Enterprise Financial Services (EFSC) 10-K 26 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 22, 2016	Jun. 30, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	ENTERPRISE FINANCIAL SERVICES CORP
Entity Central Index Key	1,025,835
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		20,173,107
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 432,920,454

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 47,935	$ 42,903
Federal funds sold	91	35
Interest-earning deposits (including $1,320 and $980 pledged as collateral, respectively)	46,131	57,758
Total cash and cash equivalents	94,157	100,696
Interest-earning deposits greater than 90 days	1,000	5,300
Securities available for sale	451,770	400,146
Securities held to maturity	43,714	45,985
Loans held for sale	6,598	4,033
Portfolio loans	2,750,737	2,433,916
Less: Allowance for loan losses	33,441	30,185
Portfolio loans, net	2,717,296	2,403,731
Purchased credit impaired loans, net of the allowance for loan losses ($10,175 and $15,410, respectively)	64,583	83,693
Total loans, net	2,781,879	2,487,424
Other real estate	8,366	1,896
Other real estate covered under FDIC loss share	0	5,944
Other investments, at cost	17,455	17,037
Fixed assets, net	14,842	14,753
Accrued interest receivable	8,399	7,956
State tax credits, held for sale, including $5,941 and $11,689 carried at fair value, respectively	45,850	38,309
FDIC loss share receivable	0	15,866
Goodwill	30,334	30,334
Intangible assets, net	3,075	4,164
Other assets	101,044	97,160
Total assets	3,608,483	3,277,003
Liabilities and Shareholders' equity
Demand deposits	717,460	642,930
Interest-bearing transaction accounts	564,420	508,941
Money market accounts	1,053,662	755,569
Savings	92,861	78,718
Certificates of deposit:
$100 and over	256,760	377,544
Other	99,428	127,808
Total deposits	2,784,591	2,491,510
Subordinated debentures	56,807	56,807
Federal Home Loan Bank advances	110,000	144,000
Other borrowings	270,326	234,183
Notes payable	0	5,700
Accrued interest payable	629	843
Other liabilities	35,301	27,719
Total liabilities	3,257,654	2,960,762
Shareholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized; 0 shares issued and outstanding	0	0
Common stock, $0.01 par value; 30,000,000 shares authorized; 20,093,119 and 19,913,519 shares issued, respectively	201	199
Treasury stock, at cost; 76,000 shares	(1,743)	(1,743)
Additional paid in capital	210,589	207,731
Retained earnings	141,564	108,373
Accumulated other comprehensive income	218	1,681
Total shareholders' equity	350,829	316,241
Total liabilities and shareholders' equity	$ 3,608,483	$ 3,277,003

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Collateral pledged	$ 1,320	$ 980
Allowance for loan losses on Portfolio loans, covered under FDIC loss share	10,175	15,410
State Tax Credits Held For Sale, Fair Value Disclosure	$ 5,941	$ 11,689
Shareholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	20,093,119	19,913,519
Treasury stock, shares	76,000	76,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income:
Interest and fees on loans	$ 122,370	$ 121,395	$ 143,181
Interest on debt securities:
Taxable	8,842	8,711	8,325
Nontaxable	1,215	1,188	1,209
Interest on interest-bearing deposits	211	187	210
Dividends on equity securities	141	273	364
Total interest income	132,779	131,754	153,289
Interest expense:
Interest-bearing transaction accounts	1,149	653	461
Money market accounts	2,993	2,716	3,080
Savings accounts	219	201	225
Certificates of deposit:
$100 and over	4,664	5,281	5,554
Other	1,387	1,636	1,822
Subordinated debentures	1,248	1,322	3,019
Federal Home Loan Bank advances	127	1,799	2,938
Notes payable and other borrowings	582	778	1,038
Total interest expense	12,369	14,386	18,137
Net interest income	120,410	117,368	135,152
Provision (provision reversal) for portfolio loan losses	4,872	4,409	(642)
Provision (provision reversal) for purchased credit impaired loan losses	(4,414)	1,083	4,974
Net interest income after provision for loan losses	119,952	111,876	130,820
Noninterest income:
Wealth management revenue	7,007	6,942	7,118
Service charges on deposit accounts	7,923	7,181	6,825
Other service charges and fee income	3,241	2,953	2,717
Gain on sale of branches	0	0	1,044
Gain on sale of other real estate	142	1,531	3,363
Gain on state tax credits, net	2,720	2,252	2,503
Gain on sale of investment securities	23	0	1,295
Change in FDIC loss share receivable	(5,030)	(9,307)	(18,173)
Miscellaneous income	4,649	5,079	3,207
Total noninterest income	20,675	16,631	9,899
Noninterest expense:
Employee compensation and benefits	46,095	47,232	47,278
Occupancy	6,573	6,527	7,277
Expense recorded related to Clawback Liability	760	1,201	951
FDIC Loss Share Termination	2,436	0	0
Data processing	4,339	4,481	4,137
FDIC and other insurance	2,790	2,884	3,244
Loan legal and other real estate expense	1,812	3,936	4,496
Professional fees	3,465	3,825	4,876
FHLB prepayment penalty	0	2,936	2,590
Other	13,956	14,441	15,790
Total noninterest expense	82,226	87,463	90,639
Income before income tax expense	58,401	41,044	50,080
Income tax expense	19,951	13,871	16,976
Net income	$ 38,450	$ 27,173	$ 33,104
Earnings per common share
Basic (usd per share)	$ 1.92	$ 1.38	$ 1.78
Diluted (usd per share)	$ 1.89	$ 1.35	$ 1.73

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 38,450	$ 27,173	$ 33,104
Other comprehensive (loss) income, net of tax:
Unrealized (losses) gains on investment securities arising during the period, net of income tax (benefit) expense of ($899), $3,762, and $(7,059), respectively	(1,449)	6,061	(11,371)
Less: Reclassification adjustment for realized gains on sale of securities available for sale included in net income, net of income tax expense of $9, $0, and $496, respectively	(14)	0	(799)
Total other comprehensive (loss) income	(1,463)	6,061	(12,170)
Total comprehensive income	$ 36,987	$ 33,234	$ 20,934

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other comprehensive income, tax:
Unrealized (loss)/gain on investment securities available for sale arising during the period, tax	$ (899)	$ 3,762	$ (7,059)
Reclassification adjustment for realized gains on sale of securities available for sale included in net income, tax	$ 9	$ 0	$ 496

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Treasury Stock	Additional paid in capital	Retained earnings	Accumulated other comprehensive income (loss)
Balance at Dec. 31, 2012	$ 235,745	$ 0	$ 181	$ (1,743)	$ 173,299	$ 56,218	$ 7,790
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,104	0	0	0	0	33,104	0
Other comprehensive income	(12,170)	0	0	0	0	0	(12,170)
Cash dividends paid on common shares, $0.21 per share	3,946	0	0	0	0	(3,946)	0
Repurchase of preferred stock	1,006	0	0	0	(1,006)	0	0
Issuance under equity compensation plans, net	2,265	0	1	0	2,264	0	0
Trust preferred securities conversion	20,443	0	12	0	20,431	0	0
Share-based compensation	5,048	0	0	0	5,048	0	0
Excess tax benefit related to equity compensation plans	222	0	0	0	222	0	0
Balance at Dec. 31, 2013	279,705	0	194	(1,743)	200,258	85,376	(4,380)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,173	0	0	0	0	27,173	0
Other comprehensive income	6,061	0	0	0	0	0	6,061
Cash dividends paid on common shares, $0.21 per share	4,176	0	0	0	0	4,176	0
Issuance under equity compensation plans, net	(679)	0	2	0	(681)	0	0
Trust preferred securities conversion	5,002	0	3	0	4,999	0	0
Share-based compensation	2,950	0	0	0	2,950	0	0
Excess tax benefit related to equity compensation plans	205	0	0	0	205	0	0
Balance at Dec. 31, 2014	316,241	0	199	(1,743)	207,731	108,373	1,681
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	38,450	0	0	0	0	38,450	0
Other comprehensive income	(1,463)
Reclassification adjustment for realized gain on sale of securities included in net income, net of tax	(1,463)	0	0	0	0	0	1,463
Cash dividends paid on common shares, $0.21 per share	5,259	0	0	0	0	(5,259)	0
Issuance under equity compensation plans, net	(1,190)	0	2	0	(1,192)	0	0
Share-based compensation	3,601	0	0	0	3,601	0	0
Excess tax benefit related to equity compensation plans	449	0	0	0	449	0	0
Balance at Dec. 31, 2015	$ 350,829	$ 0	$ 201	$ (1,743)	$ 210,589	$ 141,564	$ 218

Consolidated Statements of Sha8

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash dividends paid on common shares, per share	$ 0.2625	$ 0.21	$ 0.21
Issuance under equity compensation plans, shares	179,600	225,958	135,087
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	287,852	1,176,470

