295			240			—			535			48,703			309
		$	1,242,354		$	6,143		$	4,365		$	—		$	10,508		$	1,204,769		$	27,077
Credit Quality Indicators:
The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as:  current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors.  The Company analyzes loans individually by classifying the loans as to credit risk. This analysis is performed on at least an annual basis.  The Company uses the following definitions for risk ratings:
Special Mention:  Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.
Substandard:  Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected.
Doubtful: Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.
Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered to be pass rated loans.  As of December 31, 2014 and 2013, and based on the most recent analysis performed, the risk category of loans by class of loans, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30, is as follows:
		As of December 31, 2014
Loan Category		Pass			Special Mention			Substandard			Doubtful
Residential real estate		$	558,312		$	7,053		$	23,703		$	—
Commercial real estate			1,063,979			34,953			34,001			—
Land/dev/construction			65,216			9,731			4,055			—
Commercial			285,549			4,419			4,525			—
Consumer			55,590			278			466			—
Total		$	2,028,646		$	56,434		$	66,750		$	—
		As of December 31, 2013
Loan Category		Pass			Special Mention			Substandard			Doubtful
Residential real estate		$	428,671		$	6,438		$	23,222		$	—
Commercial real estate			448,762			46,427			33,521			—
Land/dev/construction			50,164			9,566			2,773			—
Commercial			134,901			4,490			3,872			—
Consumer			49,448			526			573			—
Total		$	1,111,946		$	67,447		$	63,961		$	—
The Company considers the performance of the loan portfolio and its impact on the allowance for loan losses.  For residential and consumer loan classes, the Company also evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity.  The following table presents the recorded investment in residential and consumer loans, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30, based on payment activity as of December 31, 2014 and 2013:
As of December 31, 2014		Residential			Consumer
Performing		$	577,167		$	55,959
Nonperforming			11,901			375
Total		$	589,068		$	56,334
As of December 31, 2013		Residential			Consumer
Performing		$	448,169		$	49,238
Nonperforming			10,162			309
Total		$	458,331		$	49,547
Purchased Loans:
Income recognized on loans purchased from the FDIC is recognized pursuant to ASC Topic 310-30. A portion of the fair value discount has been ascribed as an accretable yield that is accreted into interest income over the estimated remaining life of the loans. The remaining non-accretable difference represents cash flows not expected to be collected.
The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans as of December 31, 2014 and 2013.  Contractually required principal and interest payments have been adjusted for estimated prepayments.
		December 31,
		2014			2013			2012
Contractually required principal and interest		$	460,836		$	389,537		$	534,989
Non-accretable difference			(68,757	)		(55,304	)		(142,855	)
Cash flows expected to be collected			392,079			334,233			392,134
Accretable yield			(115,313	)		(102,812	)		(93,107	)
Carrying value of acquired loans			276,766			231,421			299,027
Allowance for loan losses			(514	)		(760	)		(2,649	)
Carrying value less allowance for loan losses		$	276,252		$	230,661		$	296,378
$(145), $(641) and $2,264 of the allowance for loan losses was recognized in the loan loss provision during 2014, 2013 and 2012, respectively.  There were reversals in the loan loss allowance of $0, $0 and $0 for recoveries in 2014, 2013 and 2012, respectively. The Company adjusted its estimates of future expected losses, cash flows and renewal assumptions during the current year.  These adjustments resulted in an increase in expected cash flows and accretable yield, and a decrease in the non-accretable difference. The Company reclassified approximately $14,892 from non-accretable difference to accretable yield during the twelve month period ending December 31, 2014 to reflect the adjusted estimates of future expected cash flows.
The Company recognized approximately $34,168 of accretion income during the twelve month period ending December 31, 2014.  The table below summarizes the changes in total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans during the periods ending December 31, 2014 and 2013.
					Effect of			income			all other
		December 31, 2013			acquisitions			accretion			adjustments			December 31, 2014
Contractually required principal and interest		$	389,537		$	229,249		$	—		$	(157,950	)	$	460,836
Non-accretable difference			(55,304	)		(45,293	)		—			31,840			(68,757	)
Cash flows expected to be collected			334,233			183,956			—			(126,110	)		392,079
Accretable yield			(102,812	)		(32,204	)		34,168			(14,465	)		(115,313	)
Carry value of acquired loans		$	231,421		$	151,752		$	34,168		$	(140,575	)	$	276,766
						income			all other
			December 31, 2012			accretion			adjustments			December 31, 2013
Contractually required principal and interest		$	534,989		$	—		$	(145,452	)	$	389,537
Non-accretable difference			(142,855	)		—			87,551			(55,304	)
Cash flows expected to be collected			392,134			—			(57,901	)		334,233
Accretable yield			(93,107	)		32,725			(42,430	)		(102,812	)
Carry value of acquired loans		$	299,027		$	32,725		$	(100,331	)	$	231,421

FDIC_Indemnification_Asset

FDIC Indemnification Asset	12 Months Ended
	Dec. 31, 2014
Fdic Loss Share Indemnification Asset [Abstract]
FDIC Indemnification Asset	-5	FDIC indemnification asset
	The FDIC indemnification asset represents the estimated amounts due from the FDIC pursuant to the Loss Share Agreements related to the acquisition of the three failed banks acquired in 2010, the acquisition of two failed banks in 2012 and the assumption of Loss Share Agreements of two failed banks assumed by the Company pursuant to its acquisition of First Southern Bank in June 2014. The activity in the FDIC loss share indemnification asset is as follows (certain items related to true-up payment liabilities per the FDIC agreements, which had previously been netted with the FDIC indemnification asset, have been reclassified as a separate liability):
			2014			2013
	Beginning of the year		$	73,877		$	119,691
	Effect of acquisition			2,636			—
	Amortization, net			(20,664	)		(13,765	)
	Indemnification revenue			3,098			6,055
	Indemnification of foreclosure expense			237			4,413
	Proceeds from FDIC			(10,014	)		(42,004	)
	Impairment (recovery) of loan pool			(116	)		(513	)
	Period end balance		$	49,054		$	73,877
	The FDIC agreements allow for the recovery of some payments made for loss share reimbursements under certain conditions based on the actual performance of the portfolios acquired. This true-up payment is estimated and accrued for as part of the overall FDIC indemnification asset analysis and is reflected as a separate liability. The accrual for this liability is reflected as additional amortization income or expense in noninterest income. The activity in the true-up payment liability is as follows:
			2014			2013
	Beginning of the year		$	444		$	402
	Effect of acquisition			682			—
	True-up liability accrual			79			42
	Period end balance		$	1,205		$	444
	Impairment of loan pools
	When a loan pool (with loss share) is impaired, the impairment expense is included in provision for loan losses, and the percentage of that loss to be reimbursed by the FDIC is recognized as income from FDIC reimbursement, and included in this line item. During the twelve month period ended December 31, 2014, the estimated amount of impairment decreased, which resulted in a reduction of $116 of indemnification income.
	Indemnification revenue
	Indemnification revenue represents the percentage of the cost incurred that is reimbursable by the FDIC pursuant to the related Loss Share Agreement for expenses related to the repossession process and losses incurred on the sale of OREO, or writedown of OREO values to current fair value.
	Amortization, net
	On the date of an FDIC acquisition, the Company estimates the amount and the timing of expected future losses that will be covered by the FDIC loss sharing agreements. The FDIC indemnification asset is initially recorded as the discounted value of the reimbursement of losses from the FDIC. Discount accretion is recognized over the estimated period of losses. The Company also updates its estimate of future losses and the timing of the losses each quarter. To the extent management estimates that future losses are less than initial estimate of future losses, management adjusts its estimates of future expected reimbursements and any decrease in the expected future reimbursements is amortized over the shorter of the loss share period or the life of the related loan by amortization in this line item. Based upon the most recent estimate of future losses, the Company expects less reimbursements from the FDIC and is amortizing the estimated reduction as described in the previous sentence.
	Indemnification of foreclosure expense
	Indemnification of foreclosure expense represents the percentage of foreclosure related expenses incurred and reimbursable from the FDIC. Foreclosure expense is included in non interest expense. The amount of the reimbursable portion of the expense reduces foreclosure expense included in non interest expense.

Other_Real_Estate_Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2014
Real Estate [Abstract]
Other Real Estate Owned	-6	Other real estate owned
	Other real estate owned means real estate acquired through or instead of loan foreclosure.  Activity in the valuation allowance was as follows:
			2014			2013			2012
	Beginning of year		$	5,887		$	5,407		$	4,680
	Valuation write down of repossessed real estate			3,250			6,012			4,258
	Sales and/or dispositions			(6,034	)		(5,532	)		(3,531	)
	End of year		$	3,103		$	5,887		$	5,407
	Expenses related to foreclosed real estate include:
			2014			2013			2012
	(Gain) loss on sale of repossessed real estate		$	(788	)	$	3,122		$	1,185
	Valuation write down of repossessed real estate			3,250			6,012			4,258
	Operating expenses, net of rental income			2,775			3,191			4,008
	Total		$	5,237		$	12,325		$	9,451

Fair_Value

Fair Value	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value	-7	Fair value
	Generally accepted accounting principles establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:
	Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.
	Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
	Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.
	The fair values of securities available for sale are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1 inputs) or matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs).
	The fair values of trading securities are determined as follows: (1) for those securities that have traded prior to the date of the consolidated balance sheet but have not settled (date of sale) until after such date, the sales price is used as the fair value; and, (2) for those securities which have not traded as of the date of the consolidated balance sheet, the fair value was determined by broker price indications of similar or same securities.
	The mortgage backed securities held by the Company were issued by U. S. government sponsored entities and agencies.  Assets and liabilities measured at fair value on a recurring basis are summarized below.
	The fair value of impaired loans with specific valuation allowance for loan losses and other real estate owned is based on recent real estate appraisals less estimated costs of sale. For residential real estate impaired loans and other real estate owned, appraised values are based on the comparative sales approach. For commercial and commercial real estate impaired loans and other real estate owned, appraisers may use either a single valuation approach or a combination of approaches such as comparative sales, cost or the income approach. A significant unobservable input in the income approach is the estimated income capitalization rate for a given piece of collateral. At December 31, 2014, the range of capitalization rates utilized to determine the fair value of the underlying collateral ranged from 8% to 11%. Adjustments to comparable sales may be made by the appraiser to reflect local market conditions or other economic factors and may result in changes in the fair value of a given asset over time. As such, the fair value of impaired loans and other real estate owned are considered a Level 3 in the fair value hierarchy.
	The fair value of derivatives is based on valuation models using observable market data as of the measurement date (Level 2).
					Fair value measurements using
							Significant
					Quoted prices in		other				Significant
					active markets for		observable				unobservable
			Carrying		identical assets		inputs				inputs
			value		(Level 1)		(Level 2)				(Level 3)
	at December 31, 2014
	Assets:
	Trading securities		$	3,420	—		$	3,420			—
	Available for sale securities
	U.S. government sponsored entities and agencies			3	—			3			—
	Mortgage backed securities			478,633	—			478,633			—
	Municipal securities			38,821	—			38,821			—
	Interest rate swap derivatives			6,800	—			6,800			—
	Liabilities:
	Interest rate swap derivatives			7,575	—			7,575			—
	at December 31, 2013
	Assets:
	Trading securities		$      ---		—		$      ---				—
	Available for sale securities
	U.S. government sponsored entities and agencies			4	—			4			—
	Mortgage backed securities			416,881	—			416,881			—
	Municipal securities			40,201	—			40,201			—
	Interest rate swap derivatives			2,603	—			2,603			—
	Liabilities:
	Interest rate swap derivatives			2,496	—			2,496			—
	Assets and liabilities measured at fair value on a non-recurring basis are summarized below.
					Fair value measurements using
							Significant
					Quoted prices in		other		Significant
					active markets for		observable		unobservable
			Carrying		identical assets		inputs		inputs
			value		(Level 1)		(Level 2)		(Level 3)
	at December 31, 2014
	Assets:
	Impaired loans
	Residential real estate		$	2,971	—		—		$	2,971
	Commercial real estate			4,854	—		—			4,854
	Land, land development and construction			1,731	—		—			1,731
	Commercial			167	—		—			167
	Consumer			102	—		—			102
	Other real estate owned
	Residential real estate			448	—		—			448
	Commercial real estate			2,363	—		—			2,363
	Land, land development and construction			2,240	—		—			2,240
	Bank property held for sale			2,675	—		—			2,675
	at December 31, 2013
	Assets:
	Impaired loans
	Residential real estate		$	3,191	—		—		$	3,191
	Commercial real estate			7,515	—		—			7,515
	Land, land development and construction			290	—		—			290
	Commercial			731	—		—			731
	Consumer			157	—		—			157
Other real estate owned
Residential real estate			27	—		—			27
Commercial real estate			3,837	—		—			3,837
Land, land development and construction			3,949	—		—			3,949
Bank property held for sale			1,582	—		—			1,582
Impaired loans with specific valuation allowances had a recorded investment of $10,677 with a valuation allowance of $852 at December 31, 2014, and a recorded investment of 13,528, with a valuation allowance of $1,644, at December 31, 2013.  The Company recorded a provision for loan loss expense of $554 and $1,895 on these loans during the years ending 2014 and 2013, respectively.
Other real estate owned had a decline in fair value of $3,250 and $6,012 during the twelve month periods ending December 31, 2014 and 2013, respectively.  Changes in fair value were recorded directly as an adjustment to current earnings through non interest expense.
Bank property held for sale represents certain branch office buildings which the Company has closed and consolidated with other existing branches. The real estate was transferred out of the Bank Premises and Equipment category into bank property held for sale. The real estate was transferred at the lower of amortized cost or fair value less estimated costs to sell. The fair values were based upon comparative sales data provided by real estate brokers. The real estate was transferred at the lower of amortized cost or fair value less estimated costs to sell.  The Company closed eight bank branch offices during the year 2014, seven owned by the Company and one leased.  Five of the properties owned by the Company were transferred to held for sale, the remaining two are being used as loan production offices, back office support staff offices and a portion of the second floor of one of the buildings is leased to an existing tenant.  Six of the properties transferred to held for sale were sold resulting in a recovery of $649 from a previous impairment charge of $1,753 recorded during the current year.  Excluding the properties sold in 2014, the Company recognized an impairment charge of $1,152 during the twelve month period ending December 31, 2014 related to the transfer to held for sale.
Fair Value of Financial Instruments
The methods and assumptions, not previously presented, used to estimate fair value are described as follows:
Cash and Cash Equivalents:  The carrying amounts of cash and cash equivalents approximate fair values and are classified as Level 1.
FHLB and FRB Stock:  It is not practical to determine the fair value of FHLB and FRB stock due to restrictions placed on their transferability.
Investment securities held to maturity:  The fair values of securities held to maturity are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1 inputs) or matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs).
Loans held for sale:  The fair value of loans held for sale is estimated based upon binding contracts from third party investors resulting in a Level 2 classification.
Loans, net: Fair values of loans, excluding loans held for sale, are estimated as follows: For variable rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values resulting in a Level 3 classification. Fair values for other loans are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality resulting in a Level 3 classification. Impaired loans are valued as described previously. The methods utilized to estimate the fair value of loans do not necessarily represent an exit price.
FDIC Indemnification Asset:  It is not practical to determine the fair value of the FDIC indemnification asset due to restrictions placed on its transferability.
Accrued Interest Receivable:  The carrying amount of accrued interest receivable approximates fair value and is classified as Level 3.
Deposits:  The fair values disclosed for demand deposits (e.g., interest and non-interest checking, savings, and money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amount) resulting in Level 1 classification.  Fair values for fixed rate certificates of deposit are estimated using a discounted cash flows calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits resulting in a Level 2 classification.
Short-term Borrowings:  The carrying amounts of federal funds purchased, borrowings under repurchase agreements, and other short-term borrowings (note payable), generally maturing within ninety days, approximate their fair values resulting in a Level 2 classification.
Corporate Debentures:  The fair values of the Company’s corporate debentures are estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements resulting in a Level 3 classification.
Accrued Interest Payable:  The carrying amount of accrued interest payable approximates fair value resulting in a Level 2 classification.
Off-balance Sheet Instruments:  The fair value of off-balance-sheet items is not considered material.
The following table presents the carry amounts and estimated fair values of the Company’s financial instruments:
				Fair value measurements
at December 31, 2014		Carrying amount		Level 1				Level 2			Level 3		Total
Financial assets:
Cash and cash equivalents		$	158,413	$	158,413			$	—		$	—	$	158,413
Trading securities			3,420	—					3,420		—			3,420
Investment securities available for sale			517,457	—					517,457		—			517,457
Investment securities held to maturity			237,362	—					238,431		—			238,431
FHLB and FRB stock			14,219	—					-		—		n/a
Loans held for sale			1,251	—					1,251		—			1,251
Loans, less allowance for loan losses of $19,898			2,409,627	—				—				2,418,405		2,418,405
FDIC indemnification asset			49,054	—				—			—		n/a
Interest rate swap derivatives			6,800	—					6,800		—			6,800
Accrued interest receivable			8,999	—				—				8,999		8,999
Financial liabilities:
Deposits- without stated maturities		$	2,604,228	$	2,604,228			$	—		$	—	$	2,604,228
Deposits- with stated maturities			487,812	—					491,999		—			491,999
Securities sold under agreement to repurchase			27,022	—					27,022		—			27,022
Federal funds purchased			151,992	—					151,992		—			151,992
Corporate debentures			23,917	—					-			19,722		19,722
Interest rate swap derivatives			7,575	—					7,575		—			7,575
Accrued interest payable			336	—					336		—			336
				Fair value measurements
at December 31, 2013		Carrying amount		Level 1				Level 2			Level 3		Total
Financial assets:
Cash and cash equivalents		$	174,889	$	174,889			$	—		$	—	$	174,889
Investment securities available for sale			457,086	—					457,086		—			457,086
FHLB and FRB stock			8,189	—				—			—		n/a
Loans held for sale			1,010	—					1,010		—			1,010
Loans, less allowance for loan losses of $20,454			1,453,725	—				—				1,456,295		1,456,295
FDIC indemnification asset			73,877	—				—			—		n/a
Interest rate swap derivatives			2,603	—					2,603		—			2,603
Accrued interest receivable			6,337	—				—				6,337		6,337
Financial liabilities:
Deposits- without stated maturities		$	1,671,356	$	1,671,356			$	—		$	—	$	1,671,356
Deposits- with stated maturities			384,875	—					389,115		—			389,115
Securities sold under agreement to repurchase			20,457	—					20,457		—			20,457
Federal funds purchased			29,909	—					29,909		—			29,909
Corporate debentures			16,996	—				—				11,091		11,091
Interest rate swap derivatives			2,496	—					2,496		—			2,496

Bank_Premises_and_Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Bank Premises and Equipment	-8	Bank Premises and Equipment
	A summary of bank premises and equipment as of December 31, 2014 and 2013 is as follows:
			December 31,
			2014		2013
	Land		$	34,387	$	32,591
	Land improvements			949		864
	Buildings			60,168		56,651
	Leasehold improvements			3,520		2,450
	Furniture, fixtures and equipment			30,906		26,749
	Construction in progress			1,587		5,828
				131,517		125,133
	Less: Accumulated depreciation			32,669		28,514
			$	98,848	$	96,619
	The Company leases land and certain facilities under noncancellable operating leases.  The following is a schedule of future minimum annual rentals under the noncancellable operating leases:
	Year ending December 31,
	2015		$	2,318
	2016			1,891
	2017			1,690
	2018			1,540
	2019			1,012
	Thereafter			4,929
			$	13,380
	Rent expense, net of rental income, for the years ended December 31, 2014, 2013 and 2012, was $2,309, $1,099 and $1,455, respectively, and is included in occupancy expense in the accompanying Consolidated Statements of Operations.  Rental income for the years ended December 31, 2014, 2013, and 2012, was $632, $540, and $507, respectively, and is included in occupancy expense.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	-9	Goodwill and Intangible Assets
	Goodwill was a result of whole bank acquisitions, all within the Company’s commercial and retail banking segment.  The change in balance for goodwill during the years 2014, 2013 and 2012 is as follows:
			2014			2013			2012
	Beginning of year		$	44,924		$	44,924		$	38,035
	Acquired goodwill			31,815			—			6,889
	Impairment			—			—			—
	End of year		$	76,739		$	44,924		$	44,924
	The Company performed a step 1 annual impairment analysis of the goodwill recorded at the commercial and retail banking (“Bank”) reporting unit as of November 30, 2014.  Step 1 includes the determination of the carrying value of the reporting unit, including the existing goodwill and intangible assets, and estimating the fair value of the reporting unit.  The carrying amount of the reporting unit did not exceed its fair value resulting in no impairment.
	Acquired intangible assets consists of core deposit intangibles (“CDI”) and Trust intangible (“Trust”) which are intangible assets arising from either whole bank or branch acquisitions.  They are initially measured at fair value and then amortized over a ten-year period on an accelerated basis using the projected decay rates of the underlying core deposits in the case of CDI and an accelerated method in the case of the Trust intangible.  The change in balance for CDI and the Trust during the years 2014, 2013 and 2012 is as follows:
			2014			2013			2012
	Beginning of year		$	6,116		$	7,307		$	5,203
	Acquired CDI			11,569			—			1,896
	Acquired Trust			—			—			1,580
	Amortization expense			(2,284	)		(1,191	)		(1,372	)
	Impairment expense			—			—			—
	End of year		$	15,401		$	6,116		$	7,307
	Acquired intangible assets were as follows for years ended December 31, 2014 and 2013:
			December 31, 2014						December 31, 2013
			Gross						Gross
			Carrying			Accumulated			Carrying			Accumulated
			Amount			Amortization			Amount			Amortization
	Amortized intangible assets:
	Core deposit intangibles		$	23,176		$	8,760		$	11,607		$	6,649
	Trust intangible			1,580			595			1,580			422
	Total acquired intangibles		$	24,756		$	9,355		$	13,187		$	7,071
	Estimated amortization expense for each of the next five years:
	2015		$	2,529
	2016			2,269
	2017			1,876
	2018			1,724
	2019			1,669

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Banking And Thrift [Abstract]
Deposits	-10	Deposits
	A detail of deposits at December 31, 2014 and 2013 is as follows:
			December 31,
					Weighted				Weighted
					Average				Average
					Interest				Interest
				2014	Rate			2013	Rate
	Non-interest bearing deposits		$	1,048,874	—	%	$	644,915	—	%
	Interest bearing deposits:
	Interest bearing demand deposits			607,359	0.1	%		483,842	0.1	%
	Savings deposits			231,039	0.1	%		232,942	0.1	%
	Money market accounts			716,956	0.3	%		309,657	0.2	%
	Time deposits less than $100,000			219,021	0.8	%		181,635	0.8	%
	Time deposits of $100,000 or greater			268,791	1.1	%		203,240	1.2	%
			$	3,092,040	0.2	%	$	2,056,231	0.2	%
	The following table presents the amount of certificate accounts at December 31, 2014, maturing during the periods reflected below:
	Year		Amount
	2015		$	320,629
	2016			91,988
	2017			35,948
	2018			17,902
	2019			21,344
	Thereafter			1
	Total		$	487,812
	Time deposits that meet or exceed the FDIC insurance limit of $250 at year end 2014 and 2013 were $116,861 and $83,335.

Securities_Sold_Under_Agreemen

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2014
Banking And Thrift [Abstract]
Securities Sold Under Agreements to Repurchase	-11	Securities Sold Under Agreements to Repurchase
	The Company’s subsidiary bank enters into borrowing arrangements with its retail business customers by agreements to repurchase (“repurchase agreements”) under which the bank pledges investment securities owned and under its control as collateral against the one-day borrowing arrangement.
	At December 31, 2014 and 2013, the Company had $27,022 and $20,457 in repurchase agreements.  Repurchase agreements are secured by U.S. treasury securities and obligations of U.S. government agencies and government sponsored enterprises with fair values of $52,714 and $37,845 at December 31, 2014 and 2013, respectively.
	Information concerning repurchase agreements is summarized as follows:
			2014			2013			2012
	Average daily balance during the year		$	30,289		$	21,693		$	21,388
	Average interest rate during the year			0.6	%		0.36	%		0.4	%
	Maximum month-end balance during the year		$	34,681		$	24,483		$	24,989
	Weighted average interest rate at year end			0.72	%		0.4	%		0.4	%

Federal_Funds_Purchased

Federal Funds Purchased	12 Months Ended
	Dec. 31, 2014
Banking And Thrift [Abstract]
Federal Funds Purchased	-12	Federal Funds Purchased
	Federal funds purchased, as listed below, are overnight deposits from correspondent banks.  Information concerning these deposits is summarized as follows:
			2014			2013			2012
	Average daily balance during the year		$	49,899		$	37,958		$	53,803
	Average interest rate during the period			0.1	%		0.05	%		0.05	%
	Maximum month-end balance during the year		$	151,992		$	53,274		$	82,473
	Weighted average interest rate at year end			0.29	%		0.05	%		0.05	%

Federal_Home_Loan_Bank_Advance

Federal Home Loan Bank Advances and Other Borrowed Funds	12 Months Ended
	Dec. 31, 2014
Banking And Thrift [Abstract]
Federal Home Loan Bank Advances and Other Borrowed Funds	-13	Federal Home Loan Bank advances and other borrowed funds
	From time to time, the Company borrows either through Federal Home Loan Bank advances or Federal Funds Purchased, other than correspondent bank deposits listed in note 12 above.  The Company had no advances from the Federal Home Loan Bank during the periods ending December 31, 2014 and 2013.
	Advances are collateralized by residential and commercial loans under a blanket lien arrangement and based on this collateral, and the Company’s holdings of FHLB stock, the Company is eligible to borrow up to $187,195 at year end 2014.