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 38,450	$ 27,173	$ 33,104
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	2,022	2,238	2,783
Provision for loan losses	458	5,492	4,332
Deferred income taxes	5,763	(4,277)	9,943
Net amortization of debt securities	3,256	3,810	5,593
Amortization of intangible assets	1,089	1,254	1,905
Gain on sale of investment securities	(23)	0	(1,295)
Mortgage loans originated for sale	(135,721)	(74,135)	(78,335)
Proceeds from mortgage loans sold	133,552	72,529	88,845
Gain on sale of other real estate	(142)	(1,531)	(3,363)
Gain on state tax credits, net	(2,720)	(2,252)	(2,503)
Excess tax benefit of share-based compensation	(449)	(205)	(222)
Share-based compensation	3,601	2,950	5,048
Valuation adjustment on other real estate	82	696	1,443
Net accretion of loan discount and indemnification asset	(7,805)	(9,879)	(16,435)
Gain on sale of branches	0	0	(1,044)
Changes in:
Accrued interest receivable	(443)	(653)	1,179
Accrued interest payable	(214)	(114)	(303)
Prepaid FDIC insurance	0	0	2,607
Other assets	10,375	(205)	(12,002)
Other liabilities	7,582	49	7,914
Net cash provided by operating activities	47,187	31,494	29,308
Cash flows from investing activities:
Net cash paid for acquisitions and dispositions	0	0	(67,564)
Net decrease (increase) in loans	(290,326)	(240,640)	36,169
Net cash proceeds received from FDIC loss share receivable	2,275	9,605	10,981
Proceeds from the termination of FDIC loss share agreements	1,253	0	0
Proceeds from the sale of debt securities, available for sale	41,069	0	159,604
Proceeds from the paydown or maturity of debt securities, available for sale	53,733	47,678	82,641
Proceeds from the paydown or maturity of debt securities, held to maturity	2,284	455	0
Proceeds from the redemption of other investments	39,929	29,045	30,632
Proceeds from the sale of state tax credits held for sale	16,337	12,814	16,723
Proceeds from the sale of other real estate	7,378	17,259	19,558
Payments for the purchase of:
Available for sale debt and equity securities	(152,044)	(53,664)	(60,732)
Other investments	(36,046)	(33,477)	(29,225)
Bank owned life insurance	0	0	(20,000)
State tax credits held for sale	(20,981)	0	(1,365)
Fixed assets	(2,111)	(1,901)	(1,338)
Net cash provided by (used in) investing activities	(337,250)	(212,826)	176,084
Cash flows from financing activities:
Net increase (decrease) in noninterest-bearing deposit accounts	74,530	(10,756)	(19,719)
Net increase (decrease) in interest-bearing deposit accounts	218,551	(32,686)	(32,876)
Proceeds from Federal Home Loan Bank advances	945,900	1,227,500	765,000
Repayments of Federal Home Loan Bank advances	(979,900)	(1,133,500)	(795,000)
Repayments of notes payable	(5,700)	(4,800)	(1,200)
Repayments of subordinated debentures	0	0	(2,500)
Net increase (decrease) increase in other borrowings	36,143	30,352	(22,433)
Cash dividends paid on common stock	(5,259)	(4,177)	(3,946)
Excess tax benefit of share-based compensation	449	205	222
Payments for the repurchase of common stock warrants	0	0	(1,006)
Issuance of common stock	2	2	1
Proceeds from the issuance of equity instruments, net	(1,192)	(681)	2,264
Net cash provided (used) by financing activities	283,524	71,459	(111,193)
Net increase (decrease) in cash and cash equivalents	(6,539)	(109,873)	94,199
Cash and cash equivalents, beginning of period	100,696	210,569	116,370
Cash and cash equivalents, end of period	94,157	100,696	210,569
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	12,583	14,500	18,462
Cash paid during the period for income taxes	15,763	8,993	27,133
Noncash transactions:
Transfer to other real estate owned in settlement of loans	8,248	9,869	22,623
Sales of other real estate financed	0	8,083	9,244
Issuance of common stock from Trust Preferred Securities conversion	0	5,002	20,443
Transfer of securities from available for sale to held to maturity	$ 0	$ 46,574	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The significant accounting policies used by the Company in the preparation of the consolidated financial statements are summarized below. Business and Consolidation Enterprise Financial Services Corp and subsidiaries (the “Company” or “Enterprise”) is a financial holding company that provides a full range of banking and wealth management services to individuals and corporate customers primarily located in the St. Louis, Kansas City, and Phoenix metropolitan markets through its banking subsidiary, Enterprise Bank & Trust (the “Bank”). The consolidated financial statements include the accounts of the Company, and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated. The Company is subject to competition from other financial and nonfinancial institutions providing financial services in the markets served by the Company's subsidiary. Additionally, the Company and its banking subsidiary are subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory agencies. The Company has one reportable segment. Use of Estimates The consolidated financial statements of the Company have been prepared in conformity in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”.) In preparing the consolidated financial statements, management is required to make estimates and assumptions, which significantly affect the reported amounts in the consolidated financial statements. Such estimates include the valuation of loans, goodwill, intangible assets, indemnification assets, and other long-lived assets, along with assumptions used in the calculation of income taxes, among others. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. Decreased real estate values, volatile credit markets, and unemployment have combined to increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods. Cash Flow Information For purposes of reporting cash flows, the Company considers cash and due from banks, interest-bearing deposits and federal funds sold that mature within 90 days to be cash and cash equivalents. At December 31, 2015 and 2014 , approximately $13.8 million , and $16.1 million , respectively, of cash and due from banks represented required reserves on deposits maintained by the Company in accordance with Federal Reserve Bank requirements. Investments The Company has classified all investments in debt securities as available for sale or held to maturity. Securities classified as available for sale are carried at fair value. Unrealized holding gains and losses for available for sale securities are excluded from earnings and reported as a net amount in a separate component of shareholders' equity until realized. All previous fair value adjustments included in the separate component of shareholders' equity are reversed upon sale. Securities classified as held to maturity are carried at historical cost and adjusted for amortization of premiums and accretion of discounts. Declines in the fair value of securities below their cost deemed to be other-than-temporary are reflected in operations as realized losses. In estimating other-than-temporary impairment losses, management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it's more likely than not the Company would be required to sell the security before its anticipated recovery in market value. Premiums and discounts are amortized or accreted over the expected lives of the respective securities as an adjustment to yield using the interest method. Dividend and interest income is recognized when earned. Realized gains and losses are included in earnings and are derived using the specific identification method for determining the cost of securities sold. Loans Held for Sale The Company provides long-term financing of one-to-four-family residential real estate by originating fixed and variable rate loans. Long-term fixed and variable rate loans are sold into the secondary market with limited recourse. Upon receipt of an application for a real estate loan, the Company determines whether the loan will be sold into the secondary market or retained in the Company's loan portfolio. The interest rates on the loans sold are locked with the buyer and the Company bears no interest rate risk related to these loans. Mortgage loans held for sale are carried at the lower of cost or fair value, which is determined on a specific identification method. The Company does not retain servicing on any loans sold, nor did the Company have any capitalized mortgage servicing rights at December 31, 2015 or 2014 . Gains on the sale of loans held for sale are reported net of direct origination fees and costs in the Company's consolidated statements of operations. Portfolio Loans Loans are reported at the principal balance outstanding, net of unearned fees, costs, and premiums or discounts on acquired loans. Loan origination fees, direct origination costs, and premiums or discounts resulting from acquired loans are deferred and recognized over the lives of the related loans as a yield adjustment using the interest method. Interest income on loans is accrued to income based on the principal amount outstanding. The recognition of interest income is discontinued when a loan becomes 90 days past due or a significant deterioration in the borrower's credit has occurred which, in management's judgment, negatively impacts the collectibility of the loan. Unpaid interest on such loans is reversed at the time the loan becomes uncollectible and subsequent interest payments received are applied to principal if any doubt exists as to the collectibility of such principal; otherwise, such receipts are recorded as interest income. Loans that have not been restructured are returned to accrual status when management believes full collectibility of principal and interest is expected. Non-accrual loans that have been restructured will remain in a non-accrual status until the borrower has made at least six months of consecutive contractual payments. Purchased Credit Impaired ("PCI") Loans Loans acquired through the completion of a transfer, including loans acquired in a business combination, that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loans, or the “accretable yield,” is recognized as interest income on a level-yield method over the life of the loans. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized as a yield adjustment or as a loss accrual or a valuation allowance. The Company aggregates individual loans with common risk characteristics into pools of loans. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loans over their remaining lives. Decreases in expected cash flows due to an inability to collect contractual cash flows are recognized as impairment through the provision for loan losses account. Any allowance for loan loss on these pools reflect only losses incurred after the acquisition (meaning the present value of all cash flows expected at acquisition that ultimately are not to be received). Any disposals of loans, including sales of loans, payments in full or foreclosures result in the removal of the loan from the loan pool at the carrying amount with differences in actual results reflected in interest income. Impaired Loans Loans are considered “impaired” when it becomes probable that the Company will be unable to collect all amounts due according to the loan's contractual terms. Non-accrual loans, loans past due greater than 90 days and still accruing, unless adequately secured and in the process of collection, and restructured loans qualify as “impaired loans.” Restructured loans involve the granting of a concession to a borrower experiencing financial difficulty involving the modification of terms of the loan, such as changes in payment schedule or interest rate. When measuring impairment, the expected future cash flows of an impaired loan are discounted at the loan's effective interest rate at origination. Alternatively, impairment can be measured by reference to an observable market price, if one exists, or the fair value of the collateral for a collateral-dependent loan. Interest income on impaired loans is not accrued but is recorded when cash is received and only if principal is considered to be fully collectible. Loans and leases, which are deemed uncollectible, are charged off to the allowance for loan losses, while recoveries of amounts previously charged off are credited to the allowance for loan losses. Impaired loans exclude PCI loans, which are accounted for on a pool basis and are generally considered accruing and performing loans, as the loans accrete interest income over the estimated life of the loan when cash flows are reasonably estimable. Accordingly, PCI loans that are contractually past due may still be considered to be accruing and performing loans. If the timing and amount of future cash flows is not reasonably estimable, the loans may be classified as nonaccrual loans and the purchase price discount on those loans is not recorded as interest income until the timing and amount of future cash flows can be reasonably estimated. See Note 6 – Purchased Credit Impaired Loans for more information on these loans. Loans are generally placed on non-accrual status when contractually past due 90 days or more as to interest or principal payments. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management's practice to place such loans on non-accrual status immediately, rather than delaying such action until the loans become 90 days past due. Previously accrued and uncollected interest on such loans is reversed. Income is recorded only to the extent that a determination has been made that the principal balance of the loan is collectable and the interest payments are subsequently received in cash, or for a restructured loan, the borrower has made six consecutive contractual payments. If collectability of the principal is in doubt, payments received are applied to loan principal. Loans past due 90 days or more but still accruing interest are also generally included in nonperforming loans. Loans past due 90 days or more but still accruing are classified as such where the underlying loans are both well secured (the collateral value is sufficient to cover principal and accrued interest) and are in the process of collection. At December 31, 2015 , we did not have any loans past due greater than 90 days and not included in nonperforming loans. Loan Charge-Offs Loans are charged-off when the primary and secondary sources of repayment (cash flow, collateral, guarantors, etc.) are less than their carrying value. Allowance For Loan Losses The allowance for loan losses is increased by provision charged to expense and is available to absorb charge-offs, net of recoveries. Management utilizes a systematic, documented approach in determining the appropriate level of the allowance for loan losses. The level of the allowance reflects management's continuing evaluation of industry concentrations; specific credit risks; loan loss experience; current loan portfolio quality; present economic, political and regulatory conditions; and probable losses inherent in the current loan portfolio. The determination of the appropriate level of the allowance for loan losses inherently involves a degree of subjectivity and requires that the Company make significant estimates of current credit risks and future trends, all of which may undergo material changes. Changes in economic conditions affecting borrowers, new information regarding existing loans, identification of additional problem loans and other factors, both within and outside of our control, may require an increase in the allowance for loan losses. Management believes the allowance for loan losses is adequate to absorb inherent losses in the loan portfolio. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions and other factors. In addition, various regulatory agencies, as an integral part of the examination process, periodically review the Bank's loan portfolio. Such agencies may require additions to the allowance for loan losses based on their judgments and interpretations of information available to them at the time of their examinations. Allowance for Loan Losses on PCI Loans The Company updates its cash flow projections for PCI loans on a periodic basis. Assumptions utilized in this process include projections related to probability of default, loss severity, prepayment, extensions and recovery lag. Projections related to probability of default and prepayment are calculated utilizing a loan migration analysis. The loan migration analysis is a matrix of probability that specifies the probability of a loan pool transitioning into a particular delinquency or liquidation state given its current state at the re-measurement date. Loss severity factors are based upon industry data and experience. Any decreases in expected cash flows after the acquisition date and subsequent measurement periods are recognized by recording an impairment in the provision for loan losses. See Purchased Credit Impaired Loans above for further discussion. Any increase in expected future cash flows due to a decrease in expected credit losses will reverse previously recorded impairment, if any, and add to the accretable yield on the loan pool, prospectively. Other Real Estate Other real estate represents property acquired through foreclosure or deeded to the Company in lieu of foreclosure on loans on which the borrowers have defaulted on the payment of principal or interest. Other real estate is recorded on an individual asset basis at the lower of cost or fair value less estimated costs to sell. The fair value of other real estate is based upon estimates of future cash flows, market value of similar assets, if available, or independent appraisals. These estimates involve significant uncertainties and judgments. As a result, fair value estimates may not be realizable in a current sale or settlement of the other real estate. Subsequent reductions in fair value are expensed within noninterest expense. Gains and losses resulting from the sale of other real estate are credited or charged to current period earnings. Costs of maintaining and operating other real estate are expensed as incurred, and expenditures to complete or improve other real estate properties are capitalized if the expenditures are expected to be recovered upon ultimate sale of the property. FDIC Loss Share Receivable and Clawback Liability As part of FDIC-assisted transactions, the Bank entered into loss sharing agreements with the FDIC from 2009-2011. In 2015, the Bank entered into an agreement with the FDIC to terminate all existing loss sharing agreements. This termination resulted in the removal of the remaining clawback liability of $3.5 million and FDIC receivable of $7.2 million . The following policy discussion refers to transactions prior to December 7, 2015. The FDIC reimbursed the Bank for a percentage of realized losses on loans and foreclosed real estate covered under the agreement (“Covered assets”). In addition, the Bank was reimbursed for certain expenses related to the Covered assets. At the acquisition date, the fair value of the amount due from the FDIC (“FDIC Loss Share Receivable") was estimated based on expected losses and cash flows on the Covered assets. The FDIC Loss Share Receivable was measured separately from the related Covered assets and recorded separately on the balance sheet, because it is not contractually embedded in the Covered assets and was not transferable. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. Subsequent to initial recognition but prior to early termination in the fourth quarter of 2015, the FDIC Loss Share Receivable was reviewed quarterly and adjusted for any changes in expected cash flows. These adjustments were measured on the same basis as the related Covered assets. Any decrease in expected cash flows due to an increase in expected credit losses increased the FDIC Loss Share Receivable which will partially offset the impairment recorded on the PCI loans. The amount of the increase was recorded in noninterest income and was determined based on the specific loss share agreement, but was generally 80% of the losses. Any increase in expected future cash flows due to a decrease in expected credit losses decreased the accretion of the FDIC Loss Share Receivable prospectively over its remaining life. Increases and decreases to the FDIC Loss Share Receivable were recorded as adjustments to noninterest income. As stipulated in some of its agreements with the FDIC, the Company may have been required to reimburse the FDIC if certain levels of cash flows were met over the duration of a loss share agreement. This reimbursement, or clawback liability, was measured quarterly over the duration of the agreement. Fixed Assets Buildings, leasehold improvements, furniture, fixtures, equipment, and capitalized software are stated at cost less accumulated depreciation. All categories are computed using the straight-line method over their respective estimated useful lives. Furniture, fixtures and equipment is depreciated over three to ten years, buildings and leasehold improvements over ten to forty years, and capitalized software over three years based upon estimated lives or lease obligation periods. State Tax Credits Held for Sale The Company has purchased the rights to receive 10 -year streams of state tax credits at agreed upon discount rates and sells such tax credits to wealth management customers and others. All state tax credits purchased prior to 2009 are accounted for at fair value. All state tax credits purchased since 2009 are accounted for at cost. The Company elected not to account for the state tax credits purchased since 2009 at fair value in order to limit the volatility of the fair value changes in the Company's consolidated statements of operations. Cash Surrender Value of Life Insurance The Company has purchased bank-owned life insurance policies on certain bank officers. Bank-owned life insurance is recorded at its cash surrender value. Changes in the cash surrender values are included in noninterest income. Federal Home Loan Bank Stock The Bank, as a member of the Federal Home Loan Bank of Des Moines (“FHLB”), is required to maintain an investment in the capital stock of the FHLB. The stock is redeemable at par by the FHLB, and is, therefore, carried at cost and periodically evaluated for impairment. The Company records FHLB dividends in interest income on the ex-dividend date. Goodwill and Other Intangible Assets The Company tests goodwill for impairment on an annual basis and whenever events or changes in circumstances indicate that the Company may not be able to recover the respective asset's carrying amount. The Company's annual test for impairment was performed in the fourth quarter of 2015 . Such tests involve the use of estimates and assumptions. Core deposit intangibles are amortized using an accelerated method over an estimated useful life of approximately 10 years. The Company identifies potential goodwill impairments by first performing a qualitative assessment and then by comparing the fair value of a reporting unit to its carrying amount, including goodwill. Goodwill impairment is not indicated as long as it is more likely than not that impairment has not occurred based on the qualitative assessment or based on the quantitative assessment the fair value of the reporting unit is greater than its carrying value. The second step of the impairment test is only required if a goodwill impairment is identified in step one. The second step of the test compares the implied fair value of goodwill to its carrying amount. If the carrying amount of goodwill exceeds its implied fair value, an impairment loss is recognized. That loss is equal to the carrying amount of goodwill that is in excess of its implied fair market value. Impairment of Long-Lived Assets Long-lived assets, such as fixed assets and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposal group classified as held for sale are presented separately in the appropriate asset and liability sections of the balance sheet. Derivative Financial Instruments and Hedging Activities The Company uses derivative financial instruments to assist in the management of interest rate sensitivity and to modify the repricing, maturity and option characteristics of certain assets and liabilities. In addition, the Company also offers an interest rate hedge program that includes interest rate swaps to assist its customers in managing their interest rate risk profile. In order to eliminate the interest rate risk associated with offering these products, the Company enters into derivative contracts with third parties to offset the customer contracts. Derivative instruments are required to be measured at fair value and recognized as either assets or liabilities in the consolidated financial statements. Fair value represents the payment the Company would receive or pay if the item were sold or bought in a current transaction. The accounting for changes in fair value (gains or losses) of a hedged item is dependent on whether the related derivative is designated and qualifies for “hedge accounting.” The Company assigns derivatives to one of these categories at the purchase date: cash flow hedge, fair value hedge, or non-designated derivatives. An assessment of the expected and ongoing hedge effectiveness of any derivative designated a fair value hedge or cash flow hedge is performed as required by the accounting standards. Derivatives are included in other assets and other liabilities in the consolidated balance sheets. Generally, the only derivative instruments used by the Company have been interest rate swaps and interest rate caps. The Company does not currently have derivative instruments designated as fair value or cash flow hedges. Certain derivative financial instruments are not designated as cash flow or as fair value hedges for accounting purposes. These non-designated derivatives are intended to provide interest rate protection on net interest income or noninterest income but do not meet hedge accounting treatment. Customer accommodation interest rate swap contracts are not designated as hedging instruments. Changes in the fair value of these instruments are recorded in interest income or noninterest income in the consolidated statements of income depending on the underlying hedged item. Income Taxes The Company and its subsidiaries file a consolidated federal income tax return. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. We evaluated the need for deferred tax asset valuation allowances based on a more-likely-than-not standard. The ability to realize deferred tax assets depends on the ability to generate sufficient positive taxable income within the carryback or carryforward periods provided for in the laws for each applicable taxing jurisdiction. We consider the following possible sources of taxable income: future reversal patterns of existing taxable temporary differences, future taxable income exclusive of reversing temporary differences, taxable income in prior carryback years and the availability of qualified tax planning strategies. The assessment regarding whether a valuation allowance is required or should be adjusted depends on all available positive and negative factors including, but not limited to, nature, frequency, and severity of recent losses, duration of available carryforward periods, historical experience with tax attributes expiring unused and near and medium term financial outlook. Because of the complexity of tax laws and regulations, interpretation can be difficult and subject to legal judgment given specific facts and circumstances. It is possible that others, given the same information, may at any point in time reach different reasonable conclusions regarding the estimated amounts of accrued taxes. Stock-Based Compensation Stock-based compensation is recognized as an expense in the consolidated financial statements and measured at the grant date fair value for all equity classified awards and recognized over the required service period. Acquisitions and Divestitures The assets and liabilities of the acquired entities have been recorded at their estimated fair values at the date of acquisition. Goodwill represents the excess of the purchase price over the fair value of net assets, including the amount assigned to identifiable intangible assets. The purchase price allocation process requires an estimation of the fair values of the assets acquired and the liabilities assumed. When a business combination agreement provides for an adjustment to the cost of the combination contingent on future events, the Company includes an estimate of the acquisition-date fair value as part of the cost of the combination. The results of operations of the acquired business are included in the Company's consolidated financial statements from the respective date of acquisition. As a general rule, goodwill established in connection with a stock purchase is non-deductible for tax purposes. For divestitures, the Company measures an asset (disposal group) classified as held for sale at the lower of its carrying value at the date the asset is initially classified as held for sale or its fair value less costs to sell. The Company reports the results of operations of an entity or group of components that either has been disposed of or held for sale as discontinued operations only if the disposal of that component represents a strategic shift that has or will have a major effect on an entity's operations and financial results. Any incremental direct costs incurred to transact the sale are allocated against the gain or loss on the sale. These costs would include items like legal fees, title transfer fees, broker fees, etc. Any goodwill and intangible assets associated with the portion of the reporting unit to be disposed of is included in the carrying amount of the business in determining the gain or loss on the sale. The Company has acquired a portfolio of PCI assets through FDIC assisted transactions. The PCI loans acquired were recorded at estimated fair value. As such, there was no allowance for credit losses established related to the acquired loans at the various acquisition dates and no carryover of the related allowance from the failed banks. The loans are accounted for in accordance with guidance for certain loans acquired in a transfer, when the loans have evidence of credit deterioration and it is probable at the date of acquisition that the acquirer will not collect all contractually required principal and interest payments. The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference. Subsequent decreases to the expected cash flows will generally result in a provision for loan losses. Subsequent increases in cash flows result in a reversal of the provision for loan losses to the extent of prior charges and an adjustment in accretable yield, which will have a positive impact on interest income, prospectively. Basic and Diluted Earnings Per Common Share Basic earnings per common share data is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Common shares outstanding include common stock and restricted stock awards where recipients have satisfied the vesting terms. Diluted earnings per common share gives effect to all dilutive potential common shares outstanding during the period using the treasury stock method and the if-converted method for convertible securities related to the issuance of trust preferred securities. Consolidated Statement of Comprehensive Income The Consolidated Statement of Comprehensive Income includes the amount and the related tax impact that have been reclassified from accumulated other comprehensive income to net income. The classification adjustment for unrealized loss/gain on sale of securities included in net income has been recorded through the gain on sale of investment securities line item, within noninterest income, in the Company's Consolidated Statements of Operations.