Corporate_Debenture

Corporate Debenture	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Corporate Debenture	-14	Corporate Debenture
	In September 2003, the Company formed CenterState Banks of Florida Statutory Trust I (the “Trust”) for the purpose of issuing trust preferred securities. On September 22, 2003, the Company issued a floating rate corporate debenture in the amount of $10,000.  The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture.  The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 305 basis points).   The corporate debenture and the trust preferred security each have 30-year lives.  The trust preferred security and the corporate debenture are callable by the Company or the Trust, at their respective option after five years, and sooner in specific events, subject to prior approval by the Federal Reserve, if then required.  The Company has treated the corporate debenture as Tier 1 capital up to the maximum amount allowed under the Federal Reserve guidelines for federal regulatory purposes.  The Company is not considered the primary beneficiary of this Trust (variable interest entity), therefore the trust is not consolidated in the Company’s financial statements, but rather the subordinated debentures are shown as a liability.  The Company’s investment in the common stock of the trust was $310 and is included in other assets.
	In September 2004, Valrico Bancorp Inc. (“VBI”) formed Valrico Capital Statutory Trust (“Valrico Trust”) for the purpose of issuing trust preferred securities. On September 9, 2004, VBI issued a floating rate corporate debenture in the amount of $2,500.  The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture.  On April 2, 2007, the Company acquired all the assets and assumed all the liabilities of VBI pursuant to the merger agreement, including VBI’s corporate debenture and related trust preferred security discussed above.  The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 270 basis points).   The corporate debenture and the trust preferred security each have 30-year lives.  The trust preferred security and the corporate debenture are callable by the Company or the Valrico Trust, at their respective option after five years, and sooner in specific events, subject to prior approval by the Federal Reserve, if then required.    The Company has treated the corporate debenture as Tier 1 capital up to the maximum amount allowed under the Federal Reserve guidelines for federal regulatory purposes.  The Company is not considered the primary beneficiary of this Trust (variable interest entity), therefore the trust is not consolidated in the Company’s financial statements, but rather the subordinated debentures are shown as a liability.  The Company’s investment in the common stock of the trust was $77 and is included in other assets.
	In September 2003, Federal Trust Corporation (“FTC”) formed Federal Trust Statutory I (“FTC Trust”) for the purpose of issuing trust preferred securities. On September 17, 2003, FTC issued a floating rate corporate debenture in the amount of $5,000.  The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture.  In November 2011, the Company acquired certain assets and assumed certain liabilities of FTC from The Hartford Financial Services Group, Inc. (“Hartford”) pursuant to an acquisition agreement, including FTC’s corporate debenture and related trust preferred security issued through FTC’s finance subsidiary FTC Trust.  The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 295 basis points).   The corporate debenture and the trust preferred security each have 30-year lives maturing in 2033.  The trust preferred security and the corporate debenture are callable by the Company or the FTC Trust, at their respective option after five years, and sooner in specific events, subject to prior approval by the Federal Reserve, if then required.  The Company has treated the corporate debenture as Tier 1 capital up to the maximum amount allowed under the Federal Reserve guidelines for federal regulatory purposes.  The Company is not considered the primary beneficiary of this Trust (variable interest entity), therefore the trust is not consolidated in the Company’s financial statements, but rather the subordinated debentures are shown as a liability.  The Company’s investment in the common stock of the trust was $155 and is included in other assets.
	In January 2005, Gulfstream Bancshares, Inc. (“GBI”) formed Gulfstream Bancshares Capital Trust I (“GBI Trust I”) for the purpose of issuing trust preferred securities. On January 18, 2005, GBI issued a floating rate corporate debenture in the amount of $7,000. The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture. The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 190 bps). The rate is subject to change quarterly. The corporate debenture and the trust preferred security each have 30-year lives. The trust preferred security and the corporate debenture are callable by the Company or the GBI Trust I, at their respective option, subject to prior approval by the Federal Reserve, if then required. On January 17, 2014, the Company acquired all the assets and assumed all the liabilities of GBI by merger, including GBI’s corporate debenture and related trust preferred security discussed above. The Company has treated the corporate debenture as Tier 1 capital up to the maximum amount allowed under the Federal Reserve guidelines for federal regulatory purposes.
	In March 2007, GBI formed Gulfstream Bancshares Capital Trust II (“GBI Trust II”) for the purpose of issuing trust preferred securities. On March 6, 2007, GBI issued a floating rate corporate debenture in the amount of $3,000. The Trust used the proceeds from the issuance of a trust preferred security to acquire the corporate debenture. The trust preferred security essentially mirrors the corporate debenture, carrying a cumulative preferred dividend at a variable rate equal to the interest rate on the corporate debenture (three month LIBOR plus 170 bps). The rate is subject to change quarterly. The corporate debenture and the trust preferred security each have 30-year lives. The trust preferred security and the corporate debenture are callable by the Company or the GBI Trust II, at their respective option, subject to prior approval by the Federal Reserve, if then required. On January 17, 2014, the Company acquired all the assets and assumed all the liabilities of GBI by merger, including GBI’s corporate debenture and related trust preferred security discussed above. The Company has treated the corporate debenture as Tier 1 capital up to the maximum amount allowed under the Federal Reserve guidelines for federal regulatory purposes.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	-15	Income Taxes
	Allocation of federal and state income tax expense between current and deferred portions for the years ended December 31, 2014, 2013 and 2012, is as follows:
			Current						Deferred		Total
	December 31, 2014:
	Federal		$	4,384			$	1,486			$	5,870
	State			1,009				247				1,256
			$	5,393			$	1,733			$	7,126
	December 31, 2013:
	Federal		$	4,423			$	27			$	4,450
	State			1,055			5					1,060
			$	5,478			$	32			$	5,510
	December 31, 2012:
	Federal		$	(32	)		$	3,761			$	3,729
	State		271						625			896
			$	239			$	4,386			$	4,625
	The tax effect of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2014 and 2013, are presented below:
		December 31,
		2014				2013
	Deferred tax assets:
	Allowance for loan losses	$	7,675			$	7,890
	Stock based compensation		771				469
	Deferred compensation		2,425				2,598
	Impairment expenses		463				403
	Net operating loss carryforward		20,308			—
	Other real estate owned expenses		2,391				3,074
	Fair value adjustments		18,386			—
	Nonaccrual interest		2,579				560
	Unrealized loss on investment securities available for sale	—					2,816
	Other		75				1,007
	Total deferred tax assets		55,073				18,817
	Deferred tax liabilities:
	Premises and equipment, due to differences in
	depreciation methods and useful lives		(2,264	)			(4,096	)
	Deferred loan costs, net		(358	)			(156	)
	Fair value adjustments	—					(8,937	)
	Like kind exchange		(300	)			(300	)
	Unrealized gain on investment securities available for sale		(2,548	)		—
	Accretion of discounts on investments		(16	)			(32	)
	Total deferred tax liabilities		(5,486	)			(13,521	)
	Net deferred tax asset	$	49,587			$	5,296
	As a result of the acquisition of FSB on June 1, 2014, the Company obtained net operating loss carryforwards of approximately $57,375 which are subject to Internal Revenue Code Section 382 limitation of approximately $6,487 per year.  At December 31, 2014, the Company had net operating carryforwards of approximately $52,645 which will begin to expire as follows.
	2029	$	2,105
	2030		27,889
	2031		10,463
	2032		2,028
	2033		4,027
	2034		6,133
		$	52,645
	In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized.  In performing this analysis, the Company considers all evidence currently available, both positive and negative, in determining whether based on the weight of that evidence, it is more likely than not the deferred tax asset will be realized.
	The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax of the states of Florida, Georgia, Alabama, Colorado, North Carolina, and Tennessee.  The Company is no longer subject to examination by taxing authorities for the years before 2011.  The Company was not subject to any material interest or penalties on its income tax liabilities for the years 2012, 2013 and 2014.
	A reconciliation between the actual tax expense and the “expected” tax expense, computed by applying the U.S. federal corporate rate of 35 percent (34 percent for 2012) is as follows:
			December 31,
			2014				2013			2012
	“Expected” tax (benefit) expense		$	7,032			$	6,214		$	4,940
	Tax exempt interest, net			(910	)			(907	)		(925	)
	Bank owned life insurance			(549	)			(391	)		(412	)
	State income taxes, net of federal income tax benefits			817				689			591
	Stock based compensation			83				100			104
	Merger and acquisition related expenses			536				68			259
	Other, net			117				(263	)		68
			$	7,126			$	5,510		$	4,625

RelatedParty_Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related-Party Transactions	-16	Related-Party Transactions
	Loans to principal officers, directors, and their affiliates during 2014 and 2013 were as follows:
			2014			2013
	Beginning balance		$	3,261		$	3,957
	New loans			4,135			2,354
	Effect of changes in composition of related parties			—			—
	Repayments			(1,816	)		(3,050	)
	Ending balance		$	5,580		$	3,261
	At December 31, 2014 and 2013 principal officers, directors, and their affiliates had $2,671 and $2,057, respectively, of available lines of credit.  Deposits from principal officers, directors, and their affiliates at year-end 2014 and 2013 were approximately $29,746 and $12,694, respectively.

Regulatory_Capital_Matters

Regulatory Capital Matters

12 Months Ended

Dec. 31, 2014

Banking And Thrift [Abstract]

Regulatory Capital Matters

-17

Regulatory Capital Matters

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies.  Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements.  Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices.  The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total and Tier I capital (as defined in the regulations) to risk-weighted assets.  Management believes, as of December 31, 2014, that the Company and the Bank meet all capital adequacy requirements to which they are subject.

As of December 31, 2014 and 2013, the most recent notifications from the Office of Comptroller of the Currency (“OCC”) and the FDIC categorized the Bank as well capitalized under the regulatory framework for prompt corrective action.  To be categorized as well capitalized, the Bank must maintain total risk-based, Tier I risk-based and Tier I leverage ratios as set forth in the table.  There are no conditions or events since that notification that management believes have changed the institution’s category.  The Company’s subsidiary bank has agreed with its primary regulator, OCC, to maintain a Tier 1 leverage ratio of at least 8%.

A summary of actual, required, and capital levels necessary for capital adequacy purposes for the Company as of December 31, 2014 and 2013, are presented in the table below.  There is no threshold for “well-capitalized” status for bank holding companies.

To be well

capitalized under

For capital

Prompt corrective

Actual

Adequacy purposes

action provision

Amount

Ratio

Amount

Ratio

Amount

Ratio

31-Dec-14

Total capital (to risk weighted assets)

$

384,162

15.10%

$

202,946

>8%

n/a

n/a

Tier 1 capital (to risk weighted assets)

364,264

14.40%

101,473

>4%

n/a

n/a

Tier 1 capital (to average assets)

364,264

10.10%

144,051

>4%

n/a

n/a

31-Dec-13

Total capital (to risk weighted assets)

$

262,701

17.90%

$

117,450

>8%

n/a

n/a

Tier 1 capital (to risk weighted assets)

244,323

16.60%

58,725

>4%

n/a

n/a

Tier 1 capital (to average assets)

244,323

10.40%

94,182

>4%

n/a

n/a

A summary of actual, required, and capital levels necessary for capital adequacy purposes in the case of the Company’s subsidiary bank as of December 31, 2014 and 2013, are presented in the table below.

To be well

capitalized under

For capital

Prompt corrective

Actual

Adequacy purposes

action provision

Amount

Ratio

Amount

Ratio

Amount

Ratio

31-Dec-14

Total capital (to risk weighted assets)

$

360,278

14.20%

$

203,268

>8%

$

254,085

>10%

Tier 1 capital (to risk weighted assets)

340,389

13.40%

101,634

>4%

152,451

>6%

Tier 1 capital (to average assets)

340,389

9.40%

144,185

>4%

180,231

>5%

31-Dec-13

Total capital (to risk weighted assets)

$

213,744

14.60%

$

117,021

>8%

$

146,277

>10%

Tier 1 capital (to risk weighted assets)

195,434

13.40%

58,511

>4%

87,766

>6%

Tier 1 capital (to average assets)

195,434

8.30%

93,955

>4%

117,444

>5%

Dividends

Dividends	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Dividends	-18	Dividends
	The Company declared and paid cash dividends on its common stock of $1,709, $1,204 and $1,203 during the years ended December 31, 2014, 2013 and 2012, respectively.  Banking regulations limit the amount of dividends that may be paid by the subsidiary banks to the Company without prior approval of the Bank’s regulatory agency.  In November 2013, the Company received a $34,000 dividend from its subsidiary bank.  At December 31, 2014, there was no additional capacity available to pay additional dividends from the subsidiary bank to the Company, without prior approval of the Bank’s regulatory agency.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	-19	Stock-Based Compensation
	The Company assumed the obligations of GBI under the Gulfstream 2009 Stock Option Plan, the Gulfstream Officers’ and Employees’ Stock Option Plan and the Gulfstream Directors’ Stock Option Plan (collectively, the “Gulfstream Plans”) pursuant to the closing on January 17, 2014 by CenterState of the merger of Gulfstream with and into CenterState pursuant to an Agreement and Plan of Merger dated July 29, 2013, as amended, by and between Gulfstream and CenterState.  All of the Gulfstream stock options awarded pursuant to the Gulfstream Plans outstanding at the merger closing date were converted to stock options for 774,104 of the Company’s common shares with an average exercise price of $6.99 per share.  At December 31, 2014 there were options outstanding for 419,184 shares of the Company’s common stock with an average exercise price of $7.16 per share and an average remaining contractual life of approximately 5 years.
	On April 25, 2013, the Company’s shareholders approved the CenterState Banks, Inc. 2013 Equity Incentive Plan (the “2013 Plan”).  The 2013 Plan replaces the 2007 Plan discussed below.  The 2013 Plan authorizes the issuance of up to 1,600,000 shares through the 2023 expiration of the plan.  Of this amount 1,525,000 shares are allocated to employees, all of which may be issued as incentive stock options, and 75,000 shares are allocated to directors.  The Company’s Board of Directors approved freezing the Company’s current 2007 Equity Incentive Plan whereby no additional future grants and/or awards will be awarded pursuant to that plan effective with the shareholder approval of the 2013 Plan.  During 2014 the Company did not grant any incentive stock options to its employees.  The Company awarded 492,114 shares of Restricted Stock (“RSAs”) during 2014 with an average fair value of $10.55 per share at the date of grant.  These restricted stock awards vest over periods ranging from two to ten years.  In addition to RSAs, the Company also awarded Performance Share Units (“PSUs”) during 2014.  The PSUs will cliff vest on December 31, 2017.  The units may be converted into common shares based on the Company’s Total Shareholder Return compared to its peer group pursuant to the Company’s Long-Term Incentive Plan as described in the Company’s 2015 Proxy Statement.  The range of shares that may vest in the future is a minimum of 0 and a maximum of 163,871 with an expected target of 109,247 shares.  At December 31, 2014, there were a total of 886,911 shares available for future grants pursuant to the 2013 Plan, assuming maximum future vesting of PSUs outstanding.
	On April 24, 2007, the Company’s shareholders approved the CenterState 2007 Equity Incentive Plan (the “2007 Plan”) and approved an amendment to the 2007 Plan on April 28, 2009.  The 2007 Plan, as amended, replaced the 1999 Plan discussed below.  The 2007 Plan, as amended, authorize the issuance of up to 1,350,000 shares of the Company stock.  In 2013 the 2007 Plan was frozen whereby no additional grants and/or awards were awarded pursuant to this plan subsequent to April 2013.
	In 1999, the Company authorized 730,000 common shares for employees of the Company under an incentive stock option and non-statutory stock option plan (the “1999 Plan”). There were no stock options granted pursuant to the 1999 Plan subsequent to December 31, 2006.  The 2007 Plan, discussed above, replaced the 1999 Plan.
	The Company also assumed and converted the stock option plans of its prior subsidiary banks consistent with the terms and conditions of their respective merger agreements.  These options are all vested and exercisable.  At December 31, 2014, they represented exercisable options for 3,170 shares of the Company’s common stock with an average exercise price of $12.62 per share.
	The Company’s stock-based compensation consists of stock options, RSAs and PSUs.  During the twelve month period ended December 31, 2014, 2013 and 2012, the Company recognized total stock-based compensation expense as listed in the table below.
			2014			2013				2012
	Stock option expense		$	238		$	292			$	363
	RSA expense			1,264			317				268
	PSU expense			75			—				—
	Total stock-based compensation expense		$	1,577		$	609			$	631
	There is no income tax benefit provided for in the Company’s tax provision for qualified incentive stock options.  The Company receives a tax benefit when a non qualified stock option is exercised.  The total income tax benefit related to the exercise of non qualified stock options was approximately $350, $0 and $0 during the twelve month periods ending December 31, 2014, 2013 and 2012, respectively.  The Company provided an income tax benefit in its tax provision for RSA and PSU expenses of approximately $517, $122 and $101 during the twelve month periods ending December 31, 2014, 2013 and 2012, respectively.
	As of December 31, 2014, the total remaining unrecognized compensation cost related to non-vested stock options, net of estimated forfeitures, was approximately $607 and will be recognized over the next 8 years.   The weighted average period over which this expense is expected to be recognized is approximately 2.2 years.
	As of December 31, 2014, the total remaining unrecognized compensation cost related to non-vested RSAs, net of estimated forfeitures, was approximately $5,624 and will be recognized over the next 10 years.   The weighted average period over which this expense is expected to be recognized is approximately 2.8 years.
	As of December 31, 2014, the total remaining unrecognized compensation cost related to non-vested PSUs, net of estimated forfeitures, was approximately $905 and will be recognized over the next 3 years.   The weighted average period over which this expense is expected to be recognized is approximately 2.0 years.
	The Company granted stock options for 3,000 and 57,500 shares of common stock during the twelve month periods ending December 31, 2013 and 2012, respectively.  The Company did not grant any stock options during 2014.  However, pursuant to the Company’s agreement to acquire Gulfstream, the Company converted all outstanding Gulfstream stock options into CenterState options for 774,104 shares of common stock on the January 17, 2014 acquisition date.  The estimated fair value of options granted, or acquired in the case of Gulfstream, during these periods were calculated as of the grant date, or the acquisition date in the case of Gulfstream, using the Black-Scholes option-pricing model.  The weighted-average assumptions as of the grant date are as follows:
			2014			2013				2012
	Expected option life			0.5 years			7.7 years				7.7 years
	Risk-free interest rate			0.07	%		1.91	%			1.08	%
	Expected volatility			0.01	%		44.5	%			44.3	%
	Dividend yield			0	%		0.39	%			0.62	%
	The Company determined the expected life of the stock options using the simplified method approach allowed for plain-vanilla share options as described in SAB 107.  The risk-free interest rate is based on the U.S. Treasury yield curve in effect as of the grant date.  Expected volatility was determined using historical volatility.
	ASC 718 requires the recognition of stock-based compensation for the number of awards that are ultimately expected to vest.  As a result, for most awards, recognized stock compensation is reduced for estimated forfeitures prior to vesting.  Estimated forfeitures will be reassessed in subsequent periods and may change based on new facts and circumstances.
	The weighted-average estimated fair value of stock options granted, or acquired in the case of Gulfstream, during the twelve month periods ended December 31, 2014, 2013 and 2012 was $4.67 per share, $4.91 per share and $3.09 per share respectively.   The table below present’s information related to stock option activity for the years ended December 31, 2014, 2013 and 2012:
			2014			2013				2012
	Total intrinsic value of stock options exercised		$	1,114		$	2			$	—
	Cash received from stock options exercised		$	1,129			—				—
	Gross income tax benefit from the exercise of stock options		$	350			—				—
	A summary of stock option activity for the years ended December 31, 2014, 2013 and 2012 is as follows:
			December 31, 2014							December 31, 2013							December 31, 2012
						Weighted-								Weighted-						Weighted-
						Average								Average						Average
			Number of			Exercise				Number of				Exercise			Number of			Exercise
			Options			Price				Options				Price			Options			Price
	Outstanding, beginning of period			1,073,716		$	13.83				1,158,646			$	13.64			1,128,304		$	14.03
	Granted			—			—				3,000			$	10.22			57,500		$	6.87
	Issued Gulfstream (note 1)			774,104		$	6.99				—				—			—			—
	Exercised			(233,762	)	$	6.09				(1,714	)		$	8.9			—			—
	Forfeited			(475,654	)	$	12.73				(86,216	)		$	11.22			(27,158	)	$	15.33
	Outstanding, end of period			1,138,404		$	11.23				1,073,716			$	13.83			1,158,646		$	13.64
	note 1:	Pursuant to the Company’s agreement to acquire Gulfstream in January 2014, all outstanding Gulfstream stock options were converted to CenterState stock options as of the acquisition date.
								Weighted-				Weighted-
								Average				Average				Aggregate
				Number of				Exercise						Contractual		Intrinsic
				Options				Price						Term		Value
	Options outstanding, December 31, 2014				1,138,404			$	11.23				4.2 years			$	2,558
	Options fully vested and expected to vest, December 31, 2014				1,099,700			$	11.21				4.2 years			$	2,499
	Options exercisable, December 31, 2014				864,249			$	10.92				4.1 years			$	2,180
	At December 31, 2014 there were restricted stock awards (“RSAs”) for 659,670 shares of the Company’s common stock outstanding and not vested.  Of this amount 249,542 restricted shares have been issued and included in the Company’s total common stock outstanding, but have not vested as of December 31, 2014.  The remaining 410,128 represent common shares to be issued at the end of their respective vesting period.  A summary of the RSA activity for the years ended December 31, 2014, 2013 and 2012 is presented in the table below.
			2014														2013					2012
				Number			Number
				of RSAs			of RSAs								Weighted						Weighted					Weighted
				underlying			underlying				Total				average						average					average
				shares not			shares				number				fair value at			Number			fair value at		Number		fair value at
			issued			issued				of RSAs				grant date			of RSAs			grant date		of RSAs			grant date
	Outstanding, beginning period			240,341			—				240,341			$	9.76			209,384		$	9.62		179,152		$	10.53
	Granted			241,739			250,375				492,114			$	10.55			59,500		$	10.22		54,500		$	6.87
	Vested			(35,753	)		(833	)			(36,586	)		$	9.77			(28,543	)	$	9.66		(24,268	)	$	10.19
	Forfeited			(36,199	)		—				(36,199	)		$	10.79			—			—		—			—
	Outstanding, end of period			410,128			249,542				659,670			$	10.3			240,341		$	9.76		209,384		$	9.62
	In September 2014 the Company initiated a Long-Term Incentive Plan that includes a Performance Share Unit (“PSU”) award that could be awarded in PSUs, which can eventually be converted to common stock, based on the Company’s relative Total Shareholder Return as compared to a peer group of similar companies selected by the Company’s Compensation Committee over a 39 month period beginning on September 18, 2014 and ending on December 31, 2017.  The Company expects to recognize an expense of $980 over the 39 month period ending December 31, 2017.  The expense recognized during 2014 was $75.

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	-20	Employee Benefit Plan
	Substantially all of the Company’s employees are covered under its 401(k) defined contribution retirement plan.  Employees are eligible to participate in the plan after completing six months of continuous employment.  The Company contributes an amount equal to a certain percentage of the employees’ contributions based on the discretion of the Board of Directors.  In addition, the Company may also make additional contributions to the plan each year, subject to profitability and other factors, and based solely on the discretion of the Board of Directors.  For the years ended December 31, 2014, 2013 and 2012, the Company’s contributions to the plan were $1,398, $1,219 and $1,144, respectively, which are included in salary and benefits on the Consolidated Statements of Operations.
	In 2008, the Company entered into a salary continuation agreement with its chief executive officer.  Five additional Company executive officers entered into salary continuation agreements during 2010.  In 2007, an additional four pre-existing salary continuation agreements with certain Valrico State Bank’s executive officers were assumed as part of the acquisition.  The plans are nonqualified deferred compensation arrangements that are designed to provide supplemental retirement income benefits to participants.  The Company expensed $580, $569 and $501 for the accrual of future salary continuation benefits in 2014, 2013 and 2012, respectively.  Other liabilities included salary continuation benefits payable of $3,621, $3,143 and $2,597 at December 31, 2014, 2013 and 2012, respectively.
	In 2007, the Company entered into deferred compensation arrangements, through Rabbi Trust agreements, with two Valrico State Bank’s executive officers pursuant to the acquisition.  The Rabbi Trust asset is included in other assets, and the related deferred compensation payable is included in other liabilities.  The Rabbi Trust asset and the related deferred compensation payable at December 31, 2014, 2013, and 2012 were $1,484, $1,355 and $1,158, respectively.  Earnings from the Rabbi Trust increase the asset and increase the deferred compensation payable.  Losses from the Rabbi Trust decrease the asset and decrease the deferred compensation payable.  There is no net income statement effect other than the administration expenses of the Trust which approximates $5 per year.

Parent_Company_Only_Financial_

Parent Company Only Financial Statements	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Parent Company Only Financial Statements	-21	Parent Company Only Financial Statements
	Condensed financial statements of CenterState Banks, Inc. (parent company only) follow:
	Condensed Balance Sheet
	December 31, 2014 and 2013
	Assets:		2014			2013
	Cash and due from banks		$	2,808		$	966
	Inter-company receivable from bank subsidiary			27,000			45,703
	Investment in wholly-owned bank subsidiary			441,710			241,990
	Investment in other wholly-owned subsidiary			1,381			2,322
	Prepaid expenses and other assets			9,782			3,995
	Total assets		$	482,681		$	294,976
	Liabilities:
	Accounts payable and accrued expenses		$	6,287		$	4,601
	Corporate debenture			23,917			16,996
	Total liabilities			30,204			21,597
	Stockholders’ Equity:
	Common stock			453			301
	Additional paid-in capital			388,698			229,544
	Retained earnings			59,273			48,018
	Accumulated other comprehensive income			4,053			(4,484	)
	Total stockholders’ equity			452,477			273,379
	Total liabilities and stockholders’ equity		$	482,681		$	294,976
	Condensed Statements of Operations
	Years ended December 31, 2014, 2013 and 2012
			2014			2013			2012
	Dividend income		$	1,155		$	45,725		$	12,282
	Other income			—			—			5
	Interest expense			(942	)		(602	)		(835	)
	Operating expenses			(3,875	)		(3,538	)		(3,142	)
	Income before equity in undistributed income of subsidiaries			(3,662	)		41,585			8,310
	Equity in undistributed (losses) income of subsidiaries			14,828			(31,040	)		147
	Net income before income tax benefit			11,166			10,545			8,457
	Income tax benefit			(1,798	)		(1,697	)		(1,448	)
	Net income		$	12,964		$	12,243		$	9,905
	Condensed Statements of Cash Flows
	Years ended December 31, 2014, 2013 and 2012
			2014			2013			2012
	Cash flows from operating activities:
	Net income		$	12,964		$	12,243		$	9,905
	Adjustments to reconcile net income to net cash used in operating activities:
	Equity in net earnings of subsidiaries			(15,983	)		(14,686	)		(12,429	)
	Increase in payables and accrued expenses			(608	)		371			893
	Decrease (increase) in other assets			2,294			1,843			(1,164	)
	Stock based compensation expense			497			107			142
	Net cash flows used in operating activities			(836	)		(122	)		(2,653	)
	Cash flows from investing activities:
	Inter-company receivables from subsidiary banks			18,703			(43,703	)		17,000
	Net cash from bank acquisition			(16,455	)		—			—
	Investment in subsidiaries			—			—			(28,000	)
	Dividends from bank subsidiaries			—			34,000			10,000
	Dividends from nonbank subsidiary			1,155			11,725			2,282
	Net cash flows provided by investing activities			3,403			2,022			1,282
	Cash flows from financing activities:
	Stock options exercised, net of tax benefit			984			––			––
	Dividends paid to shareholders			(1,709	)		(1,204	)		(1,203	)
	Net cash flows used in financing activities			(725	)		(1,204	)		(1,203	)
	Net increase (decrease) in cash and cash equivalents			1,842			696			(2,574	)
	Cash and cash equivalents at beginning of year			966			270			2,844
	Cash and cash equivalents at end of year		$	2,808		$	966		$	270

Credit_Commitments

Credit Commitments	12 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Credit Commitments	-22	Credit Commitments
	The Company has outstanding at any time a significant number of commitments to extend credit.  These arrangements are subject to strict credit control assessments and each customer’s credit worthiness is evaluated on a case-by-case basis.
	A summary of commitments to extend credit and standby letters of credit written at December 31, 2014 and 2013, are as follows:
			December 31,
			2014		2013
	Standby letters of credit		$	10,299	$	6,769
	Available lines of credit			244,016		143,199
	Unfunded loan commitments – fixed			62,450		9,004
	Unfunded loan commitments – variable			17,416		14,179
	Because many commitments expire without being funded in whole or part, the contract amounts are not estimates of future cash flows.
	Credit risk represents the accounting loss that would be recognized at the reporting date if counterparties failed completely to perform as contracted.  The credit risk amounts are equal to the contractual amounts, assuming that the amounts are fully advanced and that the collateral or other security is of no value.
	The Company’s policy is to require customers to provide collateral prior to the disbursement of approved loans.  The amount of collateral obtained, if it is deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the counterparty.  Collateral held varies but may include accounts receivable, inventory, real estate and income providing commercial properties.
	Standby letters of credit are contractual commitments issued by the Company to guarantee the performance of a customer to a third party.  The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers.
	Outstanding commitments are deemed to approximate fair value due to the variable nature of the interest rates involved and the short-term nature of the commitments.

Concentrations_of_Credit_Risk

Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2014
Risks And Uncertainties [Abstract]
Concentrations of Credit Risk	-23	Concentrations of Credit Risk
	Most of the Company’s business activity is with customers located throughout Central, Southeastern and Northeastern Florida.  The majority of commercial and mortgage loans are granted to customers doing business or residing in these areas.  Generally, commercial loans are secured by real estate, and mortgage loans are secured by either first or second mortgages on residential or commercial property.  As of December 31, 2014, substantially all of the Company’s loan portfolio was secured.  Although the Company has a diversified loan portfolio, a substantial portion of its debtors’ ability to honor their contracts is dependent upon the economy of those areas listed above.  The Company does not have significant exposure to any individual customer or counterparty.

Basic_and_Diluted_Earnings_Per

Basic and Diluted Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Share	-24	Basic and Diluted Earnings Per Share
	The two-class method is used in the calculation of basic and diluted earnings per share. Under the two-class method, earnings available to common shareholders for the period are allocated between common shareholders and participating securities according to dividends declared (or accumulated) and participation rights in undistributed earnings.   There were an average of 928,692, 1,110,465, and 1,143,598 stock options that were not considered in computing diluted earnings per common share because they were anti-dilutive during the years ending December 31, 2014, 2013, and 2012, respectively.
	The following table presents the factors used in the earnings per share computations for the periods indicated.
			2014	2013	2012
	Basic
	Net income available to common shareholders		$12,964	$12,243	$9,905
	Less: Earnings allocated to participating securities		-17	—	—
	Net income allocated to common shareholders		$12,947	$12,243	$9,905
	Weighted average common shares outstanding
	including participating securities		40,904,988	30,102,777	30,073,959
	Less: Participating securities		-52,986	—	—
	Average shares		40,852,002	30,102,777	30,073,959
	Basic earnings per common share		$0.32	$0.41	$0.33
	Diluted
	Net income available to common shareholders		$12,947	$12,243	$9,905
	Weighted average common shares outstanding for
	basic earnings per common share		40,852,002	30,102,777	30,073,959
	Add: Dilutive effects of stock based compensation awards		383,550	117,350	67,904
	Average shares and dilutive potential common shares		41,235,552	30,220,127	30,141,863
	Dilutive earnings per common share		$0.31	$0.41	$0.33

Reportable_Segments

Reportable Segments	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Reportable Segments	-25	Reportable segments
	The Company’s reportable segments represent the distinct product lines the Company offers and are viewed separately for strategic planning purposes by management.  The tables below are reconciliations of the reportable segment revenues, expenses, and profit as viewed by management to the Company’s consolidated total for the year ending December 31, 2014, 2013 and 2012.
			Year ending December 31, 2014
						Correspondent			Corporate
			Commercial			banking and			overhead
			and retail			capital markets			and			Elimination
			banking			division			administration			entries			Total
	Interest income		$	134,938		$	3,289		$	—		$	—		$	138,227
	Interest expense			(6,365	)		(50	)		(941	)		—			(7,356	)
	Net interest income (expense)		$	128,573		$	3,239		$	(941	)		—		$	130,871
	Provision for loan losses			(826	)		—			—			—			(826	)
	Non interest income			6,073			20,153			—			—			26,226
	Non interest expense			(112,836	)		(19,470	)		(3,875	)		—			(136,181	)
	Net income (loss) before taxes		$	20,984		$	3,922		$	(4,816	)		—		$	20,090
	Income tax (provision) benefit			(7,411	)		(1,513	)		1,798			—			(7,126	)
	Net income (loss)		$	13,573		$	2,409		$	(3,018	)	$	—		$	12,964
	Total assets		$	3,487,014		$	280,079		$	482,681		$	(472,905	)	$	3,776,869
			Year ending December 31, 2013
						Correspondent			Corporate
			Commercial			banking and			overhead
			and retail			capital markets			and			Elimination
			banking			division			administration			entries			Total
	Interest income		$	97,504		$	2,874		$	—					$	100,378
	Interest expense			(5,263	)		(20	)		(602	)					(5,885	)
	Net interest income (expense)			92,241			2,854			(602	)					94,493
	Provision for loan losses			76			—			—						76
	Other non interest income			13,536			20,410			—						33,946
	Other non interest expense			(86,726	)		(20,498	)		(3,538	)					(110,762	)
	Net income (loss) before taxes			19,127			2,766			(4,140	)					17,753
	Income tax (provision) benefit			(6,140	)		(1,067	)		1,697						(5,510	)
	Net income (loss)		$	12,987		$	1,699		$	(2,443	)				$	12,243
	Total assets		$	2,279,221		$	132,821		$	294,976		$	(291,007	)	$	2,416,011
			Year ending December 31, 2012
						Correspondent			Corporate
			Commercial			banking and			overhead
			and retail			capital markets			and			Elimination
			banking			division			administration			entries			Total
	Interest income		$	90,899		$	4,051								$	94,950
	Interest expense			(7,617	)		(28	)		(836	)					(8,481	)
	Net interest income (expense)			83,282			4,023			(836	)					86,469
	Provision for loan losses			(9,220	)		—									(9,220	)
	Other non interest income			23,550			35,707			4						59,261
	Other non interest expense			(90,671	)		(28,168	)		(3,141	)					(121,980	)
	Net income (loss) before taxes			6,941			11,562			(3,973	)					14,530
	Income tax (provision) benefit			(1,722	)		(4,351	)		1,448						(4,625	)
	Net income (loss)		$	5,219		$	7,211		$	(2,525	)				$	9,905
	Total assets		$	2,204,176		$	153,289		$	294,744		$	(288,969	)	$	2,363,240
	Commercial and retail banking:  The Company’s primary business is commercial and retail banking.  Currently, the Company operates through one subsidiary bank and a non bank subsidiary, R4ALL, with 58 locations in 20 counties throughout Central Florida providing traditional deposit and lending products and services to its commercial and retail customers.
	Correspondent banking and capital markets division:  Operating as a division of our subsidiary bank, its primary revenue generating activities are related to the capital markets division which includes commissions earned on fixed income security sales, fees from hedging services, loan brokerage fees and consulting fees for services related to these activities. Income generated related to the correspondent banking services includes spread income earned on correspondent bank deposits (i.e. federal funds purchased) and fees generated from safe-keeping activities, bond accounting services, asset/liability consulting services, international wires, clearing and corporate checking account services and other correspondent banking related services. The fees derived from the correspondent banking services are less volatile than those generated through the capital markets group. The customer base includes small to medium size financial institutions primarily located in Southeastern United States.
	Corporate overhead and administration:  Corporate overhead and administration is comprised primarily of compensation and benefits for certain members of management, interest on parent company debt, office occupancy and depreciation of parent company facilities, merger related costs and other expenses.