Acquisitions & Divestitures

Acquisitions & Divestitures	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Acquisitions & Divestitures	ACQUISITIONS & DIVESTITURES Branch Sale On December 6, 2013, the Company sold two of its Kansas City branches to another financial institution. The agreement called for the sale of substantially all of the deposits at these branches, or $78.4 million , as well as cash and cash equivalents of $0.4 million , loans of $7.6 million , and other assets of $1.0 million . The Company recorded a pre-tax gain of $1.0 million upon completion of the transaction primarily attributed to a premium on the deposits sold. As part of this branch sale, the Company also closed two branches in the Kansas City region. In conjunction with the closure, the Company recorded a liability and corresponding expense for the difference between the net present value of future lease payments and its estimated sublease income at one of the closed branches. As of December 31, 2015 , this liability was $0.7 million . The Company recorded expense for the estimated net lease liability of $0.1 million , $0.4 million , and $0.5 million in 2015 , 2014 , and 2013 , respectively. The expense is recorded within other noninterest expense.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The following table presents a summary of per common share data and amounts for the periods indicated. Years ended December 31, (in thousands, except per share data) 2015 2014 2013 Net income as reported $ 38,450 $ 27,173 $ 33,104 Impact of assumed conversions Interest on 9% convertible trust preferred securities, net of income tax — 66 1,015 Net income available to common shareholders and assumed conversions $ 38,450 $ 27,239 $ 34,119 Weighted average common shares outstanding 19,984 19,761 18,582 Incremental shares from assumed conversions of convertible trust preferred securities — 57 1,001 Additional dilutive common stock equivalents 333 292 168 Weighted average diluted common shares outstanding 20,317 20,110 19,751 Basic earnings per common share: $ 1.92 $ 1.38 $ 1.78 Diluted earnings per common share: $ 1.89 $ 1.35 $ 1.73 There were 0.1 million common stock equivalents for fiscal year 2015 ; 0.3 million common stock equivalents for fiscal year 2014 ; and 0.5 million common stock equivalents for fiscal year 2013 , which were excluded from the earnings per share calculations because their effect was anti-dilutive.

Investments

Investments	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investments	INVESTMENTS The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity: December 31, 2015 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 98,699 $ 309 $ — $ 99,008 Obligations of states and political subdivisions 40,700 1,343 (342 ) 41,701 Agency mortgage-backed securities 311,516 2,046 (2,501 ) 311,061 Total securities available for sale $ 450,915 $ 3,698 $ (2,843 ) $ 451,770 Held to maturity securities: Obligations of states and political subdivisions $ 14,831 $ 63 $ (50 ) $ 14,844 Agency mortgage-backed securities 28,883 — (286 ) 28,597 Total securities held to maturity $ 43,714 $ 63 $ (336 ) $ 43,441 December 31, 2014 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 91,355 $ 624 $ (153 ) $ 91,826 Obligations of states and political subdivisions 33,997 1,300 (416 ) 34,881 Agency mortgage-backed securities 271,430 3,577 (1,568 ) 273,439 Total securities available for sale $ 396,782 $ 5,501 $ (2,137 ) $ 400,146 Held to maturity securities: Obligations of states and political subdivisions $ 14,900 $ — $ (325 ) $ 14,575 Agency mortgage-backed securities 31,085 150 (15 ) 31,220 Total securities held to maturity $ 45,985 $ 150 $ (340 ) $ 45,795 At December 31, 2015 , and 2014 , there were no holdings of securities of any one issuer in an amount greater than 10% of shareholders’ equity, other than the U.S. Government agencies and sponsored enterprises. The agency mortgage-backed securities are all issued by U.S. Government-sponsored enterprises. Available for sale securities having a fair value of $334.4 million and $315.8 million at December 31, 2015 , and December 31, 2014 , respectively, were pledged as collateral to secure deposits of public institutions and for other purposes as required by law or contract provisions. During the fourth quarter of 2014, $46.6 million of available for sale securities were transferred to a held to maturity portfolio. The transfers of debt securities into the held to maturity category from the available for sale category were made at fair value at the date of transfer. The unrealized holding gain or loss at the date of transfer was retained in other comprehensive income and in the carrying value of the held to maturity securities. This amount is being amortized over the remaining life of the securities. The amortized cost and estimated fair value of debt securities at December 31, 2015 , by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 4 years. Available for sale Held to maturity (in thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 3,199 $ 3,225 $ — $ — Due after one year through five years 121,522 122,673 4,641 4,662 Due after five years through ten years 11,141 11,543 10,190 10,182 Due after ten years 3,537 3,268 — — Mortgage-backed securities 311,516 311,061 28,883 28,597 $ 450,915 $ 451,770 $ 43,714 $ 43,441 The following table represents a summary of investment securities that had an unrealized loss: December 31, 2015 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of U.S. Government-sponsored enterprises $ — $ — $ — $ — $ — $ — Obligations of states and political subdivisions 2,199 12 9,395 380 11,594 392 Agency mortgage-backed securities 189,229 2,050 21,020 737 210,249 2,787 $ 191,428 $ 2,062 $ 30,415 $ 1,117 $ 221,843 $ 3,179 December 31, 2014 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of U.S. Government-sponsored enterprises $ 5,399 $ 10 $ 24,852 $ 143 $ 30,251 $ 153 Obligations of states and political subdivisions 16,827 343 5,349 398 22,176 741 Agency mortgage-backed securities 26,367 56 97,054 1,527 123,421 1,583 $ 48,593 $ 409 $ 127,255 $ 2,068 $ 175,848 $ 2,477 The unrealized losses at both December 31, 2015 , and 2014 , were primarily attributable to changes in market interest rates since the securities were purchased. Management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include among other considerations (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it is more likely than not that the Company would be required to sell the security before its anticipated recovery in market value. At December 31, 2015 and 2014 , management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired. The gross gains and losses realized from sales of available for sale investment securities were as follows: December 31, (in thousands) 2015 2014 2013 Gross gains realized $ 63 $ — $ 1,477 Gross losses realized (40 ) — (182 ) Proceeds from sales 41,069 — 159,604 Other Investments, At Cost As a member of the FHLB system administered by the Federal Housing Finance Agency, the Bank is required to maintain a minimum investment in capital stock with the FHLB Des Moines consisting of membership stock and activity-based stock. The FHLB capital stock of $8.3 million is recorded at cost, which represents redemption value, and is included in Other investments in the consolidated balance sheets. The remaining amounts in Other investments include the Company's investment in unconsolidated trusts used to issue preferred securities to third parties (see Note 11 – Subordinated Debentures) and various private equity investments.

Portfolio Loans

Portfolio Loans	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Portfolio Loans	PORTFOLIO LOANS Below is a summary of Portfolio loans by category at December 31, 2015 and 2014 : (in thousands) December 31, 2015 December 31, 2014 Commercial and industrial $ 1,484,327 $ 1,264,487 Real estate loans: Commercial - investor owned 428,064 396,751 Commercial - owner occupied 342,959 344,003 Construction and land development 161,061 143,878 Residential 196,498 185,252 Total real estate loans 1,128,582 1,069,884 Consumer and other 137,537 98,650 Portfolio loans 2,750,446 2,433,021 Unearned loan fees, net 291 895 Portfolio loans, including unearned loan fees $ 2,750,737 $ 2,433,916 Note: In 2015, the Company redefined certain loan categories by borrower type and purpose of the loan. To conform to the current year classification, the Company reclassified $36.4 million into Consumer and other loans as of December 31, 2014. This includes $5.8 million from C&I, $16.2 million from CRE-investor owned, $13.5 million from CRE-owner occupied, and $0.9 million from Construction and land development. Following is a summary of activity for the years ended December 31, 2015 , 2014 , and 2013 of loans to executive officers and directors, or to entities in which such individuals had beneficial interests as a shareholder, officer, or director. Such loans were made in the normal course of business on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other customers and did not involve more than the normal risk of collectibility. (in thousands) December 31, 2015 December 31, 2014 December 31, 2013 Balance at beginning of year $ 13,513 $ 11,752 $ 16,875 New loans and advances 641 11,796 6,519 Payments and other reductions (9,760 ) (10,035 ) (11,642 ) Balance at end of year $ 4,394 $ 13,513 $ 11,752 A summary of activity in the allowance for loan losses and the recorded investment in Portfolio loans by class and category based on impairment method for the years ended indicated below is as follows: (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Unallocated Total Balance at Allowance for Loan Losses: Balance, beginning of year $ 16,983 $ 4,382 $ 3,135 $ 1,715 $ 2,830 $ 1,140 $ — $ 30,185 Provision (provision reversal) 6,976 (303 ) (1,626 ) (335 ) (58 ) 218 — 4,872 Losses charged off (3,699 ) (664 ) (38 ) (350 ) (1,313 ) (27 ) — (6,091 ) Recoveries 1,796 69 1,498 674 337 101 — 4,475 Balance, end of year $ 22,056 $ 3,484 $ 2,969 $ 1,704 $ 1,796 $ 1,432 $ — $ 33,441 Balance at Allowance for Loan Losses: Balance, beginning of year $ 12,246 $ 6,600 $ 4,096 $ 2,136 $ 2,019 $ 192 $ — $ 27,289 Provision (provision reversal) 6,707 (2,063 ) (1,517 ) (322 ) 525 1,079 — 4,409 Losses charged off (3,738 ) (250 ) (450 ) (905 ) (48 ) (165 ) — (5,556 ) Recoveries 1,768 95 1,006 806 334 34 — 4,043 Balance, end of year $ 16,983 $ 4,382 $ 3,135 $ 1,715 $ 2,830 $ 1,140 $ — $ 30,185 Balance at Allowance for Loan Losses: Balance, beginning of year $ 10,064 $ 10,403 $ 4,192 $ 5,239 $ 2,026 $ 31 $ 2,375 $ 34,330 Provision (provision reversal) 3,810 (94 ) 410 (2,695 ) 107 195 (2,375 ) (642 ) Losses charged off (3,404 ) (4,441 ) (550 ) (896 ) (1,053 ) (34 ) — (10,378 ) Recoveries 1,776 732 44 488 939 — — 3,979 Balance, end of year $ 12,246 $ 6,600 $ 4,096 $ 2,136 $ 2,019 $ 192 $ — $ 27,289 (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Total Balance December 31, 2015 Allowance for Loan Losses - Ending Balance: Individually evaluated for impairment $ 1,953 $ — $ 6 $ 369 $ 7 $ — $ 2,335 Collectively evaluated for impairment 20,103 3,484 2,963 1,335 1,789 1,432 31,106 Total $ 22,056 $ 3,484 $ 2,969 $ 1,704 $ 1,796 $ 1,432 $ 33,441 Loans - Ending Balance: Individually evaluated for impairment $ 4,514 $ 921 $ 1,962 $ 2,800 $ 681 $ — $ 10,878 Collectively evaluated for impairment 1,479,813 427,143 340,997 158,261 195,817 137,828 2,739,859 Total $ 1,484,327 $ 428,064 $ 342,959 $ 161,061 $ 196,498 $ 137,828 $ 2,750,737 Balance December 31, 2014 Allowance for Loan Losses - Ending Balance: Individually evaluated for impairment $ 704 $ — $ — $ 352 $ 1,052 $ 286 $ 2,394 Collectively evaluated for impairment 16,279 4,382 3,135 1,363 1,778 854 27,791 Total $ 16,983 $ 4,382 $ 3,135 $ 1,715 $ 2,830 $ 1,140 $ 30,185 Loans - Ending Balance: Individually evaluated for impairment $ 5,998 $ 5,036 $ 2,618 $ 6,866 $ 3,082 $ 766 $ 24,366 Collectively evaluated for impairment 1,258,489 391,715 341,385 137,012 182,170 98,779 2,409,550 Total $ 1,264,487 $ 396,751 $ 344,003 $ 143,878 $ 185,252 $ 99,545 $ 2,433,916 A summary of Portfolio loans individually evaluated for impairment by category at December 31, 2015 and 2014 , is as follows: December 31, 2015 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 5,554 $ 509 $ 4,204 $ 4,713 $ 1,953 $ 6,970 Real estate: Commercial - investor owned 927 927 — 927 — 970 Commercial - owner occupied 329 85 113 198 6 301 Construction and land development 4,349 2,914 530 3,444 369 3,001 Residential 705 637 68 705 7 682 Consumer and other — — — — — — Total $ 11,864 $ 5,072 $ 4,915 $ 9,987 $ 2,335 $ 11,924 December 31, 2014 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 8,042 $ 2,609 $ 3,464 $ 6,073 $ 704 $ 4,136 Real estate: Commercial - investor owned 5,036 — 5,187 5,187 — 4,375 Commercial - owner occupied 610 — 519 519 — 1,281 Construction and land development 7,961 419 6,929 7,348 352 7,280 Residential 3,082 2,943 150 3,093 1,052 954 Consumer and other 766 770 — 770 286 581 Total $ 25,497 $ 6,741 $ 16,249 $ 22,990 $ 2,394 $ 18,607 The following table presents details for past due and impaired loans: December 31, (in thousands) 2015 2014 2013 Total interest income that would have been recognized under original terms on impaired loans $ 1,038 $ 1,013 $ 1,538 Total cash received and recognized as interest income on impaired loans 226 118 257 Total interest income recognized on impaired loans still accruing 36 39 16 There were no loans over 90 days past due and still accruing interest at December 31, 2015 or 2014 . At December 31, 2015 , there were $0.01 million of unadvanced commitments on impaired loans. The recorded investment in impaired Portfolio loans by category at December 31, 2015 and 2014 , is as follows: December 31, 2015 (in thousands) Non-accrual Restructured Loans over 90 days past due and still accruing interest Total Commercial and industrial $ 4,406 $ 307 $ — $ 4,713 Real estate: Commercial - investor owned 927 — — 927 Commercial - owner occupied 198 — — 198 Construction and land development 3,444 — — 3,444 Residential 705 — — 705 Consumer and other — — — — Total $ 9,680 $ 307 $ — $ 9,987 December 31, 2014 (in thousands) Non-accrual Restructured Loans over 90 days past due and still accruing interest Total Commercial and industrial $ 6,073 $ — $ — $ 6,073 Real estate: Commercial - investor owned 4,597 590 — 5,187 Commercial - owner occupied 519 — — 519 Construction and land development 7,348 — — 7,348 Residential 3,093 — — 3,093 Consumer and other — 770 — 770 Total $ 21,630 $ 1,360 $ — $ 22,990 The recorded investment by category for the Portfolio loans that have been restructured during the years ended December 31, 2015 and 2014 , is as follows: Year ended December 31, 2015 Year ended December 31, 2014 (in thousands, except for number of loans) Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial 1 $ 303 $ 303 2 $ 658 $ 658 Real estate: Commercial - investor owned — — — 1 603 603 Commercial - owner occupied — — — 2 606 606 Construction and land development — — — 1 2,827 2,827 Residential — — — 1 125 125 Consumer and other — — — 1 1,043 793 Total 1 $ 303 $ 303 8 $ 5,862 $ 5,612 The restructured Portfolio loans primarily resulted from interest rate concessions and changing the terms of the loans. As of December 31, 2015 , the Company allocated $0.2 million of specific reserves to the loans that have been restructured. The recorded investment by category for Portfolio loans that have been restructured and subsequently defaulted during 2015 and 2014 is as follows: Year ended December 31, 2015 Year ended December 31, 2014 (in thousands, except for number of loans) Number of Loans Recorded Balance Number of Loans Recorded Balance Commercial and industrial — $ — — $ — Real estate: Commercial - investor owned — — — — Commercial - owner occupied — — — — Construction and land development — — 1 241 Residential — — — — Consumer and other — — — — Total — $ — 1 $ 241 The aging of the recorded investment in past due Portfolio loans by portfolio class and category at December 31, 2015 and 2014 is shown below. December 31, 2015 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 505 $ 888 $ 1,393 $ 1,482,934 $ 1,484,327 Real estate: Commercial - investor owned 464 — 464 427,600 428,064 Commercial - owner occupied 94 184 278 342,681 342,959 Construction and land development 384 2,273 2,657 158,404 161,061 Residential 70 681 751 195,747 196,498 Consumer and other 20 — 20 137,808 137,828 Total $ 1,537 $ 4,026 $ 5,563 $ 2,745,174 $ 2,750,737 December 31, 2014 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 3,059 $ 232 $ 3,291 $ 1,261,196 $ 1,264,487 Real estate: Commercial - investor owned 261 4,450 4,711 392,040 396,751 Commercial - owner occupied — 496 496 343,507 344,003 Construction and land development 702 2,524 3,226 140,652 143,878 Residential 168 — 168 185,084 185,252 Consumer and other 774 — 774 98,771 99,545 Total $ 4,964 $ 7,702 $ 12,666 $ 2,421,250 $ 2,433,916 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, and current economic factors among other factors. This analysis is performed on a quarterly basis. The Company uses the following definitions for risk ratings: • Grades 1 , 2 , and 3 – Includes loans to borrowers with a continuous record of strong earnings, sound balance sheet condition and capitalization, ample liquidity with solid cash flow, and whose management team has experience and depth within their industry. • Grade 4 – Includes loans to borrowers with positive trends in profitability, satisfactory capitalization and balance sheet condition, and sufficient liquidity and cash flow. • Grade 5 – Includes loans to borrowers that may display fluctuating trends in sales, profitability, capitalization, liquidity, and cash flow. • Grade 6 – Includes loans to borrowers where an adverse change or perceived weakness has occurred, but may be correctable in the near future. Alternatively, this rating category may also include circumstances where the borrower is starting to reverse a negative trend or condition, or has recently been upgraded from a 7 , 8 , or 9 rating. • Grade 7 – Watch credits are borrowers that have experienced financial setback of a nature that is not determined to be severe or influence ‘ongoing concern’ expectations. Although possible, no loss is anticipated, due to strong collateral and/or guarantor support. • Grade 8 – Substandard credits will include those borrowers characterized by significant losses and sustained downward trends in balance sheet condition, liquidity, and cash flow. Repayment reliance may have shifted to secondary sources. Collateral exposure may exist and additional reserves may be warranted. • Grade 9 – Doubtful credits include borrowers that may show deteriorating trends that are unlikely to be corrected. Collateral values may appear insufficient for full recovery, therefore requiring a partial charge-off, or debt renegotiation with the borrower. The borrower may have declared bankruptcy or bankruptcy is likely in the near term. All doubtful rated credits will be on non-accrual. The recorded investment by risk category of the Portfolio loans by portfolio class and category at December 31, 2015 and December 31, 2014 is as follows: December 31, 2015 (in thousands) Pass (1-6) Watch (7) Substandard (8) Doubtful (9) Total Commercial and industrial $ 1,356,864 $ 90,370 $ 37,093 $ — $ 1,484,327 Real estate: Commercial - investor owned 403,820 18,868 5,376 — 428,064 Commercial - owner occupied 314,791 24,727 3,441 — 342,959 Construction and land development 146,601 10,114 4,346 — 161,061 Residential 188,269 5,138 3,091 — 196,498 Consumer and other 131,060 721 6,047 — 137,828 Total $ 2,541,405 $ 149,938 $ 59,394 $ — $ 2,750,737 December 31, 2014 (in thousands) Pass (1-6) Watch (7) Substandard (8) Doubtful (9) Total Commercial and industrial $ 1,161,979 $ 62,315 $ 40,193 $ — $ 1,264,487 Real estate: Commercial - investor owned 361,991 18,640 16,120 — 396,751 Commercial - owner occupied 322,725 18,025 3,253 — 344,003 Construction and land development 122,365 12,993 8,520 — 143,878 Residential 168,543 11,012 5,697 — 185,252 Consumer and other 91,827 5,499 2,219 — 99,545 Total $ 2,229,430 $ 128,484 $ 76,002 $ — $ 2,433,916