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Combinations	-26	Business combinations
	Acquisition of Gulfstream Bancshares, Inc.
	On January 17, 2014, the Company completed its acquisition of Gulfstream Bancshares, Inc. (“Gulfstream”) whereby Gulfstream merged with and into the Company. Pursuant to and simultaneously with the merger of Gulfstream with and into the Company, Gulfstream’s wholly owned subsidiary bank, Gulfstream Business Bank (“GSB”), merged with and into the Company’s subsidiary bank, CenterState Bank of Florida, N.A.
	The Company’s primary reasons for the transaction were to further solidify its market share in the southeast Florida market and expand its customer base to enhance deposit fee income and leverage operating cost through economies of scale. The acquisition increased the Company’s total assets and total deposits by approximately 23% and 23%, respectively, as compared with the balances at December 31, 2013, and is expected to positively affect the Company’s operating results to the extent the Company earns more from interest earning assets than it pays in interest on its interest bearing liabilities.
	The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations. The Company recognized goodwill on this acquisition of $31,516, after consideration of a measurement period adjustment discussed below, which is nondeductible for tax purposes as this acquisition is a nontaxable transaction. The goodwill is calculated based on the fair values of the assets acquired and liabilities assumed as of the acquisition date. Fair value estimates are based on the information available, and are subject to change for up to one year after the closing date of the acquisition as additional information relative to closing date fair values becomes available. Fair values are preliminary estimates due to pending appraisals on loans and other real estate owned.
	The Company acquired 100% of the outstanding common stock of Gulfstream. The purchase price consisted of both cash and stock. Each share of Gulfstream common stock was exchanged for $14.65 cash and 3.012 shares of the Company’s common stock. Based on the closing price of the Company’s common stock on January 16, 2014, the resulting purchase price was $82,040. The table below summarizes the purchase price calculation.
	Number of shares of Gulfstream common stock outstanding at January 16, 2014			1,569,364
	Gulfstream preferred shares that converted to Gulfstream common shares upon a change in control			155,629
	Total Gulfstream common shares including conversion of preferred shares			1,724,993
	Per share exchange ratio			3.012
	Number of shares of CenterState common stock less 138 of fractional shares			5,195,541
	Multiplied by CenterState common stock price per share on January 16, 2014		$	10.23
	Fair value of CenterState common stock issued		$	53,150
	Total Gulfstream common shares including conversion of preferred shares			1,724,993
	Multiplied by the cash consideration each Gulfstream share is entitled to receive		$	14.65
	Total cash consideration, not including cash for fractional shares		$	25,271
	Total stock consideration		$	53,150
	Total cash consideration plus $2 for 138 of fractional shares			25,273
	Total consideration paid to Gulfstream common shareholders		$	78,423
	Fair value of current Gulfstream stock options converted to CenterState stock options			3,617
	Total purchase price		$	82,040
	The list below summarizes the estimates of the fair value of the assets purchased, including goodwill, and liabilities assumed as of the January 17, 2014 purchase date.
			Jan 17, 2014
	Assets:
	Cash and cash equivalents		$	102,278
	Loans, held for investment			329,515
	Purchased credit impaired loans			30,068
	Loans held for sale			247
	Investments			60,816
	Interest receivable			1,087
	Branch real estate			5,519
	Furniture and fixtures			262
	FHLB stock			885
	Bank owned life insurance			4,939
	Other repossessed real estate owned			2,694
	Core deposit intangible			4,173
	Goodwill			31,516
	Other assets			11,261
	Total assets acquired		$	585,260
	Liabilities:
	Deposits		$	478,999
	Federal Home Loan Bank advances			5,708
	Repurchase agreements			7,576
	Interest payable			125
	Official checks outstanding			826
	Corporate debentures			6,745
	Other liabilities			3,241
	Total liabilities assumed		$	503,220
	In the acquisition, the Company purchased $359,583 of loans at fair value, net of $18,267, or 4.8%, estimated discount to the outstanding principal balance, representing 24.4% of the Company’s total loans at December 31, 2013. Of the total loans acquired, management identified $30,068 with credit deficiencies. All loans that were on non-accrual status and all loan relationships that were greater than $500 and identified as impaired as of the acquisition date were considered by management to be credit impaired and are accounted for pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of January 17, 2014 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments.
	Contractually required principal and interest		$	48,289
	Non-accretable difference			(11,766	)
	Cash flows expected to be collected			36,523
	Accretable yield			(6,455	)
	Total purchased credit-impaired loans acquired		$	30,068
	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date.
			Book			Fair
			Balance			Value
	Loans:
	Single family residential real estate		$	33,506		$	32,319
	Commercial real estate			185,250			183,189
	Construction/development/land			30,387			27,704
	Commercial loans			85,940			84,203
	Consumer and other loans			2,112			2,100
	Purchased credit-impaired			40,655			30,068
Total earning assets		$	377,850		$	359,583
In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition have an intangible value. The Company applied ASC Topic 805, which prescribes the accounting for goodwill and other intangible assets such as core deposit intangibles, in a business combination. The Company determined the estimated fair value of the core deposit intangible asset totaled $4,173, which will be amortized utilizing an accelerated amortization method over an estimated economic life not to exceed ten years. In determining the valuation amount, deposits were analyzed based on factors such as type of deposit, deposit retention, interest rates and age of deposit relationships.
Measurement period adjustments
On January 17, 2014 the Company purchased Gulfstream. As previously disclosed, the fair values initially assigned to the assets acquired and liabilities assumed were preliminary and subject to refinement for up to one year after the closing date of the acquisition as new information relative to closing date fair values became available. Based on appraisals received subsequent to the acquisition date, the Company adjusted its initial fair value estimates of certain other real estate owned acquired.
		Jan 17, 2014			measurement			Jan 17, 2014
		(as initially reported)			period			(as adjusted)
					adjustments
Assets:
Cash and cash equivalents		$	102,278		$	—		$	102,278
Loans, held for investment			329,515						329,515
Purchased credit impaired loans			30,068						30,068
Loans held for sale			247						247
Investments			60,816						60,816
Interest receivable			1,087						1,087
Branch real estate			5,519						5,519
Furniture and fixtures			262						262
FHLB stock			885						885
Bank owned life insurance			4,939						4,939
Other repossessed real estate owned			3,365			(671	)		2,694
Core deposit intangible			4,173						4,173
Goodwill			31,104			412			31,516
Other assets			11,002			259			11,261
Total assets acquired		$	585,260		$	—		$	585,260
Liabilities:
Deposits		$	478,999		$	—		$	478,999
Federal Home Loan Bank advances			5,708						5,708
Repurchase agreements			7,576						7,576
Interest payable			125						125
Official checks outstanding			826						826
Corporate debenture			6,745						6,745
Other liabilities			3,241						3,241
Total liabilities assumed		$	503,220		$	—		$	503,220
Acquisition of First Southern Bancorp, Inc.
On June 1, 2014, the Company completed its acquisition of First Southern Bancorp, Inc. (“FSB”) whereby FSB merged with and into the Company. Pursuant to and simultaneously with the merger of FSB with and into the Company, FSB’s subsidiary bank, First Southern Bank, merged with and into the Company’s subsidiary bank, CenterState Bank of Florida, N.A.
The Company’s primary reasons for the transaction were to further solidify its market share in the southeast Florida market as well as in central and northeastern Florida and expand its customer base to enhance deposit fee income and leverage operating cost through economies of scale. The acquisition increased the Company’s total assets and total deposits by approximately 32% and 33%, respectively, as compared with the balances at March 31, 2014, and is expected to positively affect the Company’s operating results to the extent the Company earns more from interest earning assets than it pays in interest on its interest bearing liabilities.
The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations. The Company recognized goodwill on this acquisition of $299 after consideration of a measurement period adjustment discussed below, which is nondeductible for tax purposes as this acquisition is a nontaxable transaction. The goodwill is calculated based on the fair values of the assets acquired and liabilities assumed as of the acquisition date. Fair value estimates are based on the information available, and are subject to change for up to one year after the closing date of the acquisition as additional information relative to closing date fair values becomes available. Fair values are preliminary estimates due to pending appraisals on loans and other real estate owned.
The Company acquired 100% of the outstanding common stock of FSB. The purchase price consisted of both cash and stock. Each share of FSB common stock was exchanged for $3.00 cash and 0.30 shares of the Company’s common stock. Based on the closing price of the Company’s common stock on May 30, 2014 (the last trading day prior to the June 1, 2014 acquisition date), the resulting purchase price was $195,404. The table below summarizes the purchase price calculation.
Number of shares of FSB common stock outstanding at May 30, 2014			31,539,698
FSB preferred shares that converted to FSB common shares upon a change in control			48,375
Total FSB common shares including conversion of preferred shares			31,588,073
Per share exchange ratio			0.3
Number of shares of CenterState common stock, less 377 of fractional shares			9,476,045
Multiplied by CenterState common stock price per share on May 30, 2014		$	10.62
Fair value of CenterState common stock issued		$	100,636
Total FSB common shares including conversion of preferred shares			31,588,073
Multiplied by the cash consideration each FSB share is entitled to receive		$	3
Total cash consideration, not including cash for fractional shares		$	94,765
Total stock consideration		$	100,636
Total cash consideration, plus $3 for 377 of fractional shares			94,768
Total purchase price		$	195,404
The list below summarizes the preliminary estimates of the fair value of the assets purchased, including goodwill, and liabilities assumed as of the June 1, 2014 purchase date.
		June 1, 2014
Assets:
Cash and cash equivalents		$	148,257
Loans, excluding purchased credit impaired loans			477,841
Purchased credit impaired loans			121,684
Investments			204,723
Interest receivable			2,007
Branch real estate			1,594
Furniture and fixtures			1,282
Bank property held for sale			7,119
Federal Reserve Bank and Federal Home Loan Bank stock			5,576
Bank owned life insurance			2,555
Other repossessed real estate owned covered by FDIC loss share agreements			22,731
Other repossessed real estate owned			454
Core deposit intangible			7,396
Goodwill			299
Deferred tax asset			44,131
Other assets			4,581
Total assets acquired		$	1,052,230
Liabilities:
Deposits		$	662,959
Deposits held for sale			189,674
Interest payable			58
Other liabilities			4,135
Total liabilities assumed		$	856,826
In the acquisition, the Company purchased $599,525 of loans at fair value, net of $30,811, or 4.9%, estimated discount to the outstanding principal balance, representing 33% of the Company’s total loans at March 31, 2014. Of the total loans acquired, management identified $121,684 with credit deficiencies. All loans that were on non-accrual status, all TDRs, all impaired loans, all loans previously identified by FSB with credit deficiencies and any other loan identified by the Company with a probable credit deficiency were considered by management to be credit impaired and are accounted for pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of June 1, 2014 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments.
Contractually required principal and interest		$	180,960
Non-accretable difference			(33,527	)
Cash flows expected to be collected			147,433
Accretable yield			(25,749	)
Total purchased credit-impaired loans acquired		$	121,684
The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date.
		Book			Fair
		Balance			Value
Loans:
Single family residential real estate		$	60,332		$	57,693
Commercial real estate			387,589			382,162
Construction/development/land			17,238			15,942
Commercial loans			20,267			19,906
Consumer and other loans			2,496			2,138
Purchased credit-impaired			142,414			121,684
Total earning assets		$	630,336		$	599,525
In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition have an intangible value. The Company applied ASC Topic 805, which prescribes the accounting for goodwill and other intangible assets such as core deposit intangibles, in a business combination. The Company determined the estimated fair value of the core deposit intangible asset totaled $7,396, which will be amortized utilizing an accelerated amortization method over an estimated economic life not to exceed ten years. In determining the valuation amount, deposits were analyzed based on factors such as type of deposit, deposit retention, interest rates and age of deposit relationships.
Measurement period adjustments
On June 1, 2014 the Company purchased FSB. As previously disclosed, the fair values initially assigned to the assets acquired and liabilities assumed were preliminary and subject to refinement for up to one year after the closing date of the acquisition as new information relative to closing date fair values became available. Based on income tax returns filed subsequent to the acquisition date, the Company adjusted its initial fair value estimate of the deferred tax asset acquired.
		June 1, 2014			measurement			June 1, 2014
		(as initially reported)			period			(as adjusted)
					adjustments
Assets:
Cash and cash equivalents		$	148,257		$	—		$	148,257
Loans, excluding purchased credit impaired loans			477,841						477,841
Purchased credit impaired loans			121,684						121,684
Investments			204,723						204723
Interest receivable			2,007						2,007
Branch real estate			1,594						1,594
Furniture and fixtures			1,282						1,282
Bank property held for sale			7,119						7119
Federal Reserve Bank and Federal Home Loan Bank stock			5,576						5576
Bank owned life insurance			2,555						2,555
OREO covered by FDIC loss share agreements			22,731						22,731
Other repossessed real estate owned (“OREO”)			454						454
Core deposit intangible			7,396						7,396
Goodwill			541			(242	)		299
Deferred tax asset			43,889			242			44,131
Other assets			4,581						4,581
Total assets acquired		$	1,052,230			—		$	1,052,230
Liabilities:
Deposits			662,959						662,959
Federal Home Loan Bank advances			189,674						189674
Repurchase agreements			58						58
Other liabilities			4,135						4,135
Total liabilities assumed		$	856,826		$	—		$	856,826
Pro-forma information
Pro-forma data for the twelve month period ending December 31, 2013 listed in the table below presents pro-forma information as if the Gulfstream acquisition occurred at the beginning of 2013. Because the Gulfstream transaction closed on January 17, 2014 and its actual results are included in the Company’s actual operating results for 2014, its actual results were used in the table below for the twelve month period ending December 31, 2014 instead of a pro-forma amount.   The pro-forma information for the twelve month periods ending December 31, 2014 and 2013 assumes the FSB acquisition occurred at the beginning of 2013.
		Years ended December 31,
		2014			2013
Net interest income		$	143,527		$	153,719
Net income available to common shareholders			20,066			21,390
EPS - basic		$	0.45		$	0.48
EPS - diluted		$	0.44		$	0.47
Disposition of certain branches acquired pursuant to the FSB acquisition.
The Company consummated its previously announced sale of deposits and certain branch real estate acquired pursuant to its FSB acquisition. On September 18, 2014, the Company sold approximately $170 million of deposits from six prior FSB branches for a premium of 1.5% and the related real estate for five branch offices for approximately $6 million. On September 19, 2014, the Company also closed and consolidated four additional branch offices which were also acquired from FSB.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	-27	Derivatives
	The Company enters into interest rate swaps in order to provide commercial loan clients the ability to swap from fixed to variable interest rates.  Under these agreements, the Company enters into a fixed-rate loan with a client in addition to a swap agreement.  This swap agreement effectively converts the client’s fixed rate loan into a variable rate.  The Company then enters into a matching swap agreement with a third party dealer in order to offset its exposure on the customer swap.  At years ended December 31, 2014 and 2013, the notional amount of such arrangements was $240,779 and $91,058, respectively, and investment securities with a fair value of $10,445 and $6,140 were pledged as collateral to the third party dealers.  As the interest rate swaps with the clients and third parties are not designated as hedges under ASC 815, changes in market values are reported in earnings.
	Summary information about the derivative instruments is as follows:
			2014			2013
	Notional amount		$	240,779		$	91,058
	Weighted average pay rate on interest-rate swaps			3.96	%		4.34	%
	Weighted average receive rate on interest rate swaps			1.5	%		1.71	%
	Weighted average maturity (years)			11			10
	Fair value of interest rate swap derivatives (asset)		$	6,800		$	2,603
	Fair value of interest rate swap derivatives (liability)		$	7,575		$	2,496

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Nature of Operations and Principles of Consolidation	(a)	Nature of operations and principles of consolidation
	The consolidated financial statements of CenterState Banks, Inc. (the “Company”) include the accounts of CenterState Banks, Inc. (the “Parent Company”), and its wholly owned subsidiaries CenterState Bank of Florida, N.A. and R4ALL, Inc.  All significant intercompany accounts and transactions have been eliminated in consolidation.
	At December 31, 2014, the Company, through its subsidiary banks, operates through 58 full service banking locations in 20 counties throughout Central, Northeast and Southeast Florida, providing traditional deposit and lending products and services to its commercial and retail customers.  The Company’s primary deposit products are checking, savings and term certificate accounts, and its primary lending products include commercial real estate loans, residential real estate loans, commercial loans and consumer loans.  Substantially all loans are secured by commercial real estate, residential real estate, business assets or consumer assets.  There are no significant concentrations of loans to any one industry or customer.  However, the customers’ ability to repay their loans is dependent on the real estate and general economic conditions in the area.
	The Company, through its CenterState Bank of Florida, N.A. subsidiary, also operates a correspondent banking and capital markets division.  The division is integrated with and part of the subsidiary bank located in Winter Haven, Florida, although the majority of the bond salesmen, traders and support personnel are physically located in leased facilities in Birmingham, Alabama and Atlanta, Georgia.  The primary revenue generating activity of this division is commissions earned on fixed income security sales.  Other revenue generating activities include correspondent bank deposits (i.e. federal funds purchased), fees earned on correspondent bank checking accounts, fees earned from safe-keeping activities, bond accounting services for correspondents, and asset/liability consulting related activities.
	R4ALL, Inc. is a non bank subsidiary incorporated during the third quarter of 2009.  The primary purpose of this subsidiary is to purchase, hold, and dispose of troubled assets acquired from the Company’s subsidiary bank.
	The following is a description of the basis of presentation and the significant accounting and reporting policies, which the Company follows in preparing and presenting its consolidated financial statements.
Use of Estimates	(b)	Use of estimates
	To prepare financial statements in conformity with U.S. generally accepted accounting principles, management makes estimates and assumptions based on available information.  These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided.  Significant items subject to estimates and assumptions include allowance for loan losses, FDIC indemnification asset, fair values of financial instruments, useful life of intangibles and valuation of goodwill, fair value estimates of stock-based compensation, fair value estimates of OREO, and deferred tax assets.  Actual results could differ from these estimates.
Cash Flow Reporting	(c)	Cash flow reporting
	For purposes of the statement of cash flows, the Company considers cash and due from banks, federal funds sold, money market and non interest bearing deposits in other banks with a purchased maturity of three months or less to be cash equivalents.  Net cash flows are reported for customer loan and deposit transactions, interest bearing deposits in other financial institutions, federal funds purchased, repurchase agreements, proceeds from capital offering and other borrowed funds.
Interest Bearing Deposits in Other Financial Institutions	(d)	Interest bearing deposits in other financial institutions
	Interest bearing deposits in other financial institutions mature within one year and are carried at cost and are included in cash and due from banks in the Consolidated Balance Sheets.
Trading Securities
	(e)	Trading securities
	The Company engages in trading activities for its own account.  Securities that are held principally for resale in the near term are recorded at fair value with changes in fair value included in earnings.  Interest is included in net interest income.
Securities	(f)	Securities
	Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity.  Debt securities not classified as held to maturity or trading are classified as available for sale.  Securities available for sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of tax.
	Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage backed securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method.
	Securities are evaluated for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) other-than-temporary impairment related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis.
Bond Commissions Revenue Recognition	(g)	Bond commissions revenue recognition
	Bond sales transactions and related revenue and expenses are recorded on a settlement date basis.  The effect on the financial statements of using the settlement date basis rather than the trade date basis is not material.
Loans Held for Sale	(h)	Loans held for sale
	Mortgage loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by outstanding commitments from investors.  Net unrealized losses, if any, are recorded as a valuation allowance and charged to earnings.  Mortgage loans held for sale are generally sold with servicing rights released.  Gains and losses on sales of mortgage loans are based on the difference between the selling price and the carrying value of the related loan sold.
Loans	(i)	Loans
	Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding unpaid principal balance net of purchase premiums and discounts, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the unpaid principal balance. The recorded investment in a loan excludes accrued interest receivable, deferred fees, and deferred costs because they are not considered material.
	A loan is considered a troubled debt restructured loan based on individual facts and circumstances. A modification may include either an increase or reduction in interest rate or deferral of principal payments or both.   Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings. The Company classifies troubled debt restructured loans as impaired and evaluates the need for an allowance for loan losses on a loan-by-loan basis. An allowance for loan losses is based on either the present value of estimated future cash flows or the estimated fair value of the underlying collateral. Loans retain their interest accrual status at the time of modification.
	Loan origination fees and the incremental direct cost of loan origination, are deferred and recognized in interest income without anticipating prepayments over the contractual life of the loans. If the loan is prepaid, the remaining unamortized fees and costs are charged or credited to interest income. Amortization ceases for nonaccrual loans.
	A loan is moved to nonaccrual status in accordance with the Company’s policy typically after 90 days of non-payment, or less than 90 days of non-payment if management determines that the full timely collection of principal and interest becomes doubtful. Past due status is based on the contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. Nonaccrual loans and loans past due 90 days still on accrual include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans.  Single family home loans, consumer loans and smaller commercial, land, development and construction loans (less than $500) are monitored by payment history, and as such, past due payments is generally the triggering mechanism to determine nonaccrual status.  Larger (greater than $500) commercial, land, development and construction loans are monitored on a loan level basis, and therefore in these cases it is more likely that a loan may be placed on nonaccrual status before it becomes 90 days past due.
	All interest accrued but not received for loans placed on nonaccrual, is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Non real estate consumer loans are typically charged off no later than 120 days past due.
	The Company, considering current information and events regarding the borrower’s ability to repay their obligations, considers a loan to be impaired when it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is considered to be impaired, the amount of the impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the secondary market value of the loan, or the fair value of the collateral for collateral dependent loans. Interest income on impaired loans is recognized in accordance with the Company’s non-accrual policy. Impaired loans are written down to the extent that principal is judged to be uncollectible and, in the case of impaired collateral dependent loans where repayment is expected to be provided solely by the underlying collateral and there is no other available and reliable sources of repayment, are written down to the lower of cost or collateral value less estimated selling costs. Impairment losses are included in the allowance for loan losses. Large groups of smaller balance homogeneous loans, such as consumer and residential real estate loans, are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures.
Purchased Credit-Impaired Loans	(j)	Purchased credit-impaired loans
	As a part of business acquisitions, the Company acquires loans, some of which have shown evidence of credit deterioration since origination. These purchased credit-impaired (“PCI”) loans were determined to be credit impaired based on specific risk characteristics of the loan, including product type, domicile of the borrower, past due status, owner occupancy status, geographic location of the collateral, and loan to value ratios. Purchasers are permitted to aggregate credit impaired loans acquired in the same fiscal quarter into one or more pools, provided that the loans have common risk characteristics. A pool is then accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. For the loan portfolios acquired through failed bank acquisitions, the Company aggregated the commercial, consumer, and residential loans into ten pools of loans with common risk characteristics for each FDIC failed institution acquired. These acquired loans were recorded at the acquisition date fair value, and after acquisition, losses are recognized through the allowance for loan losses. The Company estimates the amount and timing of expected cash flows for each acquired loan pool and the expected cash flows in excess of the amount paid is recorded as interest income over the remaining life of the loan pools.
	On a quarterly basis, the Company updates the amount of loan principal and interest cash flows expected to be collected, incorporating assumptions regarding default rates, loss severities, the amounts and timing of prepayments and other factors that are reflective of current market conditions. Probable decreases in expected loan principal cash flows trigger the recognition of impairment, which is then measured as the present value of the expected principal loss plus any related foregone interest cash flows discounted at the pool’s effective interest rate. Impairments that occur after the acquisition date are recognized through the provision for loan losses. Probable and significant increases in expected principal cash flows would first reverse any previously recorded allowance for loan losses; any remaining increases are recognized prospectively as interest income. The impacts of (i) prepayments, (ii) changes in variable interest rates, and (iii) any other changes in the timing of expected cash flows are recognized prospectively as adjustments to interest income. Disposals of loans, which may include sales of loans, receipt of payments in full by the borrower, or foreclosure, result in removal of the loan from the purchased credit impaired portfolio.
Concentration of Credit Risk	(k)	Concentration of credit risk
	Most of the Company’s business activity is with customers located within Florida.  Therefore, the Company’s exposure to credit risk is significantly affected by changes in the economy and the real estate market within Florida, primarily central, southeastern and northeastern Florida.
Allowance for Loan Losses	(l)	Allowance for loan losses
	The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged-off.
	The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired. The general component covers loans that are not individually classified as impaired and is based on historical loss experience adjusted for current factors.
	A loan is impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loans, for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired.
	Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed.
	If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Commercial, commercial real estate, land, acquisition and development, and construction loans over $500 are individually evaluated for impairment.  Large groups of smaller balance homogeneous loans, such as consumer and residential real estate loans, are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Company determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses. The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the most recent two years.  The portfolio segments identified by the Company are residential loans, commercial real estate loans, construction and land development loans, commercial and industrial and consumer and other. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; volume and severity of adversely classified or graded loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations.
	At December 31, 2014, the Company evaluated the Gulfstream Business Bank (“GSB”) loans that were not PCI loans as a separate portfolio segment. The Company evaluated this sixth loan portfolio segment during the fourth quarter of 2014 and an initial general loan loss allowance was recorded at December 31, 2014.  The Company considered the levels of and trends in non-performing loans, past-due loans, adverse loan grade classification changes, historical loss rates, environmental factors and impaired loans in arriving at its estimate.   The general loan loss allowance recorded for these performing loans acquired from GSB is allocated between the five portfolio segments as described below.
	The Company segregates and evaluates its loan portfolio through the five portfolio segments: residential real estate, commercial real estate, land/ land development/construction, commercial and consumer/other.
	Residential real estate loans are a mixture of fixed rate and adjustable rate residential mortgage loans, including first mortgages, second mortgages or home equity lines of credit. As a policy, the Company holds adjustable rate loans and sells a portion of its fixed rate loan originations into the secondary market. Changes in interest rates or market conditions may impact a borrower’s ability to meet contractual principal and interest payments. Residential real estate loans are secured by real property.
	Commercial real estate loans include loans secured by office buildings, warehouses, retail stores and other property located in or near our markets. These loans are originated based on the borrower’s ability to service the debt and secondarily based on the fair value of the underlying collateral.
	Land/land development/construction loans include residential and commercial real estate loans and include a mixture of owner occupied and non-owner occupied. The majority of the loans in this category are land related, either undeveloped land, land held for development, residential building lots and commercial building lots. Generally the terms are three to five years, with a potential for renewal at maturity.
	Commercial loans consist of small-to medium-sized businesses including professional associations, medical services, retail trade, transportation, wholesale trade, manufacturing and tourism. Commercial loans are derived from our market areas and underwritten based on the borrower’s ability to service debt from the business’s underlying cash flows. As a general practice, we obtain collateral such as inventory, accounts receivable, equipment or other assets although such loans may be uncollateralized but guaranteed.
	Consumer and other loans include automobiles, boats, mobile homes without land, or uncollateralized but personally guaranteed loans. These loans are originated based primarily on credit scores, debt-to-income ratios and loan-to-value ratios.
Transfer of Financial Assets
	(m)	Transfer of financial assets
	Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished.  Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Other Repossessed Real Estate Owned	(n)	Other repossessed real estate owned
	Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis.  These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell.  If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense.  Operating costs after acquisition are expensed.  Repossessed real estate is included in other repossessed real estate owned and other repossessed assets other than real estate is included in prepaid expenses and other assets in the Consolidated Balance Sheets.
Premises and Equipment	(o)	Premises and equipment
	Land is carried at cost.  Premises and equipment are stated at cost less accumulated depreciation.  Depreciation is provided on a straight-line basis over the estimated useful lives of the related assets.  Buildings are depreciated over a 39 year period, and furniture, fixtures and equipment are depreciated over their related useful life (3 to 15 years).  Leasehold improvements are depreciated over the shorter of their useful lives or the term of the lease.  Major renewals and betterments of property are capitalized; maintenance, repairs, and minor renewals and betterments are expensed in the period incurred.  Upon retirement or other disposition of the asset, the asset cost and related accumulated depreciation are removed from the accounts, and gains or losses are included in income.
Software Costs	(p)	Software costs
	Costs of software developed for internal use, such as those related to software licenses, programming, testing, configuration, direct materials and integration, are capitalized and included in premises and equipment.  Included in the capitalized costs are those costs related to both our personnel and third party consultants involved in the software development and installation.  Once placed in service, the capitalized asset is amortized on a straight-line basis over its estimated useful life, generally three to five years.  Capitalized costs of software developed for internal use are reviewed periodically for impairment.
Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock	(q)	Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock
	The Company’s subsidiary bank is a member of the FHLB and FRB system.  Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts.  FHLB and FRB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value.  Both cash and stock dividends are reported as income.
Bank Owned Life Insurance (BOLI)	(r)	Bank owned life insurance (BOLI)
	The Company, through its subsidiary bank, has purchased life insurance policies on certain key executives. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
Goodwill and Other Intangible Assets	(s)	Goodwill and other intangible assets
	Goodwill resulting from business combinations prior to January 1, 2009 represents the excess of the purchase price over the fair value of the net assets of businesses acquired. Goodwill resulting from business combinations after January 1, 2009, is generally determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but tested for impairment at least annually. The Company has selected November 30 as the date to perform the annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on the Company’s balance sheet.
	The core deposit intangibles are intangible assets arising from either whole bank acquisitions or branch acquisitions. They are initially measured at fair value and then amortized over a ten-year period on an accelerated basis using the projected decay rates of the underlying core deposits.
	The trust intangible represents the value of the Trust business (“Trust”) acquired pursuant to the Company’s January 27, 2012 acquisition of First Guaranty Bank and Trust of Jacksonville (“FGB”) in Jacksonville, Florida.  The intangible was initially measured at fair value and then amortized over a ten-year period on an accelerated basis.
FDIC Indemnification Asset	(t)	FDIC Indemnification Asset
	The FDIC Indemnification Asset represents the estimated amounts due from the FDIC pursuant to the Loss Share Agreements related to the acquisitions of the three failed banks acquired in 2010, two in 2012 and assumed two additional pursuant to the Company’s 2014 acquisition of First Southern Bank. At acquisition, the FDIC Indemnification Asset represented the discounted value of the FDIC’s reimbursed portion of the estimated losses the Company expects to realize on the loans and other real estate (“Covered Assets”) acquired as a result of the acquisitions. The range of discount rates used on the FDIC Indemnification Asset was 1.21% to 4.53%.  As losses are realized on Covered Assets, the portion that the FDIC pays the Company in cash for principal and up to 90 days of interest reduces the FDIC Indemnification Asset.  On a quarterly basis, the Company will evaluate the FDIC Indemnification Asset to determine if the estimated losses on Covered Assets support the amount recorded as the FDIC Indemnification Asset.  Income accretion is recognized during the loss share period. If the expectation of future losses decline, the income accretion is reduced prospectively over the lesser of the term of the loss share agreement and the estimated remaining life of the Covered Asset.
Loan Commitments and Related Financial Instruments	(u)	Loan commitments and related financial instruments
	Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs.  The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay.  Such financial instruments are recorded when they are funded.
Stock-Based Compensation	(v)	Stock-based compensation
	Compensation cost is recognized for stock options and restricted stock awards issued to employees, based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the date of grant is used for restricted stock awards.  During 2014 the Company initiated a Long-Term Incentive Plan which included Performance Share Units (“PSUs”).  The Monte-Carlo Simulation model was used to estimate fair value of the PSUs at the grant date.  Compensation cost is recognized over the required service period, generally defined as the vesting period.
Income Taxes	(w)	Income taxes
	Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities.  Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates.  A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized.
	A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur.  The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination.  For tax positions not meeting the “more likely than not” test, no tax benefit is recorded.
	The Company recognizes interest and/or penalties related to income tax matters in other expenses.
Retirement Plans	(x)	Retirement plans
	Employee 401(k) plan expense is the amount of matching contributions.  Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service.
Advertising And Marketing Costs [Policy Text Block]	(y)	Marketing and advertising costs
	Marketing and advertising costs are expensed as incurred.
Earnings Per Common Share	(z)	Earnings per common share
	Basic earnings per common share is net income divided by the weighted average number of common shares outstanding during the period.  All outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends are considered participating securities for this calculation.  Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock options and unvested restricted stock awards where shares are not issued until vested.  Earnings and dividends per share are restated for all stock splits and stock dividends through the date of issuance of the financial statements.
Comprehensive Income	(aa)	Comprehensive income
	Comprehensive income consists of net income and other comprehensive income.  Other comprehensive income includes unrealized gains and losses on securities available for sale, which are also recognized as separate components of shareholders’ equity.
Loss Contingencies	(ab)	Loss contingencies
	Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated.  Management does not believe there now are such matters that will have a material effect on the financial statements.
Restrictions on Cash	(ac)	Restrictions on cash
	Cash on hand or on deposit with the Federal Reserve Bank is generally required to meet regulatory reserve and clearing requirements.
Dividend Restriction	(ad)	Dividend restriction
	Banking regulations require maintaining certain capital levels and may limit the dividends paid by the banks to the holding company or by the holding company to stockholders.
Fair Value of Financial Instruments	(ae)	Fair value of financial instruments
	Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in a separate note.  Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items.  Changes in assumptions or in market conditions could significantly affect the estimates.
Segment Reporting	(af)	Segment reporting
	The Company’s correspondent banking and capital markets division represents a distinct reportable segment which differs from the Company’s primary business of commercial and retail banking in Florida.  Accordingly, a reconciliation of reportable segment revenues, expenses and profit to the Company’s consolidated total has been presented in note 25.
Derivatives	(ag)	Derivatives
	The Company enters into interest rate swaps in order to provide commercial loan clients the ability to swap from fixed to variable interest rates.  Under these agreements, the Company enters into a fixed-rate loan with a client in addition to a swap agreement.  This swap agreement effectively converts the client’s fixed rate loan into a variable rate.  The Company then enters into a matching swap agreement with a third party dealer in order to offset its exposure on the customer swap.  The Company does not use derivatives for trading purposes. The derivative transactions are considered instruments with no hedging designation, otherwise known as stand-alone derivatives. Changes in the fair value of the derivatives are reported currently in earnings.
Reclassifications	(ah)	Reclassifications
	Some items in the prior year financial statements were reclassified to conform to the current presentation.  Reclassifications had no effect on prior years’ net income or shareholders’ equity.
Effect of New Pronouncements	(ai)	Effect of new pronouncements
	In January 2014, the FASB amended existing guidance to clarify when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan should be derecognized and the real estate recognized. These amendments clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either: (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure, or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additional disclosures are required.  These amendments are effective for public business entities for annual periods and interim periods within those annual periods beginning after December 15, 2014.  Amendments in this standard can be applied using a modified retrospective or prospective transition method.  Early adoption is permitted. The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
	In May 2014 the FASB amended existing guidance related to revenue from contracts with customers. This amendment supersedes and replaces nearly all existing revenue recognition guidance, including industry-specific guidance, establishes a new control-based revenue recognition model, changes the basis for deciding when revenue is recognized over time or at a point in time, provides new and more detailed guidance on specific topics and expands and improves disclosures about revenue. In addition, this amendment specifies the accounting for some costs to obtain or fulfill a contract with a customer. These amendments are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period.  Early application is not permitted. The amendments should be applied retrospectively to all periods presented or retrospectively with the cumulative effect recognized at the date of initial application.  The Company is currently evaluating the impact of this new accounting standard on the consolidated financial statements.
	In June 2014, the FASB amended existing guidance related to repurchase-to-maturity transactions, repurchase financings, and disclosures. These amendments align the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. The guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. These amendments require a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. These amendments also require expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings.  These amendments are effective for the first interim or annual period beginning after December 15, 2014.  In addition, for public companies, the disclosure for certain transactions accounted for as a sale is effective for the first interim or annual period beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required for annual periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015.  An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption.  Early adoption is prohibited for a public company. Entities may elect to apply the requirements for interim periods beginning after December 15, 2014. The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
	In June 2014, the FASB amended existing guidance related to the accounting for share-based payments when the terms of an award provide that a performance target could be achieved after the requisite service period. These amendments require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718, Compensation – Stock Compensation, as it relates to awards with performance conditions that affect vesting to account for such awards. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved.  These amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015.  Early adoption is permitted.  Entities may apply the amendments in this amendment either: (a) prospectively to all awards granted or modified after the effective date; or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter.   The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
	In August 2014, the FASB amended existing guidance related to the classification of certain government-guaranteed mortgage loans, including those guaranteed by the FHA and the VA, upon foreclosure. It requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: 1) The loan has a government guarantee that is not separable from the loan before foreclosure; 2) At the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and 3) At the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor.  These amendments are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014.  Early adoption is permitted if the amendments under ASU 2014-04 Receivables – Troubled Debt Restructurings by Creditors – Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure has been adopted. The amendments may be applied using a prospective transition method in which a reporting entity applies the guidance to foreclosures that occur after the date of adoption, or a modified retrospective transition using a cumulative-effect adjustment (through a reclassification to a separate other receivable) as of the beginning of the annual period of adoption.  Prior periods should not be adjusted.  A reporting entity must apply the same method of transition as elected under ASU 2014-04.  The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
	In August 2014, the FASB amended existing guidance related to the disclosures about an entity’s ability to continue as a going concern. These amendments are intended to define management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern and to provide related footnote disclosures. These amendments provide guidance to an organization’s management, with principles and definitions that are intended to reduce diversity in the timing and content of disclosures that are commonly provided by organizations in the financial statement footnotes.  The amendments are effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016.  Early application is permitted for annual or interim reporting periods for which the financial statements have not previously been issued.  The adoption of this standard is not expected to have a material effect on the Company’s operating results or financial condition.
	In July 2013, the FASB amended existing guidance related to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss or a tax credit carryforward exists. These amendments provide that an unrecognized tax benefit, or a portion thereof, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except to the extent that a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date to settle any additional income taxes that would result from disallowance of a tax position, or the tax law does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, then the unrecognized tax benefit should be presented as a liability.  These amendments are effective for interim and annual reporting periods beginning after December 15, 2013.  The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Retrospective application is permitted. Early adoption and retrospective application is permitted. The adoption of this standard did not have a material effect on the Company’s operating results or financial condition.

Trading_Securities_Tables

Trading Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]
Trading Securities Portfolio Realized and Unrealized Gains and Losses	A list of the activity in this portfolio for 2014 and 2013 is summarized below.
		2014			2013
	Beginning balance	$	—		$	5,048
	Purchases		171,089			198,186
	Proceeds from sales		(167,838	)		(203,489	)
	Net realized gain on sales		156			255
	Mark-to- market adjustment		13			—
	Ending balance	$	3,420		$	—

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value of Available for Sale Securities and Related Gross Unrealized Gains and Losses Recognized in Accumulated Other Comprehensive Income (Loss)	The fair value of available for sale securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) were as follows:
		December 31, 2014
				Gross		Gross
		Amortized		Unrealized		Unrealized		Fair
		Cost		Gains		Losses		Value
	Obligations of U.S. government sponsored entities and agencies	$	3	$	—	$	—	$	3
	Mortgage backed securities		473,396		6,897		1,660		478,633
	Municipal securities		37,460		1,412		51		38,821
	Total available-for-sale	$	510,859	$	8,309	$	1,711	$	517,457
		31-Dec-13
				Gross		Gross
		Amortized		Unrealized		Unrealized		Fair
		Cost		Gains		Losses		Value
	Obligations of U.S. government sponsored entities and agencies	$	4	$	—	$	—	$	4
	Mortgage backed securities		424,654		4,623		12,396		416,881
	Municipal securities		39,728		921		448		40,201
	Total available-for-sale	$	464,386	$	5,544	$	12,844	$	457,086
Schedule of Sales of Available for Sale Securities	Sales of available for sale securities were as follows:
		2014		2013		2012
	Proceeds	$	323,537	$	69,495	$	168,809
	Gross gains	$	1,175	$	1,060	$	2,706
	Gross losses	$	1,129	$	—	$	283
Fair Value of Held to Maturity Securities and Related Gross Unrecognized Gains and Losses Recognized in Accumulated Other Comprehensive Income (Loss)	The following reflects the fair value of held to maturity securities and the related gross unrecognized gains and losses as of December 31, 2014. There were no securities held to maturity as of December 31, 2013.
		December 31, 2014
				Gross		Gross
		Amortized		Unrecognized		Unrecognized		Fair
		Cost		Gains		Losses		Value
	Obligations of U.S. government sponsored entities and agencies	$	49,793	$	122	$	—	$	49,915
	Mortgage backed securities		161,727		653		—		162,381
	Municipal securities		25,842		305		12		26,135
	Total held to maturity	$	237,362	$	1,080	$	12	$	238,431
Available-for-sale Securities [Member]
Fair Value and Amortized Cost of Investment Securities by Contractual Maturity	The fair value and amortized cost of available for sale securities at year end 2014 by contractual maturity were as follows.  Mortgage-backed securities are not due at a single maturity date and are shown separately.
				Amortized
	Investment securities available for sale:	Fair Value		Cost
	Due in one year or less	$	532	$	517
	Due after one year through five years		1,565		1,498
	Due after five years through ten years		17,262		16,638
	Due after ten years through thirty years		19,465		18,810
	Mortgage backed securities		478,633		473,396
	Total available-for-sale	$	517,457	$	510,859
Investments Gross Unrealized Losses and Fair Value	The following tables show the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2014 and 2013.
		December 31, 2014
		Less than 12 months				12 months or more				Total
				Unrealized				Unrealized				Unrealized
		Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	Mortgage backed securities	$	15,876	$	41	$	99,010	$	1,619	$	114,886	$	1,660
	Municipal securities		—		—		3,194		51		3,194		51
	Total temporarily impaired available-for-sale securities	$	15,876	$	41	$	102,204	$	1,670	$	118,080	$	1,711
		31-Dec-13
		Less than 12 months				12 months or more				Total
				Unrealized				Unrealized				Unrealized
		Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	Mortgage backed securities	$	239,641	$	10,221	$	18,793	$	2,175	$	258,434	$	12,396
	Municipal securities		7,603		333		1,010		115		8,613		448
	Total temporarily impaired available-for-sale securities	$	247,244	$	10,554	$	19,803	$	2,290	$	267,047	$	12,844
Held-to-maturity Securities [Member]
Fair Value and Amortized Cost of Investment Securities by Contractual Maturity	The fair value and amortized cost of held to maturity securities at year end 2014 by contractual maturity were as follows.  Mortgage-backed securities are not due at a single maturity date and are shown separately.
				Amortized
	Investment securities held to maturity	Fair Value		Cost
	Due after five years through ten years	$	44,515	$	44,393
	Due after ten years through thirty years		31,535		31,242
	Mortgage backed securities		162,381		161,727
	Total held-to-maturity	$	238,431	$	237,362
Investments Gross Unrecognized Losses and Fair Value	The following tables show the Company’s held to maturity investments’ gross unrecognized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrecognized loss position, at December 31, 2014.
		December 31, 2014
		Less than 12 months				12 months or more				Total
				Unrecognized				Unrecognized				Unrecognized
		Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	Municipal securities	$	2,475	$	12	$	—	$	—	$	2,475	$	12
	Total temporarily impaired available-for-sale securities	$	2,475	$	12	$	—	$	—	$	2,475	$	12

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Summary of Major Categories of Loans Included in Loan Portfolio	Major categories of loans included in the loan portfolio as of December 31, 2014 and 2013 are:
			December 31,
			2014			2013
	Loans excluding PCI loans
	Real estate loans
	Residential		$	589,068		$	458,331
	Commercial			1,132,933			528,710
	Land, development and construction			79,002			62,503
	Total real estate			1,801,003			1,049,544
	Commercial			294,493			143,263
	Consumer and other loans			56,334			49,547
	Loans before unearned fees and deferred cost			2,151,830			1,242,354
	Net unearned fees and costs			929			404
	Total loans excluding PCI loans			2,152,759			1,242,758
	PCI loans (note 1)
	Real estate loans
	Residential			102,009			120,030
	Commercial			140,977			100,012
	Land, development and construction			24,032			6,381
	Total real estate			267,018			226,423
	Commercial			8,953			3,850
	Consumer and other loans			795			1,148
	Total PCI loans			276,766			231,421
	Total loans			2,429,525			1,474,179
	Allowance for loan losses for loans that are not PCI loans			(19,384	)		(19,694	)
	Allowance for loan losses for PCI loans			(514	)		(760	)
	Total loans, net of allowance for loan losses		$	2,409,627		$	1,453,725
	The following sets forth the covered FDIC loans included in the table above.
			December 31,
			2014			2013
	FDIC covered loans that are not PCI loans
	Real estate loans
	Residential		$	3,895		$	—
	Commercial			33,606			—
	Land, development and construction			866			—
	Total real estate			38,367			—
	Commercial			1,253			—
	Consumer and other loans			—			—
	FDIC covered loans, excluding PCI loans			39,620			—
	FDIC covered PCI loans (note 1)
	Real estate loans
	Residential			98,075			120,030
	Commercial			116,457			100,012
	Land, development and construction			15,395			6,381
	Total real estate			229,927			226,423
	Commercial			4,974			3,850
	Consumer and other loans			—			—
	Total FDIC covered PCI loans			234,901			230,273
	Total FDIC covered loans			274,521			230,273
	Allowance for loan losses for FDIC covered loans that are not PCI loans			—			—
	Allowance for loans losses for FDIC covered			(514	)		(760	)
	Total covered loans, net of allowance  for loan losses		$	274,007		$	229,513
Summary of Allowance for Loan Losses and Recorded Investment in Loans by Portfolio	Changes in the allowance for loan losses by portfolio segment for the years ended December 31, 2014, 2013 and 2012, are below.
			Real Estate Loans
			Residential			Commercial			Land, develop.,			Comm. &			Consumer & other			Total
									constr.			industrial
	Allowance for loan losses for loans that are not PCI loans:
	Twelve months ended December 31, 2014
	Beginning of the period		$	8,785		$	6,441		$	3,069		$	510		$	889		$	19,694
	Charge-offs			(1,382	)		(353	)		(124	)		(699	)		(879	)		(3,437	)
	Recoveries			1,018			763			106			85			184			2,156
	Provision for loan losses			(1,678	)		1,418			(2,299	)		2,434			1,096			971
	Balance at end of period		$	6,743		$	8,269		$	752		$	2,330		$	1,290		$	19,384
	Twelve months ended December 31, 2013
	Beginning of the period		$	6,831		$	8,272		$	6,211		$	1,745		$	974		$	24,033
	Charge-offs			(3,701	)		(1,144	)		(310	)		(120	)		(903	)		(6,178	)
	Recoveries			432			417			193			51			181			1,274
	Provision for loan losses			5,223			(1,104	)		(3,025	)		(1,166	)		637			565
	Balance at end of period		$	8,785		$	6,441		$	3,069		$	510		$	889		$	19,694
	Twelve months ended December 31, 2012
	Beginning of the period		$	6,700		$	8,825		$	9,098		$	1,984		$	952		$	27,559
	Charge-offs			(3,968	)		(2,862	)		(4,646	)		(231	)		(807	)		(12,514	)
	Recoveries			378			871			604			22			157			2,032
	Provision for loan losses			3,721			1,438			1,155			(30	)		672			6,956
	Balance at end of period		$	6,831		$	8,272		$	6,211		$	1,745		$	974		$	24,033
	Allowance for loan losses for loans that are PCI loans:
	Twelve months ended December 31, 2014
	Beginning of the period		$	—		$	138		$	89		$	533		$	—		$	760
	Charge-offs			—			—			—			(101	)		—			(101	)
	Recoveries			—			—			—			—			—			—
	Provision for loan losses			—			234			(83	)		(296	)		—			(145	)
	Balance at end of period		$	—		$	372		$	6		$	136		$	—		$	514
	Twelve months ended December 31, 2013
	Beginning of the period		$	—		$	2,335		$	—		$	314		$	—		$	2,649
	Charge-offs			—			(1,248	)		—			—			—			(1,248	)
	Recoveries			—			—			—			—			—			—
	Provision for loan losses			—			(949	)		89			219			—			(641	)
	Balance at end of period		$	—		$	138		$	89		$	533		$	—		$	760
	Twelve months ended December 31, 2012
	Beginning of the period		$	82		$	223		$	40		$	14		$	26		$	385
	Charge-offs			—			—			—			—			—			—
	Recoveries			—			—			—			—			—			—
	Provision for loan losses			(82	)		2,112			(40	)		300			(26	)		2,264
	Balance at end of period		$	—		$	2,335		$	—		$	314		$	-		$	2,649
Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method	The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of December 31, 2014 and 2013.  Accrued interest receivable and unearned fees/costs are not included in the recorded investment because they are not material.
		Real Estate Loans
	As of December 31, 2014		Residential			Commercial			Land,			Comm. &			Consumer			Total
									develop.,			industrial			& other
									constr.
	Allowance for loan losses:
	Ending allowance balance attributable to loans:
	Individually evaluated for impairment		$	419		$	403		$	272		$	4		$	17		$	1,115
	Collectively evaluated for impairment			6,324			7,866			480			2,326			1,273			18,269
	Purchased credit impaired			—			372			6			136			—			514
	Total ending allowance balance		$	6,743		$	8,641		$	758		$	2,466		$	1,290		$	19,898
	Loans:
	Individually evaluated for impairment		$	9,980		$	10,902		$	2,748		$	1,365		$	255		$	25,250
	Collectively evaluated for impairment			579,088			1,122,031			76,254			293,128			56,079			2,126,580
	Purchased credit impaired			102,009			140,977			24,032			8,953			795			276,766
	Total ending loan balances		$	691,077		$	1,273,910		$	103,034		$	303,446		$	57,129		$	2,428,596
		Real Estate Loans
	As of December 31, 2013		Residential			Commercial			Land,			Comm. &			Consumer			Total
									develop.,			industrial			& other
									constr.
	Allowance for loan losses:
	Ending allowance balance attributable to loans:
	Individually evaluated for impairment		$	395		$	1,377		$	16		$	2		$	21		$	1,811
	Collectively evaluated for impairment			8,390			5,064			3,053			508			868			17,883
	Purchased credit impaired			—			138			89			533			—			760
	Total ending allowance balance		$	8,785		$	6,579		$	3,158		$	1,043		$	889		$	20,454
	Loans:
	Individually evaluated for impairment		$	8,610		$	12,564		$	1,307		$	1,297		$	332		$	24,110
	Collectively evaluated for impairment			449,721			516,146			61,196			141,966			49,215			1,218,244
	Purchased credit impaired			120,030			100,012			6,381			3,850			1,148			231,421
	Total ending loan balance		$	578,361		$	628,722		$	68,884		$	147,113		$	50,695		$	1,473,775
Summary of Impaired Loans	The following is a summary of information regarding impaired loans at December 31, 2014 and 2013:
			December 31,
			2014			2013
	Performing TDRs (these are not included in nonperforming loans (“NPLs”))		$	11,418		$	10,763
	Nonperforming TDRs (these are included in NPLs)			3,648			4,684
	Total TDRs (these are included in impaired loans)			15,066			15,447
	Impaired loans that are not TDRs			10,184			8,663
	Total impaired loans		$	25,250		$	24,110
Troubled Debt Restructured Loans by Loans Type	TDRs as of December 31, 2014 and 2013 quantified by loan type classified separately as accrual (performing loans) and non-accrual (nonperforming loans) are presented in the table below.
	As of December 31, 2014		Accruing			Non Accrual			Total
	Real estate loans:
	Residential		$	7,201		$	1,523		$	8,724
	Commercial			2,762			1,794			4,556
	Land, development, construction			547			241			788
	Total real estate loans			10,510			3,558			14,068
	Commercial			706			37			743
	Consumer and other			202			53			255
	Total TDRs		$	11,418		$	3,648		$	15,066
	As of December 31, 2013		Accruing			Non-Accrual			Total
	Real estate loans:
	Residential		$	7,221		$	1,389		$	8,610
	Commercial			2,169			3,077			5,246
	Land, development, construction			608			47			655
	Total real estate loans			9,998			4,513			14,511
	Commercial			555			49			604
	Consumer and other			210			122			332
	Total TDRs		$	10,763		$	4,684		$	15,447
Summary of Loans by Class Modified	The following table presents loans by class modified as TDRs for which there was a payment default within twelve months following the modification during the years ending December 31, 2014 and 2013.
			Year Ending						Year Ending
			31-Dec-14						31-Dec-13
			Number			Recorded			Number			Recorded
			of loans			investment			of loans			investment
	Residential			1		$	188			3		$	562
	Commercial real estate			5			747			5			1,662
	Land, development, construction			2			241			—			—
	Commercial and Industrial			—			—			1			25
	Consumer and other			2			36			1			18
	Total			10		$	1,212			10		$	2,267
Summary of Loans Individually Evaluated for Impairment by Class of Loans	The following tables present loans individually evaluated for impairment by class of loans as of December 31, 2014 and 2013 excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30.  The recorded investment is less than the unpaid principal balance primarily due to partial charge-offs.
	As of December 31, 2014		Unpaid principal			Recorded investment			Allowance for loan losses allocated
			balance
	With no related allowance recorded:
	Residential real estate		$	6,797		$	6,672		$	—
	Commercial real estate			8,208			8,059			—
	Land, development, construction			2,234			1,606			—
	Commercial and industrial			1,132			1,129			—
	Consumer, other			—						—
	With an allowance recorded:
	Residential real estate			3,451			3,308			419
	Commercial real estate			3,024			2,843			403
	Land, development, construction			1,187			1,142			272
	Commercial and industrial			283			236			4
	Consumer, other			267			255			17
	Total		$	26,583		$	25,250		$	1,115
	As of December 31, 2013		Unpaid principal balance			Recorded investment			Allowance for loan losses allocated
	With no related allowance recorded:
	Residential real estate		$	5,052		$	4,803		$	—
	Commercial real estate			9,330			7,439			—
	Land, development, construction			1,377			1,168			—
	Commercial and industrial			1,330			1,241			—
	Consumer, other			5			5			—
	With an allowance recorded:
	Residential real estate			3,942			3,807			395
	Commercial real estate			5,257			5,125			1,377
	Land, development, construction			147			139			16
	Commercial and industrial			102			56			2
	Consumer, other			340			327			21
	Total		$	26,882		$	24,110		$	1,811
Summary of Impairment by Class of Loans
	December 31, 2014		Average of impaired loans			Interest income recognized during			Cash basis interest income
						impairment			recognized
	Real estate loans:
	Residential		$	9,584		$	318		$	—
	Commercial			12,282			145			—
	Land, development, construction			2,138			37			—
	Total real estate loans			24,004			500			—
	Commercial and industrial			2,001			67			—
	Consumer and other loans			296			12			—
	Total		$	26,301		$	579		$	—
	December 31, 2013		Average of impaired loans			Interest income recognized during impairment			Cash basis interest income recognized
	Real estate loans:
	Residential		$	8,968		$	290		$	—
	Commercial			26,060			870			—
	Land, development, construction			1,405			17			—
	Total real estate loans			36,433			1,177			—
	Commercial and industrial			1,878			35			—
	Consumer and other loans			363			11			—
	Total		$	38,674		$	1,223		$	—
	December 31, 2012		Average of impaired loans			Interest income recognized during impairment			Cash basis interest income recognized
	Real estate loans:
	Residential		$	10,136		$	306		$	—
	Commercial			29,877			1,215			—
	Land, development, construction			3,888			23			—
	Total real estate loans			43,901			1,544			—
	Commercial and industrial			4,175			110			—
	Consumer and other loans			439			17			—
	Total		$	48,515		$	1,671		$	—
Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due Over 90 Days Still on Accrual by Class of Loans	The following tables present the recorded investment in nonaccrual loans and loans past due over 90 days still on accrual by class of loans as of December 31, 2014 and 2013 excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30:
	As of December 31, 2014		Nonaccrual			Loans past due over 90 days still accruing
	Residential real estate		$	11,901		$	—
	Commercial real estate			8,470			—
	Land, development, construction			2,374			—
	Commercial			2,475			—
	Consumer, other			375			—
	Total		$	25,595		$	—
	As of December 31, 2013		Nonaccrual			Loans past due over 90 days still accruing
	Residential real estate		$	10,162		$	—
	Commercial real estate			13,925			—
	Land, development, construction			1,099			—
	Commercial			1,582			—
	Consumer, other			309			—
	Total		$	27,077		$	—
Summary Aging of Recorded Investment in Past Due Loans	The following tables present the aging of the recorded investment in past due loans as of December 31, 2014 and 2013, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30:
			Accruing Loans
			Total			30 - 59			60 - 89			Greater than			Total Past			Loans Not			Nonaccrual Loans
						days past			days past			90 days past			Due			Past Due
						due			due			due
	As of December 31, 2014
	Residential real estate		$	589,068		$	2,162		$	1,451		$	—		$	3,613		$	573,554		$	11,901
	Commercial real estate			1,132,933			1,840			3,394			—			5,234			1,119,229			8,470
	Land/dev/construction			79,002			378			404			—			782			75,846			2,374
	Commercial			294,493			1,427			1,492			—			2,919			289,099			2,475
	Consumer			56,334			411			149			—			560			55,399			375
			$	2,151,830		$	6,218		$	6,890		$	—		$	13,108		$	2,113,127		$	25,595
			Accruing Loans
			Total			30 - 59			60 - 89			Greater than			Total Past			Loans Not			Nonaccrual Loans
						days past			days past			90 days past			Due			Past Due
						due			due			due
	As of December 31, 2013
	Residential real estate		$	458,331		$	2,801		$	1,942		$	—		$	4,743		$	443,426		$	10,162
	Commercial real estate			528,710			2,420			1,941			—			4,361			510,424			13,925
	Land/dev/construction			62,503			136			241			—			377			61,027			1,099
	Commercial			143,263			491			1			—			492			141,189			1,582
	Consumer			49,547			295			240			—			535			48,703			309
			$	1,242,354		$	6,143		$	4,365		$	—		$	10,508		$	1,204,769		$	27,077
Risk Category of Loans by Class of Loans, Excluding Purchased Credit Impaired Loans
			As of December 31, 2014
	Loan Category		Pass			Special Mention			Substandard			Doubtful
	Residential real estate		$	558,312		$	7,053		$	23,703		$	—
	Commercial real estate			1,063,979			34,953			34,001			—
	Land/dev/construction			65,216			9,731			4,055			—
	Commercial			285,549			4,419			4,525			—
	Consumer			55,590			278			466			—
	Total		$	2,028,646		$	56,434		$	66,750		$	—
			As of December 31, 2013
	Loan Category		Pass			Special Mention			Substandard			Doubtful
	Residential real estate		$	428,671		$	6,438		$	23,222		$	—
	Commercial real estate			448,762			46,427			33,521			—
	Land/dev/construction			50,164			9,566			2,773			—
	Commercial			134,901			4,490			3,872			—
	Consumer			49,448			526			573			—
	Total		$	1,111,946		$	67,447		$	63,961		$	—
Investment in Residential and Consumer Loans, Excluding Loans from Purchased Credit Impaired Loans	The following table presents the recorded investment in residential and consumer loans, excluding purchased credit impaired loans accounted for pursuant to ASC Topic 310-30, based on payment activity as of December 31, 2014 and 2013:
	As of December 31, 2014		Residential			Consumer
	Performing		$	577,167		$	55,959
	Nonperforming			11,901			375
	Total		$	589,068		$	56,334
	As of December 31, 2013		Residential			Consumer
	Performing		$	448,169		$	49,238
	Nonperforming			10,162			309
	Total		$	458,331		$	49,547
Summary of Total Contractually Required Principal and Interest Cash Payments, Management's Estimate of Expected Total Cash Payments and Carrying Value of Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans as of December 31, 2014 and 2013.  Contractually required principal and interest payments have been adjusted for estimated prepayments.
			December 31,
			2014			2013			2012
	Contractually required principal and interest		$	460,836		$	389,537		$	534,989
	Non-accretable difference			(68,757	)		(55,304	)		(142,855	)
	Cash flows expected to be collected			392,079			334,233			392,134
	Accretable yield			(115,313	)		(102,812	)		(93,107	)
	Carrying value of acquired loans			276,766			231,421			299,027
	Allowance for loan losses			(514	)		(760	)		(2,649	)
	Carrying value less allowance for loan losses		$	276,252		$	230,661		$	296,378
Summary of Changes in Total Contractually Required Principal and Interest Cash Payments	The table below summarizes the changes in total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans during the periods ending December 31, 2014 and 2013.
						Effect of			income			all other
			December 31, 2013			acquisitions			accretion			adjustments			December 31, 2014
	Contractually required principal and interest		$	389,537		$	229,249		$	—		$	(157,950	)	$	460,836
	Non-accretable difference			(55,304	)		(45,293	)		—			31,840			(68,757	)
	Cash flows expected to be collected			334,233			183,956			—			(126,110	)		392,079
	Accretable yield			(102,812	)		(32,204	)		34,168			(14,465	)		(115,313	)
	Carry value of acquired loans		$	231,421		$	151,752		$	34,168		$	(140,575	)	$	276,766
							income			all other
				December 31, 2012			accretion			adjustments			December 31, 2013
	Contractually required principal and interest		$	534,989		$	—		$	(145,452	)	$	389,537
	Non-accretable difference			(142,855	)		—			87,551			(55,304	)
	Cash flows expected to be collected			392,134			—			(57,901	)		334,233
	Accretable yield			(93,107	)		32,725			(42,430	)		(102,812	)
	Carry value of acquired loans		$	299,027		$	32,725		$	(100,331	)	$	231,421