Purchase Credit Impaired ("PCI"

Purchase Credit Impaired ("PCI") Loans	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Purchase Credit Impaired (PCI) Loans	PURCHASED CREDIT IMPAIRED ("PCI") LOANS Below is a summary of PCI loans by category at December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 (in thousands) Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Commercial and industrial 6.70 $ 3,863 6.57 $ 4,012 Real estate loans: Commercial - investor owned 6.98 25,272 7.07 39,066 Commercial - owner occupied 6.30 19,414 6.35 22,695 Construction and land development 6.28 6,838 6.16 7,740 Residential 5.44 19,287 5.54 25,121 Total real estate loans 70,811 94,622 Consumer and other 1.89 84 5.39 469 Purchased credit impaired loans $ 74,758 $ 99,103 (1) Risk ratings are based on the borrower's contractual obligation, which is not reflective of the purchase discount. The aging of the recorded investment in past due PCI loans by portfolio class and category at December 31, 2015 and 2014 is shown below: December 31, 2015 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ — $ — $ 3,863 $ 3,863 Real estate: Commercial - investor owned 2,342 3,661 6,003 19,269 25,272 Commercial - owner occupied 731 — 731 18,683 19,414 Construction and land development — — — 6,838 6,838 Residential 1,594 130 1,724 17,563 19,287 Consumer and other 4 — 4 80 84 Total $ 4,671 $ 3,791 $ 8,462 $ 66,296 $ 74,758 December 31, 2014 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ 16 $ 16 $ 3,996 $ 4,012 Real estate: Commercial - investor owned 878 6,484 7,362 31,704 39,066 Commercial - owner occupied — 2,759 2,759 19,936 22,695 Construction and land development 774 — 774 6,966 7,740 Residential 2,020 1,451 3,471 21,650 25,121 Consumer and other — 12 12 457 469 Total $ 3,672 $ 10,722 $ 14,394 $ 84,709 $ 99,103 The following table is a rollforward of PCI loans, net of the allowance for loan losses, for the years ended December 31, 2015 and 2014 . (in thousands) Contractual Cashflows Non-accretable Difference Accretable Yield Carrying Amount Balance January 1, 2015 $ 178,145 $ 65,719 $ 28,733 $ 83,693 Principal reductions and interest payments (24,441 ) — — (24,441 ) Accretion of loan discount — — (10,775 ) 10,775 Changes in contractual and expected cash flows due to remeasurement (3,574 ) (30,413 ) 12,132 14,707 Reductions due to disposals (33,441 ) (8,541 ) (4,749 ) (20,151 ) Balance December 31, 2015 $ 116,689 $ 26,765 $ 25,341 $ 64,583 Balance January 1, 2014 $ 266,068 $ 87,438 $ 53,530 $ 125,100 Principal reductions and interest payments (35,718 ) — — (35,718 ) Accretion of loan discount — — (15,747 ) 15,747 Changes in contractual and expected cash flows due to remeasurement (2,170 ) (7,403 ) (3,234 ) 8,467 Reductions due to disposals (50,035 ) (14,316 ) (5,816 ) (29,903 ) Balance December 31, 2014 $ 178,145 $ 65,719 $ 28,733 $ 83,693 The accretable yield is accreted into interest income over the estimated life of the acquired loans using the effective yield method. A summary of activity in the FDIC loss share receivable for the years ended December 31, 2015 and 2014 is as follows: (in thousands) December 31, 2015 December 31, 2014 Balance at beginning of period $ 15,866 $ 34,319 Adjustments not reflected in income: Cash received from the FDIC for covered assets (3,528 ) (9,605 ) FDIC reimbursable losses (recoveries) (1,386 ) 459 Reductions for loss share termination (5,922 ) — Adjustments reflected in income: Amortization, net (2,293 ) (6,342 ) Loan impairment (impairment reversal) (1,113 ) 841 Reductions for payments on covered assets in excess of expected cash flows (1,624 ) (3,806 ) Balance at end of period $ — $ 15,866 Outstanding customer balances on PCI loans were $98.6 million and $135.3 million as of December 31, 2015 , and December 31, 2014 , respectively. On December 7, 2015, the Company entered into an agreement to terminate all existing loss share agreements with the FDIC. Under the terms of the agreement, the FDIC made a net payment to the bank of $1.3 million . The agreement eliminated the FDIC clawback liability of $3.5 million and the FDIC loss share receivable of $7.2 million . Accordingly, a one-time pretax charge of $2.4 million was recorded in 2015 as a separate component of noninterest expense. See FDIC Loss Share Receivable and Clawback Liability in Note 1 – Summary of Significant Accounting Policies for information on the Company's accounting in prior years.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS The Company is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients and as part of its risk management activities. These instruments include interest rate swaps and option contracts and foreign exchange forward contracts. The Company does not enter into derivative financial instruments for trading purposes. Using derivative instruments can involve assuming counterparty credit risk to varying degrees. Counterparty credit risk relates to the loss the Company could incur if a counterparty were to default on a derivative contract. Notional amounts of derivative financial instruments do not represent credit risk, and are not recorded in the consolidated balance sheet. The overall credit risk and exposure to individual counterparties is monitored. The Company does not anticipate nonperformance by any counterparties. The amount of counterparty credit exposure is the unrealized gains in excess of collateral pledged, if any, on such derivative contracts along with the value of foreign exchange forward contracts. At December 31, 2015 , the Company had $1.2 million of counterparty credit exposure on derivatives. This counterparty risk is considered as part of underwriting and on-going monitoring policies. At December 31, 2015 and 2014 , the Company had pledged cash of $1.3 million and $1.0 million , respectively, as collateral in connection with interest rate swap agreements. Risk Management Instruments . The Company enters into certain derivative contracts to economically hedge state tax credits and certain loans. • Economic hedge of state tax credits. The Company enters into interest rate caps in order to economically hedge changes in fair value of the State tax credits held for sale. See Note 19 – Fair Value Measurements for further discussion of the fair value of the state tax credits. The table below summarizes the notional amounts and fair values of the derivative instruments used to manage risk. Asset Derivatives (Other Assets) Liability Derivatives (Other Liabilities) Notional Amount Fair Value Fair Value (in thousands) December 31, December 31, December 31, December 31, December 31, December 31, Non-designated hedging instruments Interest rate cap contracts $ 3,500 $ 23,800 $ — $ 2 $ — $ — Client-Related Derivative Instruments. The Company enters into interest rate swaps to allow customers to hedge changes in fair value of certain loans. The table below summarizes the notional amounts and fair values of the client-related derivative instruments. Asset Derivatives (Other Assets) Liability Derivatives (Other Liabilities) Notional Amount Fair Value Fair Value (in thousands) December 31, December 31, December 31, December 31, December 31, December 31, Non-designated hedging instruments Interest rate swap contracts $ 153,630 $ 141,263 $ 1,155 $ 907 $ 1,155 $ 907 Changes in the fair value of client-related derivative instruments are recognized currently in operations. For the years ended December 31, 2015 and 2014 , the gains and losses offset each other due to the Company's hedging of the client swaps with other bank counterparties.