FDIC_Indemnification_Asset_Tab

FDIC Indemnification Asset (Tables)	12 Months Ended
	Dec. 31, 2014
Fdic Loss Share Indemnification Asset [Abstract]
FDIC Loss Share Indemnification Asset	The activity in the FDIC loss share indemnification asset is as follows (certain items related to true-up payment liabilities per the FDIC agreements, which had previously been netted with the FDIC indemnification asset, have been reclassified as a separate liability):
		2014			2013
	Beginning of the year	$	73,877		$	119,691
	Effect of acquisition		2,636			—
	Amortization, net		(20,664	)		(13,765	)
	Indemnification revenue		3,098			6,055
	Indemnification of foreclosure expense		237			4,413
	Proceeds from FDIC		(10,014	)		(42,004	)
	Impairment (recovery) of loan pool		(116	)		(513	)
	Period end balance	$	49,054		$	73,877
FDIC Activity In True-up Payment Liability	The activity in the true-up payment liability is as follows:
		2014			2013
	Beginning of the year	$	444		$	402
	Effect of acquisition		682			—
	True-up liability accrual		79			42
	Period end balance	$	1,205		$	444

Other_Real_Estate_Owned_Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2014
Real Estate [Abstract]
Activity of Valuation Allowance in Other Real Estate Owned and Expense Related to Foreclosed Assets	Other real estate owned means real estate acquired through or instead of loan foreclosure.  Activity in the valuation allowance was as follows:
		2014			2013			2012
	Beginning of year	$	5,887		$	5,407		$	4,680
	Valuation write down of repossessed real estate		3,250			6,012			4,258
	Sales and/or dispositions		(6,034	)		(5,532	)		(3,531	)
	End of year	$	3,103		$	5,887		$	5,407
	Expenses related to foreclosed real estate include:
		2014			2013			2012
	(Gain) loss on sale of repossessed real estate	$	(788	)	$	3,122		$	1,185
	Valuation write down of repossessed real estate		3,250			6,012			4,258
	Operating expenses, net of rental income		2,775			3,191			4,008
	Total	$	5,237		$	12,325		$	9,451

Fair_Value_Tables

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Derivatives Based on Valuation Models Using Observable Market Data as of the Measurement	The fair value of derivatives is based on valuation models using observable market data as of the measurement date (Level 2).
				Fair value measurements using
						Significant
				Quoted prices in		other				Significant
				active markets for		observable				unobservable
		Carrying		identical assets		inputs				inputs
		value		(Level 1)		(Level 2)				(Level 3)
	at December 31, 2014
	Assets:
	Trading securities	$	3,420	—		$	3,420			—
	Available for sale securities
	U.S. government sponsored entities and agencies		3	—			3			—
	Mortgage backed securities		478,633	—			478,633			—
	Municipal securities		38,821	—			38,821			—
	Interest rate swap derivatives		6,800	—			6,800			—
	Liabilities:
	Interest rate swap derivatives		7,575	—			7,575			—
	at December 31, 2013
	Assets:
	Trading securities	$      ---		—		$      ---				—
	Available for sale securities
	U.S. government sponsored entities and agencies		4	—			4			—
	Mortgage backed securities		416,881	—			416,881			—
	Municipal securities		40,201	—			40,201			—
	Interest rate swap derivatives		2,603	—			2,603			—
	Liabilities:
	Interest rate swap derivatives		2,496	—			2,496			—
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis	Assets and liabilities measured at fair value on a non-recurring basis are summarized below.
				Fair value measurements using
						Significant
				Quoted prices in		other		Significant
				active markets for		observable		unobservable
		Carrying		identical assets		inputs		inputs
		value		(Level 1)		(Level 2)		(Level 3)
	at December 31, 2014
	Assets:
	Impaired loans
	Residential real estate	$	2,971	—		—		$	2,971
	Commercial real estate		4,854	—		—			4,854
	Land, land development and construction		1,731	—		—			1,731
	Commercial		167	—		—			167
	Consumer		102	—		—			102
	Other real estate owned
	Residential real estate		448	—		—			448
	Commercial real estate		2,363	—		—			2,363
	Land, land development and construction		2,240	—		—			2,240
	Bank property held for sale		2,675	—		—			2,675
	at December 31, 2013
	Assets:
	Impaired loans
	Residential real estate	$	3,191	—		—		$	3,191
	Commercial real estate		7,515	—		—			7,515
	Land, land development and construction		290	—		—			290
	Commercial		731	—		—			731
	Consumer		157	—		—			157
	Other real estate owned
	Residential real estate		27	—		—			27
	Commercial real estate		3,837	—		—			3,837
	Land, land development and construction		3,949	—		—			3,949
	Bank property held for sale		1,582	—		—			1,582
Carrying Amounts and Estimated Fair Values of Company's Financial Instruments	The following table presents the carry amounts and estimated fair values of the Company’s financial instruments:
				Fair value measurements
	at December 31, 2014	Carrying amount		Level 1				Level 2			Level 3		Total
	Financial assets:
	Cash and cash equivalents	$	158,413	$	158,413			$	—		$	—	$	158,413
	Trading securities		3,420	—					3,420		—			3,420
	Investment securities available for sale		517,457	—					517,457		—			517,457
	Investment securities held to maturity		237,362	—					238,431		—			238,431
	FHLB and FRB stock		14,219	—					-		—		n/a
	Loans held for sale		1,251	—					1,251		—			1,251
	Loans, less allowance for loan losses of $19,898		2,409,627	—				—				2,418,405		2,418,405
	FDIC indemnification asset		49,054	—				—			—		n/a
	Interest rate swap derivatives		6,800	—					6,800		—			6,800
	Accrued interest receivable		8,999	—				—				8,999		8,999
	Financial liabilities:
	Deposits- without stated maturities	$	2,604,228	$	2,604,228			$	—		$	—	$	2,604,228
	Deposits- with stated maturities		487,812	—					491,999		—			491,999
	Securities sold under agreement to repurchase		27,022	—					27,022		—			27,022
	Federal funds purchased		151,992	—					151,992		—			151,992
	Corporate debentures		23,917	—					-			19,722		19,722
	Interest rate swap derivatives		7,575	—					7,575		—			7,575
	Accrued interest payable		336	—					336		—			336
				Fair value measurements
	at December 31, 2013	Carrying amount		Level 1				Level 2			Level 3		Total
	Financial assets:
	Cash and cash equivalents	$	174,889	$	174,889			$	—		$	—	$	174,889
	Investment securities available for sale		457,086	—					457,086		—			457,086
	FHLB and FRB stock		8,189	—				—			—		n/a
	Loans held for sale		1,010	—					1,010		—			1,010
	Loans, less allowance for loan losses of $20,454		1,453,725	—				—				1,456,295		1,456,295
	FDIC indemnification asset		73,877	—				—			—		n/a
	Interest rate swap derivatives		2,603	—					2,603		—			2,603
	Accrued interest receivable		6,337	—				—				6,337		6,337
	Financial liabilities:
	Deposits- without stated maturities	$	1,671,356	$	1,671,356			$	—		$	—	$	1,671,356
	Deposits- with stated maturities		384,875	—					389,115		—			389,115
	Securities sold under agreement to repurchase		20,457	—					20,457		—			20,457
	Federal funds purchased		29,909	—					29,909		—			29,909
	Corporate debentures		16,996	—				—				11,091		11,091
	Interest rate swap derivatives		2,496	—					2,496		—			2,496

Bank_Premises_and_Equipment_Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Summary of Bank Premises and Equipment	A summary of bank premises and equipment as of December 31, 2014 and 2013 is as follows:
		December 31,
		2014		2013
	Land	$	34,387	$	32,591
	Land improvements		949		864
	Buildings		60,168		56,651
	Leasehold improvements		3,520		2,450
	Furniture, fixtures and equipment		30,906		26,749
	Construction in progress		1,587		5,828
			131,517		125,133
	Less: Accumulated depreciation		32,669		28,514
		$	98,848	$	96,619
Minimum Future Contractual Annual Rentals	The Company leases land and certain facilities under noncancellable operating leases.  The following is a schedule of future minimum annual rentals under the noncancellable operating leases:
	Year ending December 31,
	2015	$	2,318
	2016		1,891
	2017		1,690
	2018		1,540
	2019		1,012
	Thereafter		4,929
		$	13,380

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Change in Balance for Goodwill	The change in balance for goodwill during the years 2014, 2013 and 2012 is as follows:
		2014			2013			2012
	Beginning of year	$	44,924		$	44,924		$	38,035
	Acquired goodwill		31,815			—			6,889
	Impairment		—			—			—
	End of year	$	76,739		$	44,924		$	44,924
Acquired Intangible Assets for Core Deposit Intangibles and Trust	The change in balance for CDI and the Trust during the years 2014, 2013 and 2012 is as follows:
		2014			2013			2012
	Beginning of year	$	6,116		$	7,307		$	5,203
	Acquired CDI		11,569			—			1,896
	Acquired Trust		—			—			1,580
	Amortization expense		(2,284	)		(1,191	)		(1,372	)
	Impairment expense		—			—			—
	End of year	$	15,401		$	6,116		$	7,307
Schedule of Acquired Intangible Assets	Acquired intangible assets were as follows for years ended December 31, 2014 and 2013:
		December 31, 2014						December 31, 2013
		Gross						Gross
		Carrying			Accumulated			Carrying			Accumulated
		Amount			Amortization			Amount			Amortization
	Amortized intangible assets:
	Core deposit intangibles	$	23,176		$	8,760		$	11,607		$	6,649
	Trust intangible		1,580			595			1,580			422
	Total acquired intangibles	$	24,756		$	9,355		$	13,187		$	7,071
Estimated Amortization Expense	Estimated amortization expense for each of the next five years:
	2015	$	2,529
	2016		2,269
	2017		1,876
	2018		1,724
	2019		1,669

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Banking And Thrift [Abstract]
Summary of Deposits	A detail of deposits at December 31, 2014 and 2013 is as follows:
		December 31,
				Weighted				Weighted
				Average				Average
				Interest				Interest
			2014	Rate			2013	Rate
	Non-interest bearing deposits	$	1,048,874	—	%	$	644,915	—	%
	Interest bearing deposits:
	Interest bearing demand deposits		607,359	0.1	%		483,842	0.1	%
	Savings deposits		231,039	0.1	%		232,942	0.1	%
	Money market accounts		716,956	0.3	%		309,657	0.2	%
	Time deposits less than $100,000		219,021	0.8	%		181,635	0.8	%
	Time deposits of $100,000 or greater		268,791	1.1	%		203,240	1.2	%
		$	3,092,040	0.2	%	$	2,056,231	0.2	%
Summary of Certificate Accounts	The following table presents the amount of certificate accounts at December 31, 2014, maturing during the periods reflected below:
	Year	Amount
	2015	$	320,629
	2016		91,988
	2017		35,948
	2018		17,902
	2019		21,344
	Thereafter		1
	Total	$	487,812

Securities_Sold_Under_Agreemen1

Securities Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2014
Banking And Thrift [Abstract]
Summary of Repurchase Agreement	Information concerning repurchase agreements is summarized as follows:
		2014			2013			2012
	Average daily balance during the year	$	30,289		$	21,693		$	21,388
	Average interest rate during the year		0.6	%		0.36	%		0.4	%
	Maximum month-end balance during the year	$	34,681		$	24,483		$	24,989
	Weighted average interest rate at year end		0.72	%		0.4	%		0.4	%

Federal_Funds_Purchased_Tables

Federal Funds Purchased (Tables)	12 Months Ended
	Dec. 31, 2014
Banking And Thrift [Abstract]
Federal Funds Purchased, Overnight Deposits from Correspondent Banks	Federal funds purchased, as listed below, are overnight deposits from correspondent banks.  Information concerning these deposits is summarized as follows:
		2014			2013			2012
	Average daily balance during the year	$	49,899		$	37,958		$	53,803
	Average interest rate during the period		0.1	%		0.05	%		0.05	%
	Maximum month-end balance during the year	$	151,992		$	53,274		$	82,473
	Weighted average interest rate at year end		0.29	%		0.05	%		0.05	%

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Allocation of Federal and State Income Tax Expense (Benefit) Between Current and Deferred Portions	Allocation of federal and state income tax expense between current and deferred portions for the years ended December 31, 2014, 2013 and 2012, is as follows:
			Current						Deferred		Total
	December 31, 2014:
	Federal		$	4,384			$	1,486			$	5,870
	State			1,009				247				1,256
			$	5,393			$	1,733			$	7,126
	December 31, 2013:
	Federal		$	4,423			$	27			$	4,450
	State			1,055			5					1,060
			$	5,478			$	32			$	5,510
	December 31, 2012:
	Federal		$	(32	)		$	3,761			$	3,729
	State		271						625			896
			$	239			$	4,386			$	4,625
Components of Deferred Tax Assets and Deferred Tax Liabilities	The tax effect of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2014 and 2013, are presented below:
		December 31,
		2014				2013
	Deferred tax assets:
	Allowance for loan losses	$	7,675			$	7,890
	Stock based compensation		771				469
	Deferred compensation		2,425				2,598
	Impairment expenses		463				403
	Net operating loss carryforward		20,308			—
	Other real estate owned expenses		2,391				3,074
	Fair value adjustments		18,386			—
	Nonaccrual interest		2,579				560
	Unrealized loss on investment securities available for sale	—					2,816
	Other		75				1,007
	Total deferred tax assets		55,073				18,817
	Deferred tax liabilities:
	Premises and equipment, due to differences in
	depreciation methods and useful lives		(2,264	)			(4,096	)
	Deferred loan costs, net		(358	)			(156	)
	Fair value adjustments	—					(8,937	)
	Like kind exchange		(300	)			(300	)
	Unrealized gain on investment securities available for sale		(2,548	)		—
	Accretion of discounts on investments		(16	)			(32	)
	Total deferred tax liabilities		(5,486	)			(13,521	)
	Net deferred tax asset	$	49,587			$	5,296
Summary of Net Operating Loss Carryforwards	At December 31, 2014, the Company had net operating carryforwards of approximately $52,645 which will begin to expire as follows.
	2029	$	2,105
	2030		27,889
	2031		10,463
	2032		2,028
	2033		4,027
	2034		6,133
		$	52,645
Reconciliation Between the Actual Tax Expense and the Expected Tax (Benefit) Expense	A reconciliation between the actual tax expense and the “expected” tax expense, computed by applying the U.S. federal corporate rate of 35 percent (34 percent for 2012) is as follows:
			December 31,
			2014				2013			2012
	“Expected” tax (benefit) expense		$	7,032			$	6,214		$	4,940
	Tax exempt interest, net			(910	)			(907	)		(925	)
	Bank owned life insurance			(549	)			(391	)		(412	)
	State income taxes, net of federal income tax benefits			817				689			591
	Stock based compensation			83				100			104
	Merger and acquisition related expenses			536				68			259
	Other, net			117				(263	)		68
			$	7,126			$	5,510		$	4,625

RelatedParty_Transactions_Tabl

Related-Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Summary Loans to Principal Officers, Directors and Their Affiliates	Loans to principal officers, directors, and their affiliates during 2014 and 2013 were as follows:
		2014			2013
	Beginning balance	$	3,261		$	3,957
	New loans		4,135			2,354
	Effect of changes in composition of related parties		—			—
	Repayments		(1,816	)		(3,050	)
	Ending balance	$	5,580		$	3,261

Regulatory_Capital_Matters_Tab

Regulatory Capital Matters (Tables)

12 Months Ended

Dec. 31, 2014

Banking And Thrift [Abstract]

Summary of Actual, Required, and Capital Levels Necessary for Capital Adequacy Purposes

A summary of actual, required, and capital levels necessary for capital adequacy purposes for the Company as of December 31, 2014 and 2013, are presented in the table below.  There is no threshold for “well-capitalized” status for bank holding companies.

To be well

capitalized under

For capital

Prompt corrective

Actual

Adequacy purposes

action provision

Amount

Ratio

Amount

Ratio

Amount

Ratio

31-Dec-14

Total capital (to risk weighted assets)

$

384,162

15.10%

$

202,946

>8%

n/a

n/a

Tier 1 capital (to risk weighted assets)

364,264

14.40%

101,473

>4%

n/a

n/a

Tier 1 capital (to average assets)

364,264

10.10%

144,051

>4%

n/a

n/a

31-Dec-13

Total capital (to risk weighted assets)

$

262,701

17.90%

$

117,450

>8%

n/a

n/a

Tier 1 capital (to risk weighted assets)

244,323

16.60%

58,725

>4%

n/a

n/a

Tier 1 capital (to average assets)

244,323

10.40%

94,182

>4%

n/a

n/a

A summary of actual, required, and capital levels necessary for capital adequacy purposes in the case of the Company’s subsidiary bank as of December 31, 2014 and 2013, are presented in the table below.

To be well

capitalized under

For capital

Prompt corrective

Actual

Adequacy purposes

action provision

Amount

Ratio

Amount

Ratio

Amount

Ratio

31-Dec-14

Total capital (to risk weighted assets)

$

360,278

14.20%

$

203,268

>8%

$

254,085

>10%

Tier 1 capital (to risk weighted assets)

340,389

13.40%

101,634

>4%

152,451

>6%

Tier 1 capital (to average assets)

340,389

9.40%

144,185

>4%

180,231

>5%

31-Dec-13

Total capital (to risk weighted assets)

$

213,744

14.60%

$

117,021

>8%

$

146,277

>10%

Tier 1 capital (to risk weighted assets)

195,434

13.40%

58,511

>4%

87,766

>6%

Tier 1 capital (to average assets)

195,434

8.30%

93,955

>4%

117,444

>5%

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Stock Based Compensation Expense Recognized	The Company’s stock-based compensation consists of stock options, RSAs and PSUs.  During the twelve month period ended December 31, 2014, 2013 and 2012, the Company recognized total stock-based compensation expense as listed in the table below.
			2014			2013				2012
	Stock option expense		$	238		$	292			$	363
	RSA expense			1,264			317				268
	PSU expense			75			—				—
	Total stock-based compensation expense		$	1,577		$	609			$	631
Summary of Estimated Fair Value of Options Granted Weighted-Average Assumptions	The weighted-average assumptions as of the grant date are as follows:
			2014			2013				2012
	Expected option life			0.5 years			7.7 years				7.7 years
	Risk-free interest rate			0.07	%		1.91	%			1.08	%
	Expected volatility			0.01	%		44.5	%			44.3	%
	Dividend yield			0	%		0.39	%			0.62	%
Information Related to Stock Option Activity	The table below present’s information related to stock option activity for the years ended December 31, 2014, 2013 and 2012:
			2014			2013				2012
	Total intrinsic value of stock options exercised		$	1,114		$	2			$	—
	Cash received from stock options exercised		$	1,129			—				—
	Gross income tax benefit from the exercise of stock options		$	350			—				—
Summary of Stock Option Activity	A summary of stock option activity for the years ended December 31, 2014, 2013 and 2012 is as follows:
			December 31, 2014							December 31, 2013							December 31, 2012
						Weighted-								Weighted-						Weighted-
						Average								Average						Average
			Number of			Exercise				Number of				Exercise			Number of			Exercise
			Options			Price				Options				Price			Options			Price
	Outstanding, beginning of period			1,073,716		$	13.83				1,158,646			$	13.64			1,128,304		$	14.03
	Granted			—			—				3,000			$	10.22			57,500		$	6.87
	Issued Gulfstream (note 1)			774,104		$	6.99				—				—			—			—
	Exercised			(233,762	)	$	6.09				(1,714	)		$	8.9			—			—
	Forfeited			(475,654	)	$	12.73				(86,216	)		$	11.22			(27,158	)	$	15.33
	Outstanding, end of period			1,138,404		$	11.23				1,073,716			$	13.83			1,158,646		$	13.64
	note 1:	Pursuant to the Company’s agreement to acquire Gulfstream in January 2014, all outstanding Gulfstream stock options were converted to CenterState stock options as of the acquisition date.
								Weighted-				Weighted-
								Average				Average				Aggregate
				Number of				Exercise						Contractual		Intrinsic
				Options				Price						Term		Value
	Options outstanding, December 31, 2014				1,138,404			$	11.23				4.2 years			$	2,558
	Options fully vested and expected to vest, December 31, 2014				1,099,700			$	11.21				4.2 years			$	2,499
	Options exercisable, December 31, 2014				864,249			$	10.92				4.1 years			$	2,180
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Restricted Stock Awards Activity	A summary of the RSA activity for the years ended December 31, 2014, 2013 and 2012 is presented in the table below.
			2014														2013					2012
				Number			Number
				of RSAs			of RSAs								Weighted						Weighted					Weighted
				underlying			underlying				Total				average						average					average
				shares not			shares				number				fair value at			Number			fair value at		Number		fair value at
			issued			issued				of RSAs				grant date			of RSAs			grant date		of RSAs			grant date
	Outstanding, beginning period			240,341			—				240,341			$	9.76			209,384		$	9.62		179,152		$	10.53
	Granted			241,739			250,375				492,114			$	10.55			59,500		$	10.22		54,500		$	6.87
	Vested			(35,753	)		(833	)			(36,586	)		$	9.77			(28,543	)	$	9.66		(24,268	)	$	10.19
	Forfeited			(36,199	)		—				(36,199	)		$	10.79			—			—		—			—
	Outstanding, end of period			410,128			249,542				659,670			$	10.3			240,341		$	9.76		209,384		$	9.62

Parent_Company_Only_Financial_1

Parent Company Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet	Condensed financial statements of CenterState Banks, Inc. (parent company only) follow:
	Condensed Balance Sheet
	December 31, 2014 and 2013
	Assets:	2014			2013
	Cash and due from banks	$	2,808		$	966
	Inter-company receivable from bank subsidiary		27,000			45,703
	Investment in wholly-owned bank subsidiary		441,710			241,990
	Investment in other wholly-owned subsidiary		1,381			2,322
	Prepaid expenses and other assets		9,782			3,995
	Total assets	$	482,681		$	294,976
	Liabilities:
	Accounts payable and accrued expenses	$	6,287		$	4,601
	Corporate debenture		23,917			16,996
	Total liabilities		30,204			21,597
	Stockholders’ Equity:
	Common stock		453			301
	Additional paid-in capital		388,698			229,544
	Retained earnings		59,273			48,018
	Accumulated other comprehensive income		4,053			(4,484	)
	Total stockholders’ equity		452,477			273,379
	Total liabilities and stockholders’ equity	$	482,681		$	294,976
Condensed Statements of Operations
	Condensed Statements of Operations
	Years ended December 31, 2014, 2013 and 2012
		2014			2013			2012
	Dividend income	$	1,155		$	45,725		$	12,282
	Other income		—			—			5
	Interest expense		(942	)		(602	)		(835	)
	Operating expenses		(3,875	)		(3,538	)		(3,142	)
	Income before equity in undistributed income of subsidiaries		(3,662	)		41,585			8,310
	Equity in undistributed (losses) income of subsidiaries		14,828			(31,040	)		147
	Net income before income tax benefit		11,166			10,545			8,457
	Income tax benefit		(1,798	)		(1,697	)		(1,448	)
	Net income	$	12,964		$	12,243		$	9,905
Condensed Statements of Cash Flows	Condensed Statements of Cash Flows
	Years ended December 31, 2014, 2013 and 2012
		2014			2013			2012
	Cash flows from operating activities:
	Net income	$	12,964		$	12,243		$	9,905
	Adjustments to reconcile net income to net cash used in operating activities:
	Equity in net earnings of subsidiaries		(15,983	)		(14,686	)		(12,429	)
	Increase in payables and accrued expenses		(608	)		371			893
	Decrease (increase) in other assets		2,294			1,843			(1,164	)
	Stock based compensation expense		497			107			142
	Net cash flows used in operating activities		(836	)		(122	)		(2,653	)
	Cash flows from investing activities:
	Inter-company receivables from subsidiary banks		18,703			(43,703	)		17,000
	Net cash from bank acquisition		(16,455	)		—			—
	Investment in subsidiaries		—			—			(28,000	)
	Dividends from bank subsidiaries		—			34,000			10,000
	Dividends from nonbank subsidiary		1,155			11,725			2,282
	Net cash flows provided by investing activities		3,403			2,022			1,282
	Cash flows from financing activities:
	Stock options exercised, net of tax benefit		984			––			––
	Dividends paid to shareholders		(1,709	)		(1,204	)		(1,203	)
	Net cash flows used in financing activities		(725	)		(1,204	)		(1,203	)
	Net increase (decrease) in cash and cash equivalents		1,842			696			(2,574	)
	Cash and cash equivalents at beginning of year		966			270			2,844
	Cash and cash equivalents at end of year	$	2,808		$	966		$	270

Credit_Commitments_Tables

Credit Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Summary of Credit Commitments	A summary of commitments to extend credit and standby letters of credit written at December 31, 2014 and 2013, are as follows:
		December 31,
		2014		2013
	Standby letters of credit	$	10,299	$	6,769
	Available lines of credit		244,016		143,199
	Unfunded loan commitments – fixed		62,450		9,004
	Unfunded loan commitments – variable		17,416		14,179

Basic_and_Diluted_Earnings_Per1

Basic and Diluted Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Factors Used in Earnings Per Share Computations	The following table presents the factors used in the earnings per share computations for the periods indicated.
		2014	2013	2012
	Basic
	Net income available to common shareholders	$12,964	$12,243	$9,905
	Less: Earnings allocated to participating securities	-17	—	—
	Net income allocated to common shareholders	$12,947	$12,243	$9,905
	Weighted average common shares outstanding
	including participating securities	40,904,988	30,102,777	30,073,959
	Less: Participating securities	-52,986	—	—
	Average shares	40,852,002	30,102,777	30,073,959
	Basic earnings per common share	$0.32	$0.41	$0.33
	Diluted
	Net income available to common shareholders	$12,947	$12,243	$9,905
	Weighted average common shares outstanding for
	basic earnings per common share	40,852,002	30,102,777	30,073,959
	Add: Dilutive effects of stock based compensation awards	383,550	117,350	67,904
	Average shares and dilutive potential common shares	41,235,552	30,220,127	30,141,863
	Dilutive earnings per common share	$0.31	$0.41	$0.33

Reportable_Segments_Tables

Reportable Segments (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Reconciliation of Reportable Segment Revenues, Expenses and Profit	The tables below are reconciliations of the reportable segment revenues, expenses, and profit as viewed by management to the Company’s consolidated total for the year ending December 31, 2014, 2013 and 2012.
		Year ending December 31, 2014
					Correspondent			Corporate
		Commercial			banking and			overhead
		and retail			capital markets			and			Elimination
		banking			division			administration			entries			Total
	Interest income	$	134,938		$	3,289		$	—		$	—		$	138,227
	Interest expense		(6,365	)		(50	)		(941	)		—			(7,356	)
	Net interest income (expense)	$	128,573		$	3,239		$	(941	)		—		$	130,871
	Provision for loan losses		(826	)		—			—			—			(826	)
	Non interest income		6,073			20,153			—			—			26,226
	Non interest expense		(112,836	)		(19,470	)		(3,875	)		—			(136,181	)
	Net income (loss) before taxes	$	20,984		$	3,922		$	(4,816	)		—		$	20,090
	Income tax (provision) benefit		(7,411	)		(1,513	)		1,798			—			(7,126	)
	Net income (loss)	$	13,573		$	2,409		$	(3,018	)	$	—		$	12,964
	Total assets	$	3,487,014		$	280,079		$	482,681		$	(472,905	)	$	3,776,869
		Year ending December 31, 2013
					Correspondent			Corporate
		Commercial			banking and			overhead
		and retail			capital markets			and			Elimination
		banking			division			administration			entries			Total
	Interest income	$	97,504		$	2,874		$	—					$	100,378
	Interest expense		(5,263	)		(20	)		(602	)					(5,885	)
	Net interest income (expense)		92,241			2,854			(602	)					94,493
	Provision for loan losses		76			—			—						76
	Other non interest income		13,536			20,410			—						33,946
	Other non interest expense		(86,726	)		(20,498	)		(3,538	)					(110,762	)
	Net income (loss) before taxes		19,127			2,766			(4,140	)					17,753
	Income tax (provision) benefit		(6,140	)		(1,067	)		1,697						(5,510	)
	Net income (loss)	$	12,987		$	1,699		$	(2,443	)				$	12,243
	Total assets	$	2,279,221		$	132,821		$	294,976		$	(291,007	)	$	2,416,011
		Year ending December 31, 2012
					Correspondent			Corporate
		Commercial			banking and			overhead
		and retail			capital markets			and			Elimination
		banking			division			administration			entries			Total
	Interest income	$	90,899		$	4,051								$	94,950
	Interest expense		(7,617	)		(28	)		(836	)					(8,481	)
	Net interest income (expense)		83,282			4,023			(836	)					86,469
	Provision for loan losses		(9,220	)		—									(9,220	)
	Other non interest income		23,550			35,707			4						59,261
	Other non interest expense		(90,671	)		(28,168	)		(3,141	)					(121,980	)
	Net income (loss) before taxes		6,941			11,562			(3,973	)					14,530
	Income tax (provision) benefit		(1,722	)		(4,351	)		1,448						(4,625	)
	Net income (loss)	$	5,219		$	7,211		$	(2,525	)				$	9,905
	Total assets	$	2,204,176		$	153,289		$	294,744		$	(288,969	)	$	2,363,240

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2014
Gulfstream Bancshares, Inc. [Member]
Summary of Purchase Price Calculation	The table below summarizes the purchase price calculation.
	Number of shares of Gulfstream common stock outstanding at January 16, 2014		1,569,364
	Gulfstream preferred shares that converted to Gulfstream common shares upon a change in control		155,629
	Total Gulfstream common shares including conversion of preferred shares		1,724,993
	Per share exchange ratio		3.012
	Number of shares of CenterState common stock less 138 of fractional shares		5,195,541
	Multiplied by CenterState common stock price per share on January 16, 2014	$	10.23
	Fair value of CenterState common stock issued	$	53,150
	Total Gulfstream common shares including conversion of preferred shares		1,724,993
	Multiplied by the cash consideration each Gulfstream share is entitled to receive	$	14.65
	Total cash consideration, not including cash for fractional shares	$	25,271
	Total stock consideration	$	53,150
	Total cash consideration plus $2 for 138 of fractional shares		25,273
	Total consideration paid to Gulfstream common shareholders	$	78,423
	Fair value of current Gulfstream stock options converted to CenterState stock options		3,617
	Total purchase price	$	82,040
Summary of Preliminary Estimates of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed	The list below summarizes the estimates of the fair value of the assets purchased, including goodwill, and liabilities assumed as of the January 17, 2014 purchase date.
		Jan 17, 2014
	Assets:
	Cash and cash equivalents	$	102,278
	Loans, held for investment		329,515
	Purchased credit impaired loans		30,068
	Loans held for sale		247
	Investments		60,816
	Interest receivable		1,087
	Branch real estate		5,519
	Furniture and fixtures		262
	FHLB stock		885
	Bank owned life insurance		4,939
	Other repossessed real estate owned		2,694
	Core deposit intangible		4,173
	Goodwill		31,516
	Other assets		11,261
	Total assets acquired	$	585,260
	Liabilities:
	Deposits	$	478,999
	Federal Home Loan Bank advances		5,708
	Repurchase agreements		7,576
	Interest payable		125
	Official checks outstanding		826
	Corporate debentures		6,745
	Other liabilities		3,241
	Total liabilities assumed	$	503,220
Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of January 17, 2014 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments.
	Contractually required principal and interest	$	48,289
	Non-accretable difference		(11,766	)
	Cash flows expected to be collected		36,523
	Accretable yield		(6,455	)
	Total purchased credit-impaired loans acquired	$	30,068
Summary of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date.
		Book			Fair
		Balance			Value
	Loans:
	Single family residential real estate	$	33,506		$	32,319
	Commercial real estate		185,250			183,189
	Construction/development/land		30,387			27,704
	Commercial loans		85,940			84,203
	Consumer and other loans		2,112			2,100
	Purchased credit-impaired		40,655			30,068
	Total earning assets	$	377,850		$	359,583
Schedule of Measurement Period Adjustments	Based on appraisals received subsequent to the acquisition date, the Company adjusted its initial fair value estimates of certain other real estate owned acquired.
		Jan 17, 2014			measurement			Jan 17, 2014
		(as initially reported)			period			(as adjusted)
					adjustments
	Assets:
	Cash and cash equivalents	$	102,278		$	—		$	102,278
	Loans, held for investment		329,515						329,515
	Purchased credit impaired loans		30,068						30,068
	Loans held for sale		247						247
	Investments		60,816						60,816
	Interest receivable		1,087						1,087
	Branch real estate		5,519						5,519
	Furniture and fixtures		262						262
	FHLB stock		885						885
	Bank owned life insurance		4,939						4,939
	Other repossessed real estate owned		3,365			(671	)		2,694
	Core deposit intangible		4,173						4,173
	Goodwill		31,104			412			31,516
	Other assets		11,002			259			11,261
	Total assets acquired	$	585,260		$	—		$	585,260
	Liabilities:
	Deposits	$	478,999		$	—		$	478,999
	Federal Home Loan Bank advances		5,708						5,708
	Repurchase agreements		7,576						7,576
	Interest payable		125						125
	Official checks outstanding		826						826
	Corporate debenture		6,745						6,745
	Other liabilities		3,241						3,241
	Total liabilities assumed	$	503,220		$	—		$	503,220
First Southern Bancorp, Inc. [Member]
Summary of Purchase Price Calculation	The table below summarizes the purchase price calculation.
	Number of shares of FSB common stock outstanding at May 30, 2014		31,539,698
	FSB preferred shares that converted to FSB common shares upon a change in control		48,375
	Total FSB common shares including conversion of preferred shares		31,588,073
	Per share exchange ratio		0.3
	Number of shares of CenterState common stock, less 377 of fractional shares		9,476,045
	Multiplied by CenterState common stock price per share on May 30, 2014	$	10.62
	Fair value of CenterState common stock issued	$	100,636
	Total FSB common shares including conversion of preferred shares		31,588,073
	Multiplied by the cash consideration each FSB share is entitled to receive	$	3
	Total cash consideration, not including cash for fractional shares	$	94,765
	Total stock consideration	$	100,636
	Total cash consideration, plus $3 for 377 of fractional shares		94,768
	Total purchase price	$	195,404
Summary of Preliminary Estimates of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed	The list below summarizes the preliminary estimates of the fair value of the assets purchased, including goodwill, and liabilities assumed as of the June 1, 2014 purchase date.
		June 1, 2014
	Assets:
	Cash and cash equivalents	$	148,257
	Loans, excluding purchased credit impaired loans		477,841
	Purchased credit impaired loans		121,684
	Investments		204,723
	Interest receivable		2,007
	Branch real estate		1,594
	Furniture and fixtures		1,282
	Bank property held for sale		7,119
	Federal Reserve Bank and Federal Home Loan Bank stock		5,576
	Bank owned life insurance		2,555
	Other repossessed real estate owned covered by FDIC loss share agreements		22,731
	Other repossessed real estate owned		454
	Core deposit intangible		7,396
	Goodwill		299
	Deferred tax asset		44,131
	Other assets		4,581
	Total assets acquired	$	1,052,230
	Liabilities:
	Deposits	$	662,959
	Deposits held for sale		189,674
	Interest payable		58
	Other liabilities		4,135
	Total liabilities assumed	$	856,826
Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of June 1, 2014 for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments.
	Contractually required principal and interest	$	180,960
	Non-accretable difference		(33,527	)
	Cash flows expected to be collected		147,433
	Accretable yield		(25,749	)
	Total purchased credit-impaired loans acquired	$	121,684
Summary of Fair Value of Acquired Loans and Unpaid Principal Balance	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance (“Book Balance”) at acquisition date.
		Book			Fair
		Balance			Value
	Loans:
	Single family residential real estate	$	60,332		$	57,693
	Commercial real estate		387,589			382,162
	Construction/development/land		17,238			15,942
	Commercial loans		20,267			19,906
	Consumer and other loans		2,496			2,138
	Purchased credit-impaired		142,414			121,684
	Total earning assets	$	630,336		$	599,525
Schedule of Measurement Period Adjustments	Based on income tax returns filed subsequent to the acquisition date, the Company adjusted its initial fair value estimate of the deferred tax asset acquired.
		June 1, 2014			measurement			June 1, 2014
		(as initially reported)			period			(as adjusted)
					adjustments
	Assets:
	Cash and cash equivalents	$	148,257		$	—		$	148,257
	Loans, excluding purchased credit impaired loans		477,841						477,841
	Purchased credit impaired loans		121,684						121,684
	Investments		204,723						204723
	Interest receivable		2,007						2,007
	Branch real estate		1,594						1,594
	Furniture and fixtures		1,282						1,282
	Bank property held for sale		7,119						7119
	Federal Reserve Bank and Federal Home Loan Bank stock		5,576						5576
	Bank owned life insurance		2,555						2,555
	OREO covered by FDIC loss share agreements		22,731						22,731
	Other repossessed real estate owned (“OREO”)		454						454
	Core deposit intangible		7,396						7,396
	Goodwill		541			(242	)		299
	Deferred tax asset		43,889			242			44,131
	Other assets		4,581						4,581
	Total assets acquired	$	1,052,230			—		$	1,052,230
	Liabilities:
	Deposits		662,959						662,959
	Federal Home Loan Bank advances		189,674						189674
	Repurchase agreements		58						58
	Other liabilities		4,135						4,135
	Total liabilities assumed	$	856,826		$	—		$	856,826
First Southern Bank Inc And Gulfstream Bancshares Inc [Member]
Pro-Forma Financial Information of Acquisition	Pro-forma data for the twelve month period ending December 31, 2013 listed in the table below presents pro-forma information as if the Gulfstream acquisition occurred at the beginning of 2013. Because the Gulfstream transaction closed on January 17, 2014 and its actual results are included in the Company’s actual operating results for 2014, its actual results were used in the table below for the twelve month period ending December 31, 2014 instead of a pro-forma amount.   The pro-forma information for the twelve month periods ending December 31, 2014 and 2013 assumes the FSB acquisition occurred at the beginning of 2013.
		Years ended December 31,
		2014			2013
	Net interest income	$	143,527		$	153,719
	Net income available to common shareholders		20,066			21,390
	EPS - basic	$	0.45		$	0.48
	EPS - diluted	$	0.44		$	0.47

Derivatives_Tables

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary Information about the Derivative Instruments	Summary information about the derivative instruments is as follows:
		2014			2013
	Notional amount	$	240,779		$	91,058
	Weighted average pay rate on interest-rate swaps		3.96	%		4.34	%
	Weighted average receive rate on interest rate swaps		1.5	%		1.71	%
	Weighted average maturity (years)		11			10
	Fair value of interest rate swap derivatives (asset)	$	6,800		$	2,603
	Fair value of interest rate swap derivatives (liability)	$	7,575		$	2,496

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2013
	Segments	Pools	Bank	Bank
		Segments
		Location
		County
Financing Receivable Allowance For Credit Losses [Line Items]
Number of service banking locations		58
Number of counties		20
Interest bearing deposits in other financial institutions, Maximum maturity period		1 year
Loans maximum value to be monitored by payment history for nonaccrual status	$500	$500
Loans minimum value of commercial, land, development and construction loans to be monitored for nonaccrual status	500	500
Non real estate consumer loans typically charged off		120 days
Number of pools of loans with common risk characteristics for each FDIC failed institution acquired		10
Loans individually evaluated for impairment	25,250	25,250			24,110
Number of loan portfolio segments	6	5
Number of failed banks acquired			2	3
Tax benefit likelihood percentage		50.00%
First Southern Bancorp, Inc. [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Number of failed banks acquired		2
Core Deposits [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Useful life of intangible assets		10 years
Buildings [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Useful life of assets		39 years
Minimum [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for impairment	$500	$500
Majority loans terms		3 years
Useful life of intangible assets		3 years
Range of discount rates				1.21%
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Useful life of assets		3 years
Maximum [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Majority loans terms		5 years
Useful life of intangible assets		5 years
Range of discount rates				4.53%
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Useful life of assets		15 years

Trading_Securities_Trading_Sec

Trading Securities - Trading Securities Portfolio Realized and Unrealized Gains and Losses (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Beginning balance		$5,048
Purchases	171,089	198,186	367,105
Proceeds from sales	-167,838	-203,489	-362,747
Net realized gain on sales	156	255
Mark-to- market adjustment	13
Ending balance	$3,420		$5,048

Investment_Securities_Availabl

Investment Securities Available for Sale - Fair Value of Available for Sale Securities and Related Gross Unrealized Gains and Losses Recognized in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$510,859	$464,386
Gross Unrealized Gains	8,309	5,544
Gross Unrealized Losses	1,711	12,844
Fair Value	517,457	457,086
Obligations of U.S. government sponsored entities and agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3	4
Fair Value	3	4
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	473,396	424,654
Gross Unrealized Gains	6,897	4,623
Gross Unrealized Losses	1,660	12,396
Fair Value	478,633	416,881
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	37,460	39,728
Gross Unrealized Gains	1,412	921
Gross Unrealized Losses	51	448
Fair Value	$38,821	$40,201

Investment_Securities_Availabl1

Investment Securities Available for Sale - Schedule of Sales of Available for Sale Securities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Proceeds	$323,537	$69,495	$168,809
Gross gains	1,175	1,060	2,706
Gross losses	$1,129		$283

Investment_Securities_Availabl2

Investment Securities Available for Sale - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Security	Security
Investments Debt And Equity Securities [Abstract]
Tax provision related to net realized gains	$18	$409	$912
Securities estimated fair value	$139,297	$108,528
Number of securities representing specified criteria	0	0
Percentage of AFS securities held by any one issuer as a percentage of stockholders' equity	10.00%	10.00%
Percentage of mortgage-backed securities held from U.S. government-sponsored entities and agencies	100.00%

Investment_Securities_Availabl3

Investment Securities Available for Sale - Fair Value and Amortized Cost of Investment Securities by Contractual Maturity (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments Debt And Equity Securities [Abstract]
Investment securities available for sale, Due in one year or less, Fair Value	$532
Investment securities available for sale, Due after one year through five years, Fair Value	1,565
Investment securities available for sale, Due after five years through ten years, Fair Value	17,262
Investment securities available for sale, Due after ten years through thirty years, Fair Value	19,465
Investment securities available for sale, Mortgage backed securities, Fair Value	478,633
Fair Value	517,457	457,086
Investment securities available for sale, Due in one year or less, Amortized Cost	517
Investment securities available for sale, Due after one year through five years, Amortized Cost	1,498
Investment securities available for sale, Due after five years through ten years, Amortized Cost	16,638
Investment securities available for sale, Due after ten years through thirty years, Amortized Cost	18,810
Investment securities available for sale, Mortgage backed securities, Amortized Cost	473,396
Amortized Cost	$510,859	$464,386

Investment_Securities_Availabl4

Investment Securities Available for Sale - Investments Gross Unrealized Losses and Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$15,876	$239,641
Less than 12 months, Unrealized Losses	41	10,221
12 months or more, Fair Value	99,010	18,793
12 months or more, Unrealized Losses	1,619	2,175
Total, Fair Value	114,886	258,434
Total, Unrealized Losses	1,660	12,396
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value		7,603
Less than 12 months, Unrealized Losses		333
12 months or more, Fair Value	3,194	1,010
12 months or more, Unrealized Losses	51	115
Total, Fair Value	3,194	8,613
Total, Unrealized Losses	51	448
Total Temporarily Impaired Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	15,876	247,244
Less than 12 months, Unrealized Losses	41	10,554
12 months or more, Fair Value	102,204	19,803
12 months or more, Unrealized Losses	1,670	2,290
Total, Fair Value	118,080	267,047
Total, Unrealized Losses	$1,711	$12,844

Investment_Securities_Held_to_

Investment Securities Held to Maturity - Fair Value of Held to Maturity Securities and Related Gross Unrecognized Gains and Losses Recognized in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$237,362
Gross Unrecognized Gains	1,080
Gross Unrecognized Losses	12
Held-to-maturity securities, fair value	238,431	0
Obligations of U.S. government sponsored entities and agencies [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	49,793
Gross Unrecognized Gains	122
Held-to-maturity securities, fair value	49,915
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	161,727
Gross Unrecognized Gains	653
Held-to-maturity securities, fair value	162,381
Municipal Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	25,842
Gross Unrecognized Gains	305
Gross Unrecognized Losses	12
Held-to-maturity securities, fair value	$26,135

Investment_Securities_Held_to_1

Investment Securities Held to Maturity - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	Security	Security
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity securities pledged, estimated fair value	$51,531	$0
Number of securities representing specified criteria	0	0
Percentage of HTM securities held by any one issuer as a percentage of stockholders' equity	10.00%
Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Number of securities representing specified criteria	0

Investment_Securities_Held_to_2

Investment Securities Held to Maturity - Fair Value and Amortized Cost of Investment Securities by Contractual Maturity (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments Debt And Equity Securities [Abstract]
Investment securities available for sale, Due after five years through ten years, Fair Value	$44,515
Investment securities available for sale, Due after ten years through thirty years, Fair Value	31,535
Investment securities available for sale, Mortgage backed securities, Fair Value	162,381
Held-to-maturity securities, fair value	238,431	0
Investment securities available for sale, Due after five years through ten years, Amortized Cost	44,393
Investment securities available for sale, Due after ten years through thirty years, Amortized Cost	31,242
Investment securities available for sale, Mortgage backed securities, Amortized Cost	161,727
Amortized Cost	$237,362

Investment_Securities_Held_to_3

Investment Securities Held to Maturity - Investments Gross Unrecognized Losses and Fair Value (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Municipal Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	$2,475
Less than 12 months, Unrecognized Losses	12
Total, Fair Value	2,475
Total, Unrecognized Losses	12
Total Temporarily Impaired Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	2,475
Less than 12 months, Unrecognized Losses	12
Total, Fair Value	2,475
Total, Unrecognized Losses	$12

Loans_Summary_of_Information_C

Loans - Summary of Information Concerning Loan Portfolio by Collateral Types (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Receivables with Imputed Interest [Line Items]
Total loans excluding purchased credit impaired loans	$2,152,759	$1,242,758
Consumer and other loans	276,766	231,421
Total loans	2,429,525	1,474,179
Net Loans	2,409,627	1,453,725
FDIC Covered Loans Excluding Purchased Credit Impaired Loans [Member]
Receivables with Imputed Interest [Line Items]
Real estate loans, Residential	3,895
Real estate loans, Commercial	33,606
Land, development and construction	866
Total real estate	38,367
Commercial	1,253
Total loans excluding purchased credit impaired loans	39,620
FDIC Covered Loans Purchased Credit Impaired Loans [Member]
Receivables with Imputed Interest [Line Items]
Real estate loans, Residential	98,075	120,030
Real estate loans, Commercial	116,457	100,012
Land, development and construction	15,395	6,381
Total real estate	229,927	226,423
Commercial	4,974	3,850
Total FDIC covered PCI loans	234,901	230,273
Allowance for loans losses for FDIC covered PCI loans	-514	-760
Total covered loans, net of allowance for loan losses	274,007	229,513
F D I C Covered Loans [Member]
Receivables with Imputed Interest [Line Items]
Total FDIC covered loans	274,521	230,273
Allowance for loan losses for loans that are not PCI loans [Member]
Receivables with Imputed Interest [Line Items]
Real estate loans, Residential	589,068	458,331
Real estate loans, Commercial	1,132,933	528,710
Land, development and construction	79,002	62,503
Total real estate	1,801,003	1,049,544
Commercial	294,493	143,263
Consumer and other loans	56,334	49,547
Loans before unearned fees and deferred cost	2,151,830	1,242,354
Net unearned fees and costs	929	404
Allowance for loan losses for loans that are not PCI loans	-19,384	-19,694	-24,033	-27,559
Allowance for loan losses on PCI loans [Member]
Receivables with Imputed Interest [Line Items]
Real estate loans, Residential	102,009	120,030
Real estate loans, Commercial	140,977	100,012
Land, development and construction	24,032	6,381
Total real estate	267,018	226,423
Commercial	8,953	3,850
Consumer and other loans	795	1,148
Total PCI loans	276,766	231,421
Allowance for loan losses for loans that are not PCI loans	-19,384	-19,694
Allowance for loan losses for PCI loans	($514)	($760)	($2,649)	($385)

Loans_Summary_of_Allowance_for

Loans - Summary of Allowance for Loan Losses and Recorded Investment in Loans by Portfolios (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable Allowance For Credit Losses [Line Items]
Recoveries	$0	$0	$0
Provision for loan losses	826	-76	9,220
Allowance for loan losses for loans that are not PCI loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning of the period	19,694	24,033	27,559
Charge-offs	-3,437	-6,178	-12,514
Recoveries	2,156	1,274	2,032
Provision for loan losses	971	565	6,956
Balance at end of period, not purchased credit impaired	19,384	19,694	24,033
Allowance for loan losses for loans that are not PCI loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning of the period	8,785	6,831	6,700
Charge-offs	-1,382	-3,701	-3,968
Recoveries	1,018	432	378
Provision for loan losses	-1,678	5,223	3,721
Balance at end of period, not purchased credit impaired	6,743	8,785	6,831
Allowance for loan losses for loans that are not PCI loans [Member] | Land, Development, Construction [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning of the period	3,069	6,211	9,098
Charge-offs	-124	-310	-4,646
Recoveries	106	193	604
Provision for loan losses	-2,299	-3,025	1,155
Balance at end of period, not purchased credit impaired	752	3,069	6,211
Allowance for loan losses for loans that are not PCI loans [Member] | Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning of the period	510	1,745	1,984
Charge-offs	-699	-120	-231
Recoveries	85	51	22
Provision for loan losses	2,434	-1,166	-30
Balance at end of period, not purchased credit impaired	2,330	510	1,745
Allowance for loan losses for loans that are not PCI loans [Member] | Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning of the period	889	974	952
Charge-offs	-879	-903	-807
Recoveries	184	181	157
Provision for loan losses	1,096	637	672
Balance at end of period, not purchased credit impaired	1,290	889	974
Allowance for loan losses on PCI loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning of the period	19,694
Charge-offs	-101	-1,248
Provision for loan losses	-145	-641	2,264
Balance at end of period, not purchased credit impaired	19,384	19,694
Beginning of the period	760	2,649	385
Balance at end of period, purchased credit impaired	514	760	2,649
Allowance for loan losses on PCI loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for loan losses			-82
Beginning of the period			82
Allowance for loan losses on PCI loans [Member] | Land, Development, Construction [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for loan losses	-83	89	-40
Beginning of the period	89		40
Balance at end of period, purchased credit impaired	6	89
Allowance for loan losses on PCI loans [Member] | Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs	-101
Provision for loan losses	-296	219	300
Beginning of the period	533	314	14
Balance at end of period, purchased credit impaired	136	533	314
Allowance for loan losses on PCI loans [Member] | Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for loan losses			-26
Beginning of the period			26
Commercial Real Estate [Member] | Allowance for loan losses for loans that are not PCI loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning of the period	6,441	8,272	8,825
Charge-offs	-353	-1,144	-2,862
Recoveries	763	417	871
Provision for loan losses	1,418	-1,104	1,438
Balance at end of period, not purchased credit impaired	8,269	6,441	8,272
Commercial Real Estate [Member] | Allowance for loan losses on PCI loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs		-1,248
Provision for loan losses	234	-949	2,112
Beginning of the period	138	2,335	223
Balance at end of period, purchased credit impaired	$372	$138	$2,335

Loans_Allowance_for_Loan_Losse

Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Allowance for loan losses:
Individually evaluated for impairment	$1,115	$1,811
Collectively evaluated for impairment	18,269	17,883
Purchased credit impaired	514	760
Total ending allowance balance	19,898	20,454
Loans:
Individually evaluated for impairment	25,250	24,110
Collectively evaluated for impairment	2,126,580	1,218,244
Purchased credit impaired	276,766	231,421
Total ending loan balances	2,428,596	1,473,775
Residential Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	419	395
Collectively evaluated for impairment	6,324	8,390
Total ending allowance balance	6,743	8,785
Loans:
Individually evaluated for impairment	9,980	8,610
Collectively evaluated for impairment	579,088	449,721
Purchased credit impaired	102,009	120,030
Total ending loan balances	691,077	578,361
Land, Development, Construction [Member]
Allowance for loan losses:
Individually evaluated for impairment	272	16
Collectively evaluated for impairment	480	3,053
Purchased credit impaired	6	89
Total ending allowance balance	758	3,158
Loans:
Individually evaluated for impairment	2,748	1,307
Collectively evaluated for impairment	76,254	61,196
Purchased credit impaired	24,032	6,381
Total ending loan balances	103,034	68,884
Commercial and Industrial [Member]
Allowance for loan losses:
Individually evaluated for impairment	4	2
Collectively evaluated for impairment	2,326	508
Purchased credit impaired	136	533
Total ending allowance balance	2,466	1,043
Loans:
Individually evaluated for impairment	1,365	1,297
Collectively evaluated for impairment	293,128	141,966
Purchased credit impaired	8,953	3,850
Total ending loan balances	303,446	147,113
Consumer and Other [Member]
Allowance for loan losses:
Individually evaluated for impairment	17	21
Collectively evaluated for impairment	1,273	868
Total ending allowance balance	1,290	889
Loans:
Individually evaluated for impairment	255	332
Collectively evaluated for impairment	56,079	49,215
Purchased credit impaired	795	1,148
Total ending loan balances	57,129	50,695
Commercial Real Estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	403	1,377
Collectively evaluated for impairment	7,866	5,064
Purchased credit impaired	372	138
Total ending allowance balance	8,641	6,579
Loans:
Individually evaluated for impairment	10,902	12,564
Collectively evaluated for impairment	1,122,031	516,146
Purchased credit impaired	140,977	100,012
Total ending loan balances	$1,273,910	$628,722

Loans_Additional_Information_D

Loans - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans [Line Items]
Provision for loan loss expense	$422	$890
Loans modification, modified terms allowance period minimum	12 years
Loans modification, modified terms allowance period maximum	24 years
Troubled debt restructured loans total	15,066	15,447
Performing TDRs (these are not included in nonperforming loans ("NPLs"))	11,418	10,763
Nonperforming TDRs (these are included in NPLs)	3,648	4,684
Partial charge offs for troubled debt restructured	251	449
Percentage of troubled debt restructured current pursuant to modified terms	76.00%
Non performing TDRs	3,648	4,684
Percentage of troubled debt restructured not performing pursuant to their modified terms	24.00%
Provision for loan loss expense within twelve months	97	574
Partial charge offs for troubled debt restructured	65	197
Loan receivable modification, Specific reserve for customers	779	703
Allowances for loan losses	826	-76	9,220
Reversals in loan loss allowance for recoveries	0	0	0
Non-accretable expected cash flows	14,892
Income accretion	34,168
Allowance for loan losses on PCI loans [Member]
Loans [Line Items]
Allowances for loan losses	-145	-641	2,264
First Southern Bank Inc [Member]
Loans [Line Items]
Fair value adjustment for loans	9,725
Fair value adjustment for loans, percentage	2.00%
Provision for loan loss expense	$0

Loans_Summary_of_Impaired_Loan

Loans - Summary of Impaired Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Impaired Financing Receivable [Abstract]
Performing TDRs (these are not included in nonperforming loans ("NPLs"))	$11,418	$10,763
Nonperforming TDRs (these are included in NPLs)	3,648	4,684
Total TDRs (these are included in impaired loans)	15,066	15,447
Impaired loans that are not TDRs	10,184	8,663
Total impaired loans	$25,250	$24,110

Loans_Troubled_Debt_Restructur

Loans - Troubled Debt Restructured Loans by Loans Type (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]
Performing TDRs	$11,418	$10,763
Non performing TDRs	3,648	4,684
Total TDRs	15,066	15,447
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Performing TDRs	2,762	2,169
Non performing TDRs	1,794	3,077
Total TDRs	4,556	5,246
Commercial Loans and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Performing TDRs	706	555
Non performing TDRs	37	49
Total TDRs	743	604
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Performing TDRs	7,201	7,221
Non performing TDRs	1,523	1,389
Total TDRs	8,724	8,610
Land, Development, Construction [Member]
Financing Receivable, Modifications [Line Items]
Performing TDRs	547	608
Non performing TDRs	241	47
Total TDRs	788	655
Total Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Performing TDRs	10,510	9,998
Non performing TDRs	3,558	4,513
Total TDRs	14,068	14,511
Consumer and Other [Member]
Financing Receivable, Modifications [Line Items]
Performing TDRs	202	210
Non performing TDRs	53	122
Total TDRs	$255	$332

Loans_Summary_of_Loans_by_Clas

Loans - Summary of Loans by Class Modified (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	SecurityLoan	SecurityLoan
Mortgage Loans on Real Estate [Line Items]
Number of loans	10	10
Recorded investment	$1,212	$2,267
Commercial Real Estate [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans	5	5
Recorded investment	747	1,662
Residential Real Estate [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans	1	3
Recorded investment	188	562
Land, Development, Construction [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans	2
Recorded investment	241
Commercial Loans and Industrial [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans		1
Recorded investment		25
Consumer and Other [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans	2	1
Recorded investment	$36	$18