Fixed Assets

Fixed Assets	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Fixed Assets	FIXED ASSETS A summary of fixed assets at December 31, 2015 and 2014 , is as follows: December 31, (in thousands) 2015 2014 Land $ 3,103 $ 3,103 Buildings and leasehold improvements 17,837 17,170 Furniture, fixtures and equipment 4,892 3,750 Capitalized software 1,030 735 26,862 24,758 Less accumulated depreciation and amortization 12,020 10,005 Total fixed assets $ 14,842 $ 14,753 Depreciation and amortization of fixed assets included in noninterest expense amounted to $2.0 million , $2.2 million , and $2.8 million in 2015 , 2014 , and 2013 , respectively. The Company has facilities leased under agreements that expire in various years through 2028 . The Company's rent expense totaled $3.1 million , $2.9 million , and $3.0 million in 2015 , 2014 , and 2013 , respectively. Sublease rental income was $0.1 million , $0.2 million , and $0.2 million for 2015 , 2014 , and 2013 , respectively. For leases which renew or are subject to periodic rental adjustments, the monthly rental payments will be adjusted based on current market conditions and rates of inflation. The future aggregate minimum rental commitments (in thousands) required under the leases are shown below: Year Amount 2016 $ 3,019 2017 2,656 2018 2,395 2019 2,388 2020 2,348 Thereafter 8,362 Total $ 21,168

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND INTANGIBLE ASSETS Goodwill has remained at $30.3 million as of December 31, 2015 , 2014 , and 2013 . The annual goodwill impairment evaluations in 2015 , 2014 , and 2013 did not identify any impairment. The table below presents a summary of the intangible assets for the years ended December 31, 2015 and 2014 . (in thousands) Years ended December 31, 2015 2014 Gross core deposit intangible balance, beginning of year $ 9,060 $ 9,060 Accumulated amortization (5,985 ) (4,896 ) Core deposit intangible, net, end of year $ 3,075 $ 4,164 Amortization expense on the core deposit intangibles was $1.1 million , $1.3 million , and $1.6 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. The core deposit intangibles are being amortized over a 10 year period. The following table reflects the expected amortization schedule for the core deposit intangible (in thousands) at December 31, 2015 . Year Core Deposit Intangible 2016 $ 924 2017 760 2018 595 2019 430 2020 265 After 2020 101 $ 3,075

Maturity of Certificates of Dep

Maturity of Certificates of Deposit	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Maturity of Certificates of Deposit	MATURITY OF CERTIFICATES OF DEPOSIT Following is a summary of certificates of deposit maturities at December 31, 2015 : (in thousands) $100,000 and Over Other Total Less than 1 year $ 169,936 $ 61,195 $ 231,131 Greater than 1 year and less than 2 years 13,993 14,844 28,837 Greater than 2 years and less than 3 years 48,619 13,510 62,129 Greater than 3 years and less than 4 years 20,942 7,367 28,309 Greater than 4 years and less than 5 years 3,270 2,503 5,773 Greater than 5 years — 9 9 $ 256,760 $ 99,428 $ 356,188

Subordinated Debentures

Subordinated Debentures	12 Months Ended
	Dec. 31, 2015
Brokers and Dealers [Abstract]
Subordinated Debentures	SUBORDINATED DEBENTURES The Company currently has eight unconsolidated statutory business trusts. These trusts issued preferred securities that were sold to third parties. The sole purpose of the trusts was to invest the proceeds in junior subordinated debentures of the Company that have terms identical to the trust preferred securities. The amounts and terms of each respective issuance at December 31, 2015 and 2014 were as follows: Amount Maturity Date Call Date Interest Rate (in thousands) 2015 2014 EFSC Clayco Statutory Trust I $ 3,196 $ 3,196 December 17, 2033 December 17, 2008 Floats 3MO LIBOR + 2.85% EFSC Capital Trust II 5,155 5,155 June 17, 2034 June 17, 2009 Floats 3MO LIBOR + 2.65% EFSC Statutory Trust III 11,341 11,341 December 15, 2034 December 15, 2009 Floats 3MO LIBOR + 1.97% EFSC Clayco Statutory Trust II 4,124 4,124 September 15, 2035 September 15, 2010 Floats 3MO LIBOR + 1.83% EFSC Statutory Trust IV 10,310 10,310 December 15, 2035 December 15, 2010 Floats 3MO LIBOR + 1.44% EFSC Statutory Trust V 4,124 4,124 September 15, 2036 September 15, 2011 Floats 3MO LIBOR + 1.60% EFSC Capital Trust VI 14,433 14,433 March 30, 2037 March 30, 2012 Floats 3MO LIBOR + 1.60% EFSC Capital Trust VII 4,124 4,124 December 15, 2037 December 15, 2012 Floats 3MO LIBOR + 2.25% Total subordinated debentures $ 56,807 $ 56,807 The subordinated debentures, which are the sole assets of the trusts, are subordinate and junior in right of payment to all present and future senior and subordinated indebtedness and certain other financial conditions of the Company. The Company fully and unconditionally guarantees each trust's securities obligations. Under current regulations, the trust preferred securities are included in Tier 1 capital for regulatory capital purposes, subject to certain limitations. The securities are redeemable in whole or in part on or after their respective call dates. Mandatory redemption dates may be shortened if certain conditions are met. The securities are classified as subordinated debentures in the Company's consolidated balance sheets. Interest on the subordinated debentures held by the trusts is recorded as interest expense in the Company's consolidated statements of operations. The Company's investment of $1.7 million at December 31, 2015 , in these trusts is included in other investments in the consolidated balance sheets. On August 15, 2013, the Company converted $20.0 million of its trust preferred in EFSC Capital Trust VIII into 1.2 million shares of common stock. The Company issued 25,060 shares of additional common stock as an inducement for the conversion. The inducement resulted in a $0.4 million expense recorded in Other noninterest expense during 2013. On March 14, 2014, the remaining $5.0 million trust preferred securities issued through EFSC Capital Trust VIII were converted into 287,852 shares of the Company's common stock at a conversion price of $17.37 .

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2015
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Federal Home Loan Bank Advances	FEDERAL HOME LOAN BANK ADVANCES FHLB advances are collateralized by 1-4 family residential real estate loans, business loans and certain commercial real estate loans. At December 31, 2015 and 2014 , the carrying value of the loans pledged to the FHLB of Des Moines was $633.5 million and $649.7 million , respectively. The secured line of credit had availability of approximately $239.6 million at December 31, 2015 . The Company also has an $8.3 million investment in the capital stock of the FHLB of Des Moines at December 31, 2015 . The following table summarizes the type, maturity, and rate of the Company's FHLB advances at December 31: 2015 2014 (in thousands) Term Outstanding Balance Weighted Rate Outstanding Balance Weighted Rate Non-amortizing fixed advance Less than 1 year $ 110,000 0.45 % $ 144,000 0.28 % Non-amortizing fixed advance Greater than 1 year — — % — — % Total Federal Home Loan Bank Advances $ 110,000 0.45 % $ 144,000 0.28 % In December 2014, the Company prepaid $50 million of FHLB advances with a weighted average interest rate of 3.17% , and a maturity of 3 years, and incurred a prepayment penalty of $2.9 million for asset/liability management purposes. In December 2013, the Company prepaid $30.0 million of FHLB advances with a weighted average interest rate of 4.09% , and a maturity of 3 years, and incurred a prepayment penalty of $2.6 million . In addition to the above advances, at December 31, 2015 , the Company used $11.4 million of collateral value to secure confirming letters of credit for public unit deposits and industrial development bonds.