Loans_Summary_of_Loans_Individ

Loans - Summary of Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$26,583	$26,882
Total impaired loans	25,250	24,110
Amount of allowance for loan losses allocated to impaired loans	1,115	1,811
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	8,208	9,330
Unpaid principal balance, With an allowance recorded	3,024	5,257
Recorded investment, With no related allowance	8,059	7,439
Recorded investment, With an allowance recorded	2,843	5,125
Amount of allowance for loan losses allocated to impaired loans	403	1,377
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	6,797	5,052
Unpaid principal balance, With an allowance recorded	3,451	3,942
Recorded investment, With no related allowance	6,672	4,803
Recorded investment, With an allowance recorded	3,308	3,807
Amount of allowance for loan losses allocated to impaired loans	419	395
Land, Development, Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	2,234	1,377
Unpaid principal balance, With an allowance recorded	1,187	147
Recorded investment, With no related allowance	1,606	1,168
Recorded investment, With an allowance recorded	1,142	139
Amount of allowance for loan losses allocated to impaired loans	272	16
Commercial Loans and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded	1,132	1,330
Unpaid principal balance, With an allowance recorded	283	102
Recorded investment, With no related allowance	1,129	1,241
Recorded investment, With an allowance recorded	236	56
Amount of allowance for loan losses allocated to impaired loans	4	2
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, With no allowance recorded		5
Unpaid principal balance, With an allowance recorded	267	340
Recorded investment, With no related allowance		5
Recorded investment, With an allowance recorded	255	327
Amount of allowance for loan losses allocated to impaired loans	$17	$21

Loans_Summary_of_Impairment_by

Loans - Summary of Impairment by Class of Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	$26,301	$38,674	$48,515
Interest income recognized during impairment	579	1,223	1,671
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	12,282	26,060	29,877
Interest income recognized during impairment	145	870	1,215
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	9,584	8,968	10,136
Interest income recognized during impairment	318	290	306
Land, Development, Construction [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	2,138	1,405	3,888
Interest income recognized during impairment	37	17	23
Total Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	24,004	36,433	43,901
Interest income recognized during impairment	500	1,177	1,544
Commercial Loans and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	2,001	1,878	4,175
Interest income recognized during impairment	67	35	110
Consumer and Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Average of impaired loans during the period	296	363	439
Interest income recognized during impairment	$12	$11	$17

Loans_Summary_of_Recorded_Inve

Loans - Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due Over 90 Days Still on Accrual by Class of Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual, Total	$25,595	$27,077
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual, Total	8,470	13,925
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual, Total	11,901	10,162
Land, Development, Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual, Total	2,374	1,099
Commercial Loans and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual, Total	2,475	1,582
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual, Total	$375	$309

Loans_Summary_Aging_of_Recorde

Loans - Summary Aging of Recorded Investment in Past Due Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$2,151,830	$1,242,354
30 - 59 days past due	6,218	6,143
60 - 89 days past due	6,890	4,365
Total Past Due	13,108	10,508
Loans Not Past Due	2,113,127	1,204,769
Nonaccrual Loans	25,595	27,077
Commercial Loans and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	294,493	143,263
30 - 59 days past due	1,427	491
60 - 89 days past due	1,492	1
Total Past Due	2,919	492
Loans Not Past Due	289,099	141,189
Nonaccrual Loans	2,475	1,582
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	589,068	458,331
30 - 59 days past due	2,162	2,801
60 - 89 days past due	1,451	1,942
Total Past Due	3,613	4,743
Loans Not Past Due	573,554	443,426
Nonaccrual Loans	11,901	10,162
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,132,933	528,710
30 - 59 days past due	1,840	2,420
60 - 89 days past due	3,394	1,941
Total Past Due	5,234	4,361
Loans Not Past Due	1,119,229	510,424
Nonaccrual Loans	8,470	13,925
Land, Development, Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	79,002	62,503
30 - 59 days past due	378	136
60 - 89 days past due	404	241
Total Past Due	782	377
Loans Not Past Due	75,846	61,027
Nonaccrual Loans	2,374	1,099
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	56,334	49,547
30 - 59 days past due	411	295
60 - 89 days past due	149	240
Total Past Due	560	535
Loans Not Past Due	55,399	48,703
Nonaccrual Loans	$375	$309

Loans_Risk_Category_of_Loans_b

Loans - Risk Category of Loans by Class of Loans, Excluding Purchased Credit Impaired Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$589,068	$458,331
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	56,334	49,547
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,028,646	1,111,946
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,063,979	448,762
Pass [Member] | Commercial Loans and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	285,549	134,901
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	558,312	428,671
Pass [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	65,216	50,164
Pass [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	55,590	49,448
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	56,434	67,447
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	34,953	46,427
Special Mention [Member] | Commercial Loans and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,419	4,490
Special Mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,053	6,438
Special Mention [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,731	9,566
Special Mention [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	278	526
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	66,750	63,961
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	34,001	33,521
Substandard [Member] | Commercial Loans and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,525	3,872
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	23,703	23,222
Substandard [Member] | Land, Development, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,055	2,773
Substandard [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$466	$573

Loans_Investment_in_Residentia

Loans - Investment in Residential and Consumer Loans, Excluding Loans from Purchased Credit Impaired Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$589,068	$458,331
Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	577,167	448,169
Residential Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	11,901	10,162
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	56,334	49,547
Consumer and Other [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	55,959	49,238
Consumer and Other [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$375	$309

Loans_Summary_of_Total_Contrac

Loans - Summary of Total Contractually Required Principal and Interest Cash Payments, Management's Estimate of Expected Total Cash Payments and Carrying Value of Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
Contractually required principal and interest	$460,836	$389,537	$534,989
Non-accretable difference	-68,757	-55,304	-142,855
Cash flows expected to be collected	392,079	334,233	392,134
Accretable yield	-115,313	-102,812	-93,107
Carrying value of acquired loans	276,766	231,421	299,027
Allowance for loan losses	-514	-760	-2,649
Carrying value less allowance for loan losses	$276,252	$230,661	$296,378

Loans_Summary_of_Changes_in_To

Loans - Summary of Changes in Total Contractually Required Principal and Interest Cash Payments (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Contractually required principal and interest, beginning balance	$389,537		$534,989
Non-accretable difference, beginning balance	-55,304		-142,855
Cash flows expected to be collected, beginning balance	334,233		392,134
Accretable yield, beginning balance	-102,812		-93,107
Carrying value of acquired loans	231,421		299,027
Income accretion	34,168
Contractually required principal and interest, ending balance	460,836		534,989
Non-accretable difference, ending balance	-68,757		-142,855
Cash flows expected to be collected, ending balance	392,079		392,134
Accretable yield, ending balance	-115,313		-93,107
Carrying value of acquired loans	276,766		299,027
Contractually Required Principal and Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Contractually required principal and interest, beginning balance	389,537	534,989
Effect of acquisitions	229,249
All other adjustments	-157,950	-145,452
Contractually required principal and interest, ending balance	460,836	389,537
Non-Accretable Difference [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-accretable difference, beginning balance	-55,304	-142,855
Effect of acquisitions	-45,293
All other adjustments	31,840	87,551
Non-accretable difference, ending balance	-68,757	-55,304
Cash Flows Expected to be Collected [Member]
Financing Receivable, Recorded Investment [Line Items]
Cash flows expected to be collected, beginning balance	334,233	392,134
Effect of acquisitions	183,956
All other adjustments	-126,110	-57,901
Cash flows expected to be collected, ending balance	392,079	334,233
Accretable Yield [Member]
Financing Receivable, Recorded Investment [Line Items]
Accretable yield, beginning balance	-102,812	-93,107
Effect of acquisitions	-32,204
Income accretion	34,168	32,725
All other adjustments	-14,465	-42,430
Accretable yield, ending balance	-115,313	-102,812
Carry Value of Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Carrying value of acquired loans	231,421	299,027
Effect of acquisitions	151,752
Income accretion	34,168	32,725
All other adjustments	-140,575	-100,331
Carrying value of acquired loans	$276,766	$231,421

FDIC_Indemnification_Asset_Add

FDIC Indemnification Asset - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
	Bank		Bank	Bank
Fdic Indemnification Asset [Abstract]
Number of acquisitions under agreement	2		2	3
Federal Deposit Insurance Corporation reimbursable expenses	($116)	($513)

FDIC_Indemnification_Asset_FDI

FDIC Indemnification Asset - FDIC Loss Share Indemnification Asset (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fdic Loss Share Indemnification Asset [Abstract]
Beginning of the year	$73,877	$119,691
Effect of acquisition	2,636
Amortization, net	-20,664	-13,765
Indemnification revenue	3,098	6,055
Indemnification of foreclosure expense	237	4,413
Proceeds from FDIC	-10,014	-42,004	-21,787
Impairment (recovery) of loan pool	-116	-513
Period end balance	$49,054	$73,877	$119,691

FDIC_Indemnification_Asset_FDI1

FDIC Indemnification Asset - FDIC Activity In True-up Payment Liability (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fdic Loss Share Indemnification Asset [Abstract]
Beginning of the year	$444	$402
Effect of acquisition	682
True-up liability accrual	79	42
Period end balance	$1,205	$444

Other_Real_Estate_Owned_Activi

Other Real Estate Owned - Activity of Valuation Allowance in Other Real Estate Owned and Expense Related to Foreclosed Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate [Abstract]
Beginning of year	$5,887	$5,407	$4,680
Valuation write down of repossessed real estate (“OREO”)	3,250	6,012	4,258
Sales and/or dispositions	-6,034	-5,532	-3,531
End of year	3,103	5,887	5,407
Expenses related to foreclosed real estate include:
(Gain)/loss on sale of repossessed real estate (“OREO”)	-788	3,122	1,185
Valuation write down of repossessed real estate (“OREO”)	3,250	6,012	4,258
Operating expenses, net of rental income	2,775	3,191	4,008
Total	$5,237	$12,325	$9,451

Fair_Value_Additional_Informat

Fair Value - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Branch
	Property
	Office
Fair Value Inputs Assets Quantitative Information [Line Items]
Impaired loans with allocated allowance for loan losses	$10,677	$13,528
Impaired valuation allowance	852	1,644
Provision for loan loss expense	554	1,895
Repossessed real estate owned valuation write down	3,250	6,012	4,258
Number of branches closed	8
Company owned branches	7
Company leased branches	1
Number properties owned by the Company were transferred to held for sale	5
Number of loan production office	2
Impairment charges recognized	1,753
Additional impairment charges	649
Impairment charges recognized	$1,152
Minimum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Capitalization rates to determine fair value of collateral	8.00%
Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Capitalization rates to determine fair value of collateral	11.00%

Fair_Value_Fair_Value_Derivati

Fair Value - Fair Value Derivatives Based on Valuation Models Using Observable Market Data as of the Measurement (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:
Trading securities, at fair value	$3,420		$5,048
Available for sale securities	517,457	457,086
Mortgage Backed Securities [Member]
Assets:
Available for sale securities	478,633	416,881
Municipal Securities [Member]
Assets:
Available for sale securities	38,821	40,201
Fair Value Measurements on Recurring [Member]
Assets:
Trading securities, at fair value	3,420
Interest rate swap derivatives, carrying amount assets	6,800	2,603
Liabilities:
Interest rate swap derivatives, carrying amount liability	7,575	2,496
Fair Value Measurements on Recurring [Member] | Obligations of U.S. government sponsored entities and agencies [Member]
Assets:
Available for sale securities	3	4
Fair Value Measurements on Recurring [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale securities	478,633	416,881
Fair Value Measurements on Recurring [Member] | Municipal Securities [Member]
Assets:
Available for sale securities	38,821	40,201
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Trading securities, at fair value	3,420
Available for sale securities	517,457	457,086
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements on Recurring [Member]
Assets:
Trading securities, at fair value	3,420
Interest rate swap derivatives, carrying amount assets	6,800	2,603
Liabilities:
Interest rate swap derivatives, carrying amount liability	7,575	2,496
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements on Recurring [Member] | Obligations of U.S. government sponsored entities and agencies [Member]
Assets:
Available for sale securities	3	4
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements on Recurring [Member] | Mortgage Backed Securities [Member]
Assets:
Available for sale securities	478,633	416,881
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements on Recurring [Member] | Municipal Securities [Member]
Assets:
Available for sale securities	$38,821	$40,201

Fair_Value_Assets_and_Liabilit

Fair Value - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans on Residential real estate at Carrying value	$2,971	$3,191
Impaired loans on Commercial real estate at Carrying value	4,854	7,515
Impaired loans on Land, land development and construction at Carrying value	1,731	290
Impaired loans on Commercial at Carrying value	167	731
Impaired loans on Consumer at Carrying value	102	157
Other real estate owned on Residential real estate at Carrying value	448	27
Other real estate owned on Commercial real estate at Carrying value	2,363	3,837
Other real estate owned on Land, land development and construction at Carrying value	2,240	3,949
Bank owned real estate held for sale	2,675	1,582
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans on Residential real estate	2,971	3,191
Impaired loans on Commercial real estate	4,854	7,515
Impaired loans on Land, land development and construction	1,731	290
Impaired loans on Commercial	167	731
Impaired loans on Consumer	102	157
Other real estate owned on Residential real estate	448	27
Other real estate owned on Commercial real estate	2,363	3,837
Other real estate owned on Land, land development and construction	2,240	3,949
Bank owned real estate held for sale	$2,675	$1,582

Fair_Value_Carrying_Amounts_an

Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financial assets:
Cash and cash equivalents	$158,413	$174,889	$136,748	$151,095
Cash and cash equivalents, fair value	158,413	174,889
Trading securities, at fair value	3,420		5,048
Investment securities available for sale, at fair value	517,457	457,086
Investment securities held to maturity, carrying amount	237,362
Investment securities held to maturity, at fair value	238,431	0
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	14,219	8,189
Loans held for sale, carrying amount	1,251	1,010
Loans held for sale, fair value	1,251	1,010
Loans, less allowance for loan losses, carrying amount	2,409,627	1,453,725
Loans, less allowance for loan losses, fair value	2,418,405	1,456,295
FDIC indemnification asset, carrying amount	49,054	73,877	119,691
Interest rate swap derivatives, carrying amount assets	6,800	2,603
Interest rate swap derivatives, assets fair value	6,800	2,603
Accrued interest receivable, carrying amount	8,999	6,337
Accrued interest receivable, fair value	8,999	6,337
Financial liabilities:
Deposits- without stated maturities, carrying amount	2,604,228	1,671,356
Deposits- without stated maturities, fair value	2,604,228	1,671,356
Deposits- with stated maturities, carrying amount	487,812	384,875
Deposits- with stated maturities, fair value	491,999	389,115
Securities sold under agreement to repurchase, fair value	27,022	20,457
Securities sold under agreement to repurchase	27,022	20,457
Federal funds purchased, carrying amount	151,992	29,909
Corporate debentures, carrying amount	23,917	16,996
Federal funds purchased, fair value	151,992	29,909
Interest rate swap derivatives, carrying amount	7,575	2,496
Corporate debentures, fair value	19,722	11,091
Accrued interest payable, carrying amount	336	333
Interest rate swap derivatives, fair value	7,575	2,496
Accrued interest payable, fair value	336
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents, fair value	158,413	174,889
Financial liabilities:
Deposits- without stated maturities, fair value	2,604,228	1,671,356
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Trading securities, at fair value	3,420
Investment securities available for sale, at fair value	517,457	457,086
Investment securities held to maturity, at fair value	238,431
Loans held for sale, fair value	1,251	1,010
Interest rate swap derivatives, assets fair value	6,800	2,603
Financial liabilities:
Deposits- with stated maturities, fair value	491,999	389,115
Securities sold under agreement to repurchase, fair value	27,022	20,457
Federal funds purchased, fair value	151,992	29,909
Interest rate swap derivatives, fair value	7,575	2,496
Accrued interest payable, fair value	336
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Loans, less allowance for loan losses, fair value	2,418,405	1,456,295
Accrued interest receivable, fair value	8,999	6,337
Financial liabilities:
Corporate debentures, fair value	$19,722	$11,091

Fair_Value_Carrying_Amounts_an1

Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]
Deduction of Allowance for loan losses from loans	$19,898	$20,454

Bank_Premises_and_Equipment_Su

Bank Premises and Equipment - Summary of Bank Premises and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	$131,517	$125,133
Less: Accumulated depreciation	32,669	28,514
Bank premises and equipment, Net	98,848	96,619
Land [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	34,387	32,591
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	949	864
Buildings [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	60,168	56,651
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	3,520	2,450
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	30,906	26,749
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	$1,587	$5,828

Bank_Premises_and_Equipment_Mi

Bank Premises and Equipment - Minimum Future Contractual Annual Rentals (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Property Plant And Equipment [Abstract]
2015	$2,318
2016	1,891
2017	1,690
2018	1,540
2019	1,012
Thereafter	4,929
Total	$13,380

Bank_Premises_and_Equipment_Ad

Bank Premises and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment [Abstract]
Rental expense, net	$2,309	$1,099	$1,455
Annual rental income	$632	$540	$507

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Change in Balance for Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning of year	$44,924	$38,035
Acquired goodwill	31,815	6,889
End of year	$76,739	$44,924

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Amortized period on accelerated basis	10 years

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Acquired Intangible Assets for Core Deposit Intangibles and Trust (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Beginning of year	$6,116	$7,307	$5,203
Acquired	24,756	13,187
Amortization expense	-2,284	-1,191	-1,372
End of year	15,401	6,116	7,307
Core Deposits [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired	11,569		1,896
Trust [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired			$1,580

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Amortized intangible assets:
Core deposit intangibles, Gross Carrying Amount	$23,176	$11,607
Trust Intangible, Gross Carrying Amount	1,580	1,580
Total acquired intangibles, Gross Carrying Amount	24,756	13,187
Core deposit intangibles, Accumulated Amortization	8,760	6,649
Trust intangible, Accumulated Amortization	595	422
Total acquired intangibles, Accumulated Amortization	$9,355	$7,071

Goodwill_and_Intangible_Assets6

Goodwill and Intangible Assets - Estimated Amortization Expense (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]
2015	$2,529
2016	2,269
2017	1,876
2018	1,724
2019	$1,669

Deposits_Summary_of_Deposits_D

Deposits - Summary of Deposits (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking And Thrift [Abstract]
Non-interest bearing deposits	$1,048,874	$644,915
Interest bearing deposits:
Interest bearing demand deposits	607,359	483,842
Savings deposits	231,039	232,942
Money market accounts	716,956	309,657
Time deposits less than $100,000	219,021	181,635
Time deposits of $100,000 or greater	268,791	203,240
Total deposits	$3,092,040	$2,056,231
Interest bearing demand deposits, weighted average interest rate	0.10%	0.10%
Savings deposits, weighted average interest rate	0.10%	0.10%
Money market accounts, weighted average interest rate	0.30%	0.20%
Time deposits less than $100,000, weighted average interest rate	0.80%	0.80%
Time deposits of $100,000 or greater, weighted average interest rate	1.10%	1.20%
Total deposits, weighted average interest rate	0.20%	0.20%

Deposits_Summary_of_Certificat

Deposits - Summary of Certificate Accounts (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking And Thrift [Abstract]
2015	$320,629
2016	91,988
2017	35,948
2018	17,902
2019	21,344
Thereafter	1
Total	$487,812	$384,875

Deposits_Additional_Informatio

Deposits - Additional Information (Detail) (FDIC [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
FDIC [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Time deposits of $250 thousands or greater	$116,861	$83,335

Securities_Sold_Under_Agreemen2

Securities Sold Under Agreements to Repurchase - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking And Thrift [Abstract]
Repurchase Agreement entered by entity	$27,022	$20,457
Collateral pledged against repurchase agreement	$52,714	$37,845

Securities_Sold_Under_Agreemen3

Securities Sold Under Agreements to Repurchase - Summary of Repurchase Agreement (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Banking And Thrift [Abstract]
Average daily balance during the year	$30,289	$21,693	$21,388
Average interest rate during the year	0.60%	0.36%	0.40%
Maximum month-end balance during the year	$34,681	$24,483	$24,989
Weighted average interest rate at year end	0.72%	0.40%	0.40%

Federal_Funds_Purchased_Federa

Federal Funds Purchased - Federal Funds Purchased Overnight Deposits from Correspondent Banks (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Banking And Thrift [Abstract]
Average daily balance during the year	$49,899	$37,958	$53,803
Average interest rate during the period	0.10%	0.05%	0.05%
Maximum month-end balance during the year	$151,992	$53,274	$82,473
Weighted average interest rate at year end	0.29%	0.05%	0.05%

Federal_Home_Loan_Bank_Advance1

Federal Home Loan Bank Advances and Other Borrowed Funds - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking And Thrift [Abstract]
Federal Home Loan Bank advances, maximum eligible amount under collateralized transaction	$187,195
Advances from the Federal Home Loan Bank	$0	$0

Corporate_Debenture_Additional

Corporate Debenture - Additional Information (Detail) (USD $)	0 Months Ended		12 Months Ended	0 Months Ended		1 Months Ended	0 Months Ended
In Thousands, unless otherwise specified	Sep. 09, 2004	Sep. 22, 2003	Dec. 31, 2014	Jan. 18, 2005	Sep. 17, 2003	Nov. 30, 2011	Mar. 06, 2007	Nov. 01, 2011
Corporate Debenture [Line Items]
Floating rate corporate debenture issued, amount	$2,500
Corporate debenture lives		30 years
Corporate debenture callable, Call option period		5 years
Debt instrument maturity year			2033
Valrico Bancorp [Member]
Corporate Debenture [Line Items]
Debenture interest rate description			Three month LIBOR plus 270 basis points
Corporate debenture, basis spread on LIBOR rate	2.70%
Corporate debenture lives	30 years
Corporate debenture callable, Call option period	5 years
Gulfstream Bancshares, Inc. [Member]
Corporate Debenture [Line Items]
Floating rate corporate debenture issued, amount				7,000
Trust [Member]
Corporate Debenture [Line Items]
Floating rate corporate debenture issued, amount		10,000
Trust preferred securities, basis spread on LIBOR rate		3.05%
Debenture interest rate description			Three month LIBOR plus 305 basis points
Trust preferred security lives		30 years
Trust preferred securities callable, call option period		5 years
Investment in the common stock of the trust		310
Corporate debenture, basis spread on LIBOR rate		3.05%
Valrico Trust [Member]
Corporate Debenture [Line Items]
Trust preferred securities, basis spread on LIBOR rate	2.70%
Trust preferred security lives	30 years
Trust preferred securities callable, call option period	5 years
Investment in the common stock of the trust	77
Federal Trust Statutory I [Member]
Corporate Debenture [Line Items]
Floating rate corporate debenture issued, amount					5,000
Trust preferred securities, basis spread on LIBOR rate						2.95%
Debenture interest rate description			Three month LIBOR plus 295 basis points
Trust preferred security lives						30 years
Trust preferred securities callable, call option period						5 years
Investment in the common stock of the trust								155
Corporate debenture, basis spread on LIBOR rate						2.95%
Corporate debenture lives						30 years
Corporate debenture callable, Call option period						5 years
Gulfstream Bancshares Capital Trust I [Member]
Corporate Debenture [Line Items]
Trust preferred securities, basis spread on LIBOR rate				1.90%
Debenture interest rate description			Three month LIBOR plus 190 bps
Trust preferred security lives				30 years
Corporate debenture, basis spread on LIBOR rate				1.90%
Corporate debenture lives				30 years
Gulfstream Bancshares Capital Trust II [Member]
Corporate Debenture [Line Items]
Floating rate corporate debenture issued, amount							$3,000
Trust preferred securities, basis spread on LIBOR rate							1.70%
Debenture interest rate description			Three month LIBOR plus 170 bps
Trust preferred security lives							30 years
Gulfstream Bancshares Capital Trust [Member]
Corporate Debenture [Line Items]
Corporate debenture, basis spread on LIBOR rate							1.70%
Corporate debenture lives							30 years

Income_Taxes_Allocation_of_Fed

Income Taxes - Allocation of Federal and State Income Tax Expense (Benefit) Between Current and Deferred Portions (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current, Federal Tax Expense	$4,384	$4,423	($32)
Current, State Tax Expense	1,009	1,055	271
Current, Total	5,393	5,478	239
Deferred, Federal Tax Expense	1,486	27	3,761
Deferred, State Tax Expense	247	5	625
Deferred, Total	1,733	32	4,386
Federal, Total	5,870	4,450	3,729
State, Total	1,256	1,060	896
Total	$7,126	$5,510	$4,625

Income_Taxes_Components_of_Def

Income Taxes - Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Allowance for loan losses	$7,675	$7,890
Stock based compensation	771	469
Deferred compensation	2,425	2,598
Impairment expenses	463	403
Net operating loss carryforward	20,308
Other real estate owned expenses	2,391	3,074
Fair value adjustments	18,386
Nonaccrual interest	2,579	560
Unrealized loss on investment securities available for sale		2,816
Other	75	1,007
Total deferred tax assets	55,073	18,817
Deferred tax liabilities:
Premises and equipment, due to differences in depreciation methods and useful lives	-2,264	-4,096
Deferred loan costs, net	-358	-156
Fair value adjustments		-8,937
Like kind exchange	-300	-300
Unrealized gain on investment securities available for sale	-2,548
Accretion of discounts on investments	-16	-32
Total deferred tax liabilities	-5,486	-13,521
Net deferred tax asset	$49,587	$5,296

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2012	Jun. 01, 2014
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$52,645
Per year tax credit carryforwards			6,487
U.S. federal corporate rate	35.00%	34.00%
First Southern Bank Inc [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			$57,375

Income_Taxes_Summary_of_Net_Op

Income Taxes - Summary of Net Operating Loss Carryforwards (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$52,645
2029 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,105
2030 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	27,889
2031 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	10,463
2032 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,028
2033 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	4,027
2034 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$6,133

Income_Taxes_Reconciliation_Be

Income Taxes - Reconciliation Between the Actual Tax Expense and the Expected Tax (Benefit) Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
“Expected” tax (benefit) expense	$7,032	$6,214	$4,940
Tax exempt interest, net	-910	-907	-925
Bank owned life insurance	-549	-391	-412
State income taxes, net of federal income tax benefits	817	689	591
Stock based compensation	83	100	104
Merger and acquisition related expenses	536	68	259
Other, net	117	-263	68
Total	$7,126	$5,510	$4,625

RelatedParty_Transactions_Summ

Related-Party Transactions - Summary Loans to Principal Officers, Directors and Their Affiliates (Detail) (Principal Officer Directors and Their Affiliates [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Principal Officer Directors and Their Affiliates [Member]
Related Party Transaction [Line Items]
Beginning balance	$3,261	$3,957
New loans	4,135	2,354
Repayments	-1,816	-3,050
Ending balance	$5,580	$3,261

RelatedParty_Transactions_Addi

Related-Party Transactions - Additional Information (Detail) (Principal Officer Directors and Their Affiliates [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Principal Officer Directors and Their Affiliates [Member]
Related Party Transaction [Line Items]
Line of credit available for principal officers, directors, and their affiliates	$2,671	$2,057
Deposits from principal officers, directors, and their affiliates	$29,746	$12,694

Regulatory_Capital_Matters_Add

Regulatory Capital Matters - Additional Information (Detail)	Dec. 31, 2014
Banking And Thrift [Abstract]
Tier 1 leverage ratio	8.00%

Regulatory_Capital_Matters_Sum

Regulatory Capital Matters - Summary of Actual, Required, and Capital Levels Necessary for Capital Adequacy Purposes (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Amount	$384,162	$262,701
Tier 1 capital (to risk weighted assets), Amount	364,264	244,323
Tier 1 capital (to average assets), Amount	364,264	244,323
Total capital (to risk weighted assets), Ratio	15.10%	17.90%
Tier 1 capital (to risk weighted assets), Ratio	14.40%	16.60%
Tier 1 capital (to average assets), Ratio	10.10%	10.40%
Total capital (to risk weighted assets) For capital adequacy purposes, Amount	202,946	117,450
Tier 1 capital (to risk weighted assets) For capital adequacy purposes, Amount	101,473	58,725
Tier 1 capital (to average assets) For capital adequacy purposes, Amount	144,051	94,182
CenterState Bank of Florida, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Amount	360,278	213,744
Tier 1 capital (to risk weighted assets), Amount	340,389	195,434
Tier 1 capital (to average assets), Amount	340,389	195,434
Total capital (to risk weighted assets), Ratio	14.20%	14.60%
Tier 1 capital (to risk weighted assets), Ratio	13.40%	13.40%
Tier 1 capital (to average assets), Ratio	9.40%	8.30%
Total capital (to risk weighted assets) For capital adequacy purposes, Amount	203,268	117,021
Tier 1 capital (to risk weighted assets) For capital adequacy purposes, Amount	101,634	58,511
Tier 1 capital (to average assets) For capital adequacy purposes, Amount	144,185	93,955
Total capital (to risk weighted assets) For capital adequacy purposes, Ratio	8.00%	8.00%
Tier 1 capital (to risk weighted assets) For capital adequacy purposes, Ratio	4.00%	4.00%
Tier 1 capital (to average assets) For capital adequacy purposes, Ratio	4.00%	4.00%
Total capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Amount	254,085	146,277
Tier 1 capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Amount	152,451	87,766
Tier 1 capital (to average assets) To be well capitalized under Prompt corrective action provision, Amount	$180,231	$117,444
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets) For capital adequacy purposes, Ratio	8.00%	8.00%
Tier 1 capital (to risk weighted assets) For capital adequacy purposes, Ratio	4.00%	4.00%
Tier 1 capital (to average assets) For capital adequacy purposes, Ratio	4.00%	4.00%
Minimum [Member] | CenterState Bank of Florida, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Ratio	10.00%	10.00%
Tier 1 capital (to risk weighted assets) To be well capitalized under Prompt corrective action provision, Ratio	6.00%	6.00%
Tier 1 capital (to average assets) To be well capitalized under Prompt corrective action provision, Ratio	5.00%	5.00%

Dividends_Additional_Informati

Dividends - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Nov. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Cash dividends declared & paid on common stock		$1,709	$1,204	$1,203
Dividend received from subsidiary banks	$34,000

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 25, 2013	Dec. 31, 2011	Apr. 24, 2007	Jan. 17, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options outstanding	1,138,404	1,073,716	1,158,646		1,128,304
Average exercise price of shares outstanding	$11.23	$13.83	$13.64		$14.03
Fair value of restricted stock granted	$4.67	$4.91	$3.09
Number of shares expected to vest in future	1,099,700
Employee incentive stock options, granted	0	3,000	57,500
Stock option plans of subsidiary banks , assumed and converted, Outstanding exercisable options	864,249
Options granted, Weighted-Average Exercise Price		$10.22	$6.87
Income tax benefit provided by share based awards	$350
Expense Recognized	75
Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense Recognized	980
2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares available for issuance				1,600,000
2013 Plan expiration				2023
2007 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares available for issuance						1,350,000
1999 plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares available for issuance	730,000
Employee incentive stock options, granted	0
Stock option plans of subsidiary banks , assumed and converted, Outstanding exercisable options	3,170
Options granted, Weighted-Average Exercise Price	$12.62
Employee [Member] | 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares available for issuance				1,525,000
Shares available for future grants	886,911
Employee [Member] | 2007 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee incentive stock options, granted	0
Director [Member] | 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares available for issuance				75,000
Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options outstanding	419,184						774,104
Average exercise price of shares outstanding	$7.16						$6.99
Stock option expiration period	5 years
Remaining unrecognized compensation cost related to non-vested stock options	607
Non vested stock options, unrecognized compensation cost, recognition period	8 years
Stock Option [Member] | Weighted Average [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non vested stock options, unrecognized compensation cost, recognition period	2 years 2 months 12 days
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSAs, granted	492,114	59,500	54,500
Income tax benefit provided by share based awards	517	122	101
Remaining unrecognized compensation cost related to non-vested stock options	5,624
Non vested stock options, unrecognized compensation cost, recognition period	10 years
Number of RSAs, outstanding	659,670	240,341	209,384		179,152
Restricted Stock [Member] | Underlying Shares Issued [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSAs, granted	250,375
Number of RSAs, outstanding	249,542
Restricted Stock [Member] | Underlying Shares Not Issued [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSAs, granted	241,739
Number of RSAs, outstanding	410,128	240,341
Restricted Stock [Member] | Employee [Member] | 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSAs, granted	492,114
Fair value of restricted stock granted	$10.55
Restricted Stock [Member] | Minimum [Member] | 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock awards vesting period	2 years
Restricted Stock [Member] | Maximum [Member] | 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock awards vesting period	10 years
Restricted Stock [Member] | Weighted Average [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non vested stock options, unrecognized compensation cost, recognition period	2 years 9 months 18 days
Performance Share Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Income tax benefit provided by share based awards	517	122	101
Remaining unrecognized compensation cost related to non-vested stock options	905
Non vested stock options, unrecognized compensation cost, recognition period	3 years
Performance Share Units [Member] | 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance share units vesting date	31-Dec-17
Number of shares expected to vest in future				109,247
Performance Share Units [Member] | Minimum [Member] | 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares expected to vest in future				0
Performance Share Units [Member] | Maximum [Member] | 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares expected to vest in future				163,871
Performance Share Units [Member] | Weighted Average [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non vested stock options, unrecognized compensation cost, recognition period	2 years
Qualified Incentive Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Income tax benefit provided by share based awards	0
Non Qualified Incentive Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Income tax benefit provided by share based awards	$350	$0	$0

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Stock Based Compensation Expense Recognized (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock option expense	$238	$292	$363
RSA expense	1,264	317	268
PSU expense	75
Total stock-based compensation expense	$1,577	$609	$631

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Estimated Fair Value of Options Granted Weighted-Average Assumptions (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected option life	6 months	7 years 8 months 12 days	7 years 8 months 12 days
Risk-free interest rate	0.07%	1.91%	1.08%
Expected volatility	0.01%	44.50%	44.30%
Dividend yield	0.00%	0.39%	0.62%

StockBased_Compensation_Inform

Stock-Based Compensation - Information Related to Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Total intrinsic value of stock options exercised	$1,114	$2
Cash received from stock options exercised	1,129
Gross income tax benefit from the exercise of stock options	$350

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, beginning of period, Number of Options	1,073,716	1,158,646	1,128,304
Options granted, Number of Options	0	3,000	57,500
Options issued, Number of Options	774,104
Options exercised, Number of Options	-233,762	-1,714
Options forfeited, Number of Options	-475,654	-86,216	-27,158
Options outstanding, end of period, Number of Options	1,138,404	1,073,716	1,158,646
Options outstanding, beginning of period, Weighted-Average Exercise Price	$13.83	$13.64	$14.03
Options granted, Weighted-Average Exercise Price		$10.22	$6.87
Options issued, Weighted-Average Exercise Price	$6.99
Options exercised, Weighted-Average Exercise Price	$6.09	$8.90
Options forfeited, Weighted-Average Exercise Price	$12.73	$11.22	$15.33
Options outstanding, end of period, Weighted-Average Exercise Price	$11.23	$13.83	$13.64
Options fully vested and expected to vest, Number of Options	1,099,700
Options exercisable, Number of Options	864,249
Options fully vested and expected to vest, Weighted Average Exercise Price	$11.21
Options exercisable, end of period, Weighted-Average Exercise Price	$10.92
Options outstanding, Weighted-Average Contractual Term	4 years 2 months 12 days
Options fully vested and expected to vest, Weighted-Average Contractual Term	4 years 2 months 12 days
Options exercisable, Weighted-Average Contractual Term	4 years 1 month 6 days
Options outstanding, Aggregate Intrinsic Value	$2,558
Options fully vested and expected to vest, Aggregate Intrinsic Value	2,499
Options exercisable, Aggregate Intrinsic Value	$2,180

StockBased_Compensation_Summar3

Stock-Based Compensation - Summary of Restricted Stock Awards Activity (Detail) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSAs outstanding, beginning of period	240,341	209,384	179,152
Number of RSAs, granted	492,114	59,500	54,500
Number of RSAs, vested	-36,586	-28,543	-24,268
Number of RSAs, forfeited	-36,199
Number of RSAs, outstanding, end of period	659,670	240,341	209,384
Weighted-Average fair value Stock price, outstanding, beginning of period	$9.76	$9.62	$10.53
Weighted-Average fair value Stock price, Granted	$10.55	$10.22	$6.87
Weighted-Average fair value Stock price, Vested	$9.77	$9.66	$10.19
Weighted-Average fair value Stock price, Forfeited	$10.79
Weighted-Average fair value Stock price, outstanding, ending of period	$10.30	$9.76	$9.62
Underlying Shares Not Issued [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSAs outstanding, beginning of period	240,341
Number of RSAs, granted	241,739
Number of RSAs, vested	-35,753
Number of RSAs, forfeited	-36,199
Number of RSAs, outstanding, end of period	410,128
Underlying Shares Issued [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSAs, granted	250,375
Number of RSAs, vested	-833
Number of RSAs, outstanding, end of period	249,542

Employee_Benefit_Plan_Addition

Employee Benefit Plan - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2007
	Officers			Officers	Officers
Schedule Of Sale Of Subsidiary [Abstract]
Company's contributions for the plan	$1,398	$1,219	$1,144
Eligibility period to participate in the plan	6 months
Additional number of executive officers entered into salary continuation agreements				5
Number of executive officers entered into salary continuation agreements due to acquisition	4
Company expensed for the accrual of future salary continuation benefits	580	569	501
Salary continuation benefits payable	3,621	3,143	2,597
Asset and the related deferred compensation payable	1,484	1,355	1,158
Administration expenses of the trust	$5
Number of Valrico state bank executive officers pursuant to acquisition entered into rabbi trust agreement					2

Parent_Company_Only_Financial_2

Parent Company Only Financial Statements - Condensed Balance Sheet (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Assets:
Cash and due from banks	$52,067	$21,581
Prepaid expenses and other assets	21,973	11,556
TOTAL ASSETS	3,776,869	2,416,011	2,363,240
Liabilities:
Accounts payable and accrued expenses	29,085	18,706
Corporate debentures	23,917	16,996
Total liabilities	3,324,392	2,142,632
Stockholders’ equity:
Common stock	453	301
Additional paid-in capital	388,698	229,544
Retained earnings	59,273	48,018
Accumulated other comprehensive income	4,053	-4,484
Total stockholders’ equity	452,477	273,379	273,531	262,633
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	3,776,869	2,416,011
Parent Company [Member]
Assets:
Cash and due from banks	2,808	966
Inter-company receivable from bank subsidiary	27,000	45,703
Investment in wholly-owned bank subsidiary	441,710	241,990
Investment in other wholly-owned subsidiary	1,381	2,322
Prepaid expenses and other assets	9,782	3,995
TOTAL ASSETS	482,681	294,976
Liabilities:
Accounts payable and accrued expenses	6,287	4,601
Corporate debentures	23,917	16,996
Total liabilities	30,204	21,597
Stockholders’ equity:
Common stock	453	301
Additional paid-in capital	388,698	229,544
Retained earnings	59,273	48,018
Accumulated other comprehensive income	4,053	-4,484
Total stockholders’ equity	452,477	273,379
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$482,681	$294,976

Parent_Company_Only_Financial_3

Parent Company Only Financial Statements - Condensed Statements of Operations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements Captions [Line Items]
Interest expense	($7,356)	($5,885)	($8,481)
Net income before income tax benefit	20,090	17,753	14,530
Income tax benefit	7,126	5,510	4,625
Net income	12,964	12,243	9,905
Parent Company [Member]
Condensed Financial Statements Captions [Line Items]
Dividend income	1,155	45,725	12,282
Other income			5
Interest expense	-942	-602	-835
Operating expenses	-3,875	-3,538	-3,142
Income before equity in undistributed income of subsidiaries	-3,662	41,585	8,310
Equity in undistributed (losses) income of subsidiaries	14,828	-31,040	147
Net income before income tax benefit	11,166	10,545	8,457
Income tax benefit	-1,798	-1,697	-1,448
Net income	$12,964	$12,243	$9,905

Parent_Company_Only_Financial_4

Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$12,964	$12,243	$9,905
Adjustments to reconcile net income to net cash used in operating activities:
Stock based compensation expense	1,577	609	631
Cash flows from investing activities:
Net cash from bank acquisition	-130,494		-81,061
Cash flows from financing activities:
Stock options exercised, net of tax benefit	1,129
Dividends paid to shareholders	-1,709	-1,204	-1,203
Net increase (decrease) in cash and cash equivalents	-16,476	38,141	-14,347
Cash and cash equivalents, beginning of period	174,889	136,748	151,095
Cash and cash equivalents, end of period	158,413	174,889	136,748
Parent Company [Member]
Cash flows from operating activities:
Net income	12,964	12,243	9,905
Adjustments to reconcile net income to net cash used in operating activities:
Equity in net earnings of subsidiaries	-15,983	-14,686	-12,429
Increase in payables and accrued expenses	-608	371	893
Decrease (increase) in other assets	2,294	1,843	-1,164
Stock based compensation expense	497	107	142
Net cash flows used in operating activities	-836	-122	-2,653
Cash flows from investing activities:
Inter-company receivables from subsidiary banks	18,703	-43,703	17,000
Net cash from bank acquisition	-16,455
Investment in subsidiaries			-28,000
Dividends from bank subsidiaries		34,000	10,000
Dividends from nonbank subsidiary	1,155	11,725	2,282
Net cash flows provided by investing activities	3,403	2,022	1,282
Cash flows from financing activities:
Stock options exercised, net of tax benefit	984
Dividends paid to shareholders	-1,709	-1,204	-1,203
Net cash flows used in financing activities	-725	-1,204	-1,203
Net increase (decrease) in cash and cash equivalents	1,842	696	-2,574
Cash and cash equivalents, beginning of period	966	270	2,844
Cash and cash equivalents, end of period	$2,808	$966	$270

Credit_Commitments_Summary_of_

Credit Commitments - Summary of Credit Commitments (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Credit Commitments, Total	$10,299,000	$6,769,000
Available Lines of Credit [Member]
Loss Contingencies [Line Items]
Credit Commitments, Total	244,016,000	143,199,000
Unfunded Loan Commitments - Fixed [Member]
Loss Contingencies [Line Items]
Credit Commitments, Total	62,450,000	9,004,000
Unfunded Loan Commitments - Variable [Member]
Loss Contingencies [Line Items]
Credit Commitments, Total	$17,416,000	$14,179,000

Basic_and_Diluted_Earnings_Per2

Basic and Diluted Earnings Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Anti dilutive stock options	928,692	1,110,465	1,143,598

Basic_and_Diluted_Earnings_Per3

Basic and Diluted Earnings Per Share - Factors Used in Earnings Per Share Computations (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic
Net income available to common shareholders	$12,964	$12,243	$9,905
Less: Earnings allocated to participating securities	-17
Net income allocated to common shareholders	12,947	12,243	9,905
Weighted average common shares outstanding including participating securities	40,904,988	30,102,777	30,073,959
Less: Participating securities	-52,986
Average shares	40,852,002	30,102,777	30,073,959
Basic earnings per common share	$0.32	$0.41	$0.33
Diluted
Net income available to common shareholders	$12,947	$12,243	$9,905
Weighted Average Number of Shares Outstanding for basic earnings per common share	40,852,002	30,102,777	30,073,959
Add: Dilutive effects of stock based compensation awards	383,550	117,350	67,904
Average shares and dilutive potential common shares	41,235,552	30,220,127	30,141,863
Dilutive earnings per common share	$0.31	$0.41	$0.33

Reportable_Segments_Reconcilia

Reportable Segments - Reconciliation of Reportable Segment Revenues, Expenses and Profit (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Interest income	$138,227	$100,378	$94,950
Interest expense	-7,356	-5,885	-8,481
Net interest income	130,871	94,493	86,469
Provision for loan losses	-826	76	-9,220
Non interest income	26,226	33,946	59,261
Non interest expense	-136,181	-110,762	-121,980
Net income before income tax benefit	20,090	17,753	14,530
Income tax (provision) benefit	-7,126	-5,510	-4,625
Net income	12,964	12,243	9,905
Total assets	3,776,869	2,416,011	2,363,240
Operating Segments [Member] | Commercial and Retail Banking [Member]
Segment Reporting Information [Line Items]
Interest income	134,938	97,504	90,899
Interest expense	-6,365	-5,263	-7,617
Net interest income	128,573	92,241	83,282
Provision for loan losses	-826	76	-9,220
Non interest income	6,073	13,536	23,550
Non interest expense	-112,836	-86,726	-90,671
Net income before income tax benefit	20,984	19,127	6,941
Income tax (provision) benefit	-7,411	-6,140	-1,722
Net income	13,573	12,987	5,219
Total assets	3,487,014	2,279,221	2,204,176
Operating Segments [Member] | Correspondent Banking And Capital Markets Division [Member]
Segment Reporting Information [Line Items]
Interest income	3,289	2,874	4,051
Interest expense	-50	-20	-28
Net interest income	3,239	2,854	4,023
Non interest income	20,153	20,410	35,707
Non interest expense	-19,470	-20,498	-28,168
Net income before income tax benefit	3,922	2,766	11,562
Income tax (provision) benefit	-1,513	-1,067	-4,351
Net income	2,409	1,699	7,211
Total assets	280,079	132,821	153,289
Corporate Overhead and Administration [Member]
Segment Reporting Information [Line Items]
Interest expense	-941	-602	-836
Net interest income	-941	-602	-836
Non interest income			4
Non interest expense	-3,875	-3,538	-3,141
Net income before income tax benefit	-4,816	-4,140	-3,973
Income tax (provision) benefit	1,798	1,697	1,448
Net income	-3,018	-2,443	-2,525
Total assets	482,681	294,976	294,744
Elimination Entries [Member]
Segment Reporting Information [Line Items]
Total assets	($472,905)	($291,007)	($288,969)

Reportable_Segments_Additional

Reportable Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
	Location
	County
	Subsidiary
Segment Reporting Measurement Disclosures [Abstract]
Number of non bank subsidiary	1
Number of counties in which company operates	20
Number of bank locations	58

Business_Combinations_Addition

Business Combinations - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Jan. 17, 2014	Sep. 19, 2014	Sep. 18, 2014	Jun. 01, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	30-May-14
			Branch	Branch
Business Acquisition [Line Items]
Goodwill on the acquisition	76,739,000					$44,924,000	$44,924,000	$38,035,000
Core Deposits [Member]
Business Acquisition [Line Items]
Estimated economic life	10 years
Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Increase in total assets		23.00%
Increase in total deposits		23.00%
Goodwill on the acquisition		31,516,000
Fair value estimates change period		1 year
Multiplied by the cash consideration each FSB share is entitled to receive		$14.65
Per share exchange ratio		3.012
Total purchase consideration		82,040,000
Loans at fair value		359,583,000
Net Outstanding principal balance		18,267,000
Estimated discount to outstanding principal balance		4.80%
Percentage of loans acquired		24.40%
Loan relationship balances	Greater than $500
Gulfstream Bancshares, Inc. [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Deposit intangible asset	4,173,000
Estimated economic life	10 years
Gulfstream Bancshares, Inc. [Member] | Purchased Credit-Impaired [Member]
Business Acquisition [Line Items]
Loans with credit deficiencies		30,068,000
Gulfstream Bancshares, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Outstanding common stock acquired percentage		100.00%
First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Increase in total assets					32.00%
Increase in total deposits					33.00%
Goodwill on the acquisition					299,000
Fair value estimates change period					1 year
Multiplied by the cash consideration each FSB share is entitled to receive					$3
Per share exchange ratio					0.3				0.3
Total purchase consideration				6,000,000	195,404,000
Loans at fair value					599,525,000
Net Outstanding principal balance					30,811,000
Estimated discount to outstanding principal balance					4.90%
Percentage of loans acquired					33.00%
Number of branch offices sold				6
Deposits transferred				170,000,000
Number of branches closed			4
Percentage of premium on purchase consideration				1.50%
First Southern Bancorp, Inc. [Member] | Sales
Business Acquisition [Line Items]
Number of branch offices sold				5
First Southern Bancorp, Inc. [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Deposit intangible asset	7,396,000
Estimated economic life	10 years
First Southern Bancorp, Inc. [Member] | Purchased Credit-Impaired [Member]
Business Acquisition [Line Items]
Loans with credit deficiencies					$121,684,000
First Southern Bancorp, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Outstanding common stock acquired percentage					100.00%

Business_Combinations_Summary_

Business Combinations - Summary of Purchase Price Calculation (Detail) (USD $)	0 Months Ended
In Thousands, except Share data, unless otherwise specified	Jan. 17, 2014	Sep. 18, 2014	Jun. 01, 2014	30-May-14
Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Number of shares of FSB common stock outstanding	1,569,364
FSB preferred shares that convert to FSB common shares upon a change in control	155,629
Total FSB common shares including conversion of preferred shares	1,724,993
Per share exchange ratio	3.012
Number of shares of CenterState common stock	5,195,541
Multiplied by CenterState common stock price per share	$10.23
Fair value of CenterState common stock issued	$53,150
Multiplied by the cash consideration each FSB share is entitled to receive	$14.65
Total cash consideration, not including cash for fractional shares	25,271
Total cash consideration	25,273
Total consideration to be paid to Gulfstream common shareholders	78,423
Fair value of current Gulfstream stock options to be converted to CenterState stock options	3,617
Total purchase price	82,040
First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Number of shares of FSB common stock outstanding				31,539,698
FSB preferred shares that convert to FSB common shares upon a change in control				48,375
Total FSB common shares including conversion of preferred shares				31,588,073
Per share exchange ratio			0.3	0.3
Number of shares of CenterState common stock				9,476,045
Multiplied by CenterState common stock price per share			$10.62
Fair value of CenterState common stock issued			100,636
Multiplied by the cash consideration each FSB share is entitled to receive			$3
Total cash consideration, not including cash for fractional shares			94,765
Total cash consideration			94,768
Total purchase price		$6,000	$195,404

Business_Combinations_Summary_1

Business Combinations - Summary of Purchase Price Calculation (Parenthetical) (Detail) (USD $)	Jan. 17, 2014	30-May-14
In Thousands, except Share data, unless otherwise specified
Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fractional shares	138
Fractional shares amount	$2
First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Fractional shares		377
Fractional shares amount		$3

Business_Combinations_Summary_2

Business Combinations - Summary of Preliminary Estimates of Fair Value of Assets Purchased, Including Goodwill and Liabilities Assumed (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 17, 2014	Jun. 01, 2014
In Thousands, unless otherwise specified
Assets:
Other repossessed real estate owned covered by FDIC loss share agreements	$19,404	$19,111
Goodwill	76,739	44,924	44,924	38,035
Gulfstream Bancshares, Inc. [Member]
Assets:
Cash and cash equivalents					102,278
Loans, excluding purchased credit impaired loans					329,515
Purchased credit impaired loans					30,068
Loans held for sale					247
Investments					60,816
Interest receivable					1,087
Branch real estate					5,519
Furniture and fixtures					262
Federal Reserve Bank and Federal Home Loan Bank stock					885
Bank owned life insurance					4,939
Other repossessed real estate owned					2,694
Core deposit intangible					4,173
Goodwill					31,516
Other assets					11,261
Total assets acquired					585,260
Liabilities:
Deposits					478,999
Federal Home Loan Bank advances					5,708
Repurchase agreements					7,576
Interest payable					125
Official checks outstanding					826
Corporate debentures					6,745
Other liabilities					3,241
Total liabilities assumed					503,220
First Southern Bancorp, Inc. [Member]
Assets:
Cash and cash equivalents						148,257
Loans, excluding purchased credit impaired loans						477,841
Purchased credit impaired loans						121,684
Investments						204,723
Interest receivable						2,007
Branch real estate						1,594
Furniture and fixtures						1,282
Bank property held for sale						7,119
Federal Reserve Bank and Federal Home Loan Bank stock						5,576
Bank owned life insurance						2,555
Other repossessed real estate owned covered by FDIC loss share agreements						22,731
Other repossessed real estate owned						454
Core deposit intangible						7,396
Goodwill						299
Deferred tax asset						44,131
Other assets						4,581
Total assets acquired						1,052,230
Liabilities:
Deposits						662,959
Deposits held for sale						189,674
Federal Home Loan Bank advances						189,674
Repurchase agreements						58
Interest payable						58
Other liabilities						4,135
Total liabilities assumed						$856,826

Business_Combinations_Summary_3

Business Combinations - Summary of Contractually Required Principal and Interest Cash Payments for Purchased Credit Impaired Loans (Detail) (Purchased Credit-Impaired [Member], USD $)	Jan. 17, 2014	Jun. 01, 2014
In Thousands, unless otherwise specified
Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Contractually required principal and interest	$48,289
Non-accretable difference	-11,766
Cash flows expected to be collected	36,523
Accretable yield	-6,455
Total purchased credit-impaired loans acquired	30,068
First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Contractually required principal and interest		180,960
Non-accretable difference		-33,527
Cash flows expected to be collected		147,433
Accretable yield		-25,749
Total purchased credit-impaired loans acquired		$121,684

Business_Combinations_Summary_4

Business Combinations - Summary of Fair Value of Acquired Loans and Unpaid Principal Balance (Detail) (USD $)	Jan. 17, 2014	Jun. 01, 2014
In Thousands, unless otherwise specified
Book Balance [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	$377,850
Book Balance [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		630,336
Book Balance [Member] | Single Family Residential Real Estate [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	33,506
Book Balance [Member] | Single Family Residential Real Estate [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		60,332
Book Balance [Member] | Commercial Real Estate [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	185,250
Book Balance [Member] | Commercial Real Estate [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		387,589
Book Balance [Member] | Land, Development, Construction [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	30,387
Book Balance [Member] | Land, Development, Construction [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		17,238
Book Balance [Member] | Commercial Loans and Industrial [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	85,940
Book Balance [Member] | Commercial Loans and Industrial [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		20,267
Book Balance [Member] | Consumer and Other Loans [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	2,112
Book Balance [Member] | Consumer and Other Loans [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		2,496
Book Balance [Member] | Purchased Credit-Impaired [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	40,655
Book Balance [Member] | Purchased Credit-Impaired [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		142,414
Fair Value [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	359,583
Fair Value [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		599,525
Fair Value [Member] | Single Family Residential Real Estate [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	32,319
Fair Value [Member] | Single Family Residential Real Estate [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		57,693
Fair Value [Member] | Commercial Real Estate [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	183,189
Fair Value [Member] | Commercial Real Estate [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		382,162
Fair Value [Member] | Land, Development, Construction [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	27,704
Fair Value [Member] | Land, Development, Construction [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		15,942
Fair Value [Member] | Commercial Loans and Industrial [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	84,203
Fair Value [Member] | Commercial Loans and Industrial [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		19,906
Fair Value [Member] | Consumer and Other Loans [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	2,100
Fair Value [Member] | Consumer and Other Loans [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		2,138
Fair Value [Member] | Purchased Credit-Impaired [Member] | Gulfstream Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans	30,068
Fair Value [Member] | Purchased Credit-Impaired [Member] | First Southern Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Carrying value and Fair value of acquired loans		$121,684

Business_Combinations_Schedule

Business Combinations - Schedule of Measurement Period Adjustments (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 17, 2014	Jun. 01, 2014
In Thousands, unless otherwise specified
Assets:
Other repossessed real estate owned covered by FDIC loss share agreements	$19,404	$19,111
Goodwill	76,739	44,924	44,924	38,035
Gulfstream Bancshares, Inc. [Member]
Assets:
Cash and cash equivalents					102,278
Loans, excluding purchased credit impaired loans					329,515
Purchased credit impaired loans					30,068
Loans held for sale					247
Investments					60,816
Interest receivable					1,087
Branch real estate					5,519
Furniture and fixtures					262
Federal Reserve Bank and Federal Home Loan Bank stock					885
Bank owned life insurance					4,939
Other repossessed real estate owned					2,694
Core deposit intangible					4,173
Goodwill					31,516
Other assets					11,261
Total assets acquired					585,260
Liabilities:
Deposits					478,999
Federal Home Loan Bank advances					5,708
Repurchase agreements					7,576
Interest payable					125
Official checks outstanding					826
Corporate debenture					6,745
Other liabilities					3,241
Total liabilities assumed					503,220
Gulfstream Bancshares, Inc. [Member] | As Initially Reported [Member]
Assets:
Cash and cash equivalents					102,278
Loans, excluding purchased credit impaired loans					329,515
Purchased credit impaired loans					30,068
Loans held for sale					247
Investments					60,816
Interest receivable					1,087
Branch real estate					5,519
Furniture and fixtures					262
Federal Reserve Bank and Federal Home Loan Bank stock					885
Bank owned life insurance					4,939
Other repossessed real estate owned					3,365
Core deposit intangible					4,173
Goodwill					31,104
Other assets					11,002
Total assets acquired					585,260
Liabilities:
Deposits					478,999
Federal Home Loan Bank advances					5,708
Repurchase agreements					7,576
Interest payable					125
Official checks outstanding					826
Corporate debenture					6,745
Other liabilities					3,241
Total liabilities assumed					503,220
Gulfstream Bancshares, Inc. [Member] | Measurement Period Adjustments [Member]
Assets:
Other repossessed real estate owned					-671
Goodwill					412
Other assets					259
First Southern Bancorp, Inc. [Member]
Assets:
Cash and cash equivalents						148,257
Loans, excluding purchased credit impaired loans						477,841
Purchased credit impaired loans						121,684
Investments						204,723
Interest receivable						2,007
Branch real estate						1,594
Furniture and fixtures						1,282
Bank property held for sale						7,119
Federal Reserve Bank and Federal Home Loan Bank stock						5,576
Bank owned life insurance						2,555
Other repossessed real estate owned covered by FDIC loss share agreements						22,731
Other repossessed real estate owned						454
Core deposit intangible						7,396
Goodwill						299
Deferred tax asset						44,131
Other assets						4,581
Total assets acquired						1,052,230
Liabilities:
Deposits						662,959
Deposits held for sale						189,674
Federal Home Loan Bank advances						189,674
Repurchase agreements						58
Interest payable						58
Other liabilities						4,135
Total liabilities assumed						856,826
First Southern Bancorp, Inc. [Member] | As Initially Reported [Member]
Assets:
Cash and cash equivalents						148,257
Loans, excluding purchased credit impaired loans						477,841
Purchased credit impaired loans						121,684
Investments						204,723
Interest receivable						2,007
Branch real estate						1,594
Furniture and fixtures						1,282
Bank property held for sale						7,119
Federal Reserve Bank and Federal Home Loan Bank stock						5,576
Bank owned life insurance						2,555
Other repossessed real estate owned covered by FDIC loss share agreements						22,731
Other repossessed real estate owned						454
Core deposit intangible						7,396
Goodwill						541
Deferred tax asset						43,889
Other assets						4,581
Total assets acquired						1,052,230
Liabilities:
Deposits						662,959
Federal Home Loan Bank advances						189,674
Repurchase agreements						58
Other liabilities						4,135
Total liabilities assumed						856,826
First Southern Bancorp, Inc. [Member] | Measurement Period Adjustments [Member]
Assets:
Goodwill						-242
Deferred tax asset						$242

Business_Combinations_ProForma

Business Combinations - Pro-Forma Financial Information And Actual Results of Acquisition (Detail) (First Southern Bank Inc And Gulfstream Bancshares Inc [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
First Southern Bank Inc And Gulfstream Bancshares Inc [Member]
Business Acquisition [Line Items]
Net interest income	$143,527	$153,719
Net income available to common shareholders	$20,066	$21,390
EPS - basic	$0.45	$0.48
EPS - diluted	$0.44	$0.47

Derivatives_Additional_Informa

Derivatives - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative Instruments Notional And Fair Value [Line Items]
Investment securities with a fair value	$10,445	$6,140
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Notional And Fair Value [Line Items]
Notional amount	$240,779	$91,058

Derivatives_Summary_Informatio

Derivatives - Summary Information about the Derivative Instruments (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Fair value of interest rate swap derivatives (asset)	$6,800	$2,603
Fair value of interest rate swap derivatives (liability)	7,575	2,496
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	240,779	91,058
Weighted average pay rate on interest-rate swaps	3.96%	4.34%
Weighted average receive rate on interest rate swaps	1.50%	1.71%
Weighted average maturity (years)	11 years	10 years
Fair value of interest rate swap derivatives (asset)	6,800	2,603
Fair value of interest rate swap derivatives (liability)	$7,575	$2,496