Other Borrowings and Notes Paya

Other Borrowings and Notes Payable	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Other Borrowings and Notes Payable	OTHER BORROWINGS AND NOTES PAYABLE A summary of other borrowings is as follows: December 31, (in thousands) 2015 2014 Securities sold under repurchase agreements $ 270,326 $ 230,373 Secured borrowings — 3,810 Total $ 270,326 $ 234,183 Average balance during the year $ 195,328 $ 184,964 Maximum balance outstanding at any month-end 270,326 234,183 Average interest rate during the year 0.22 % 0.32 % Average interest rate at December 31 0.16 % 0.30 % Federal Reserve line The Bank also has a line with the Federal Reserve Bank of St. Louis which provides additional liquidity to the Company. As of December 31, 2015 , $815.6 million was available under this line. This line is secured by a pledge of certain eligible loans aggregating $1.1 billion . There were no amounts drawn on the Federal Reserve line of credit as of December 31, 2015 . Term Loan On November 6, 2012, the Company entered into a $12.0 million unsecured term loan agreement ("Term Loan") with another bank with the proceeds being used to redeem the Company's preferred stock held by the U.S. Treasury. The Term Loan was paid off on November 6, 2015, the maturity date of the loan. A summary of the Term Loan is as follows: December 31, (in thousands) 2015 2014 Term Loan $ — $ 5,700 Average balance during the year $ 4,509 $ 6,464 Maximum balance outstanding at any month-end 5,700 6,900 Weighted average interest rate during the year 3.01 % 2.99 % Average interest rate at December 31 — % 2.94 %

Litigation and Other Contingenc

Litigation and Other Contingencies	12 Months Ended
	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Litigation and Other Contingencies	LITIGATION AND OTHER CONTINGENCIES The Company and its subsidiaries are, from time to time, parties to various legal proceedings arising out of their businesses. Management believes that there are no such proceedings pending or threatened against the Company or its subsidiaries which, if determined adversely, would have a material adverse effect on the business, consolidated financial condition, results of operations or cash flows of the Company or any of its subsidiaries.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Regulated Operations [Abstract]
Regulatory Matters	REGULATORY MATTERS Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (set forth in the following table) of total, Tier 1, and Common equity tier 1 capital to risk-weighted assets, and of Tier 1 capital to average assets. Management believes, as of December 31, 2015 and 2014 , that the Company met all capital adequacy requirements to which it is subject. As of December 31, 2015 and 2014 , the Bank was categorized as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized” the Bank must maintain minimum total risk-based capital, Tier 1 risk-based capital, Common equity tier 1 risk-based capital, and Tier 1 leverage ratios as set forth in the table. The actual capital amounts and ratios are presented in the table below: Actual For Capital Adequacy Purposes To Be Well Capitalized Under Applicable Action Provisions (in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2015: Total Capital (to Risk Weighted Assets) Enterprise Financial Services Corp $ 418,367 11.85 % $ 282,442 8.00 % $ — — % Enterprise Bank & Trust 386,531 10.98 281,632 8.00 352,040 10.00 Tier 1 Capital (to Risk Weighted Assets) Enterprise Financial Services Corp 374,676 10.61 211,831 6.00 — — Enterprise Bank & Trust 342,840 9.74 211,224 6.00 281,632 8.00 Common Equity Tier 1 Capital (to Risk Weighted Assets) 1 Enterprise Financial Services Corp 319,553 9.05 158,873 4.50 — — Enterprise Bank & Trust 342,816 9.74 158,418 4.50 228,826 6.50 Leverage Ratio (Tier 1 Capital to Average Assets) Enterprise Financial Services Corp 374,676 10.71 139,893 4.00 — — Enterprise Bank & Trust 342,840 9.84 139,311 4.00 174,138 5.00 As of December 31, 2014: Total Capital (to Risk Weighted Assets) Enterprise Financial Services Corp $ 369,868 13.40 % $ 220,858 8.00 % $ — — % Enterprise Bank & Trust 343,334 12.51 219,645 8.00 274,556 10.00 Tier 1 Capital (to Risk Weighted Assets) Enterprise Financial Services Corp 335,221 12.14 110,429 4.00 — — Enterprise Bank & Trust 308,874 11.25 109,823 4.00 164,734 6.00 Leverage Ratio (Tier 1 Capital to Average Assets) Enterprise Financial Services Corp 335,221 10.48 96,000 3.00 — — Enterprise Bank & Trust 308,874 9.71 95,411 3.00 159,018 5.00 1 Not an applicable regulatory ratio until implementation of Basel III in 2015

Compensation Plans

Compensation Plans	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation Plans	COMPENSATION PLANS The Company has adopted share-based compensation plans to reward and provide long-term incentive for directors and key employees of the Company. These plans provide for the granting of stock, stock options, stock-settled stock appreciation rights ("SSARs"), and restricted stock units (“RSUs”), as designated by the Company's Board of Directors upon the recommendation of the Compensation Committee of the Board. The Company uses authorized and unissued shares to satisfy share award exercises. At December 31, 2015 , there were 415,104 shares available for grant under the various share-based compensation plans. Total share-based compensation expense that was charged against income was $3.6 million , $2.9 million , and $5.0 million for the years ended December 31, 2015 , 2014 , and 2013 respectively. The total income tax benefit/(expense) recognized in additional paid in capital for share-based compensation arrangements was $0.4 million , $0.2 million , and $0.2 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Employee Stock Options and Stock-settled Stock Appreciation Rights In determining compensation cost for stock options and SSARs, the Black-Scholes option-pricing model is used to estimate the fair value on date of grant. There were no grants of employee stock options or SSARs during the years ended December 31, 2015 , 2014 , or 2013 . Stock options have been granted to key employees with exercise prices equal to the market price of the Company's common stock at the date of grant and 10 -year contractual terms. Stock options have a vesting schedule of three to five years. The SSARs are subject to continued employment, have a 10 -year contractual term and vest ratably over five years. Neither stock options nor SSARs carry voting or dividend rights until exercised. At December 31, 2015 , there was no remaining unrecognized compensation expense related to stock options and SSARs and all outstanding awards are vested. Various information related to the stock options and SSARs is shown below. (in thousands) 2015 2014 2013 Compensation expense $ 50 $ 103 $ 213 Intrinsic value of option exercises on date of exercise $ 74 $ 226 $ 300 Cash received from the exercise of stock options $ 126 $ 149 $ 2,040 Following is a summary of the employee stock option and SSAR activity for 2015 . (in thousands, except share and per share data) Shares Weighted Weighted Aggregate Outstanding at January 1, 2015 401,581 $ 19.24 Granted — — Exercised (13,478 ) 21.54 Forfeited — — Outstanding at December 31, 2015 388,103 $ 19.15 2.8 years $ 3,569 Exercisable at December 31, 2015 388,103 $ 19.15 2.8 years $ 3,569 Restricted Stock Units The Company awards nonvested stock, in the form of RSUs to employees. RSUs are subject to continued employment and vest ratably over three to five years. Vesting is accelerated upon a change in control or the employee meeting certain retirement criteria. RSUs do not carry voting or dividend rights until vested. Sales of the units are restricted prior to vesting. Various information related to the RSUs is shown below. (in thousands) 2015 2014 2013 Compensation expense $ 725 $ 945 $ 1,142 Total fair value at vesting date 809 913 828 Total unrecognized compensation cost for nonvested stock units 942 1,462 2,168 Expected years to recognize unearned compensation 1.7 years 2.7 years 3.6 years A summary of the status of the Company's RSU awards as of December 31, 2015 and changes during the year then ended is presented below. Shares Weighted Average Grant Date Fair Value Outstanding at January 1, 2015 139,849 $ 13.81 Granted 6,088 20.69 Vested (58,679 ) 13.79 Forfeited (904 ) 13.33 Outstanding at December 31, 2015 86,354 $ 14.31 Stock Plan for Non-Management Directors The Company has adopted a Stock Plan for Non-Management Directors, which provides for issuing up to 200,000 shares of common stock to non-management directors as compensation in lieu of cash. At December 31, 2015 , there were 42,222 shares of stock available for issuance under the Stock Plan for Non-Management Directors. Various information related to the Director Plan is shown below. (in thousands, except share and per share data) 2015 2014 2013 Shares issued 16,283 23,135 16,990 Weighted average fair value $ 24.43 $ 19.20 $ 15.40 Compensation expense $ 373 $ 329 $ 262 Employee Stock Issuance Restricted stock was issued to certain key employees as part of their compensation. The restricted stock may be in the form of a one-time award or paid in pro rata installments. The stock is restricted for at least 2 years and upon issuance may be fully vested or vest over 5 years . The Company recognized $0.2 million , $0.1 million , and $0.6 million of stock-based compensation expense for the shares issued to the employees in 2015 , 2014 , and 2013 , respectively. The Company issued 14,110 , 34,034 , and 37,943 shares in 2015 , 2014 , and 2013 , respectively. Long-term incentives The Company has entered into long-term incentive agreements with certain key employees. These awards are conditioned on certain performance criteria and market criteria measured against a group of peer banks over a 3 year period for each grant. The awards contain minimum (threshold), target, and maximum (exceptional) performance levels. In the event of a change in control, as defined in the plan, the awards will vest at a minimum of the target level. The amount of the awards are determined at the end of the 3 year vesting and performance period. In January 2016, the Company issued 159,094 shares to employees upon completion of the 2013-2015 performance cycle. In February 2015, the Company issued 122,470 shares to employees upon completion of the 2012-2014 performance cycle. In February 2014, the Company issued 146,700 shares to employees upon completion of the 2011-2013 performance cycle. Information related to the outstanding awards at December 31, 2015 is shown below. (in thousands, except share and per share data) 2014 - 2016 Cycle 2015 - 2017 Cycle Shares issuable at target 107,642 126,000 Maximum shares issuable 141,577 157,250 Unrecognized compensation cost $ 746 $ 1,454 Weighted average grant date fair value $ 16.84 $ 19.21 The Company recorded $2.7 million , $1.8 million and $3.2 million of stock-based compensation expense for these awards during 2015 , 2014 and 2013 , respectively. 401(k) plans The Company has a 401(k) savings plan which covers substantially all full-time employees over the age of 21 . The amount charged to expense for the Company's contributions to the plan was $1.6 million , $1.4 million and $1.2 million for 2015 , 2014 , and 2013 , respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The components of income tax expense for the years ended December 31 are as follows: Years ended December 31, (in thousands) 2015 2014 2013 Current: Federal $ 22,916 $ 9,399 $ 24,029 State and local 2,798 195 2,890 Total current 25,714 9,594 26,919 Deferred: Federal (5,266 ) 3,908 (9,393 ) State and local (497 ) 369 (550 ) Total deferred (5,763 ) 4,277 (9,943 ) Total income tax expense $ 19,951 $ 13,871 $ 16,976 A reconciliation of expected income tax expense, computed by applying the statutory federal income tax rate of 35% in 2015 , 2014 , and 2013 to income before income taxes and the amounts reflected in the consolidated statements of operations is as follows: Years ended December 31, (in thousands) 2015 2014 2013 Income tax expense at statutory rate $ 20,440 $ 14,365 $ 17,528 Increase (reduction) in income tax resulting from: Tax-exempt income, net (931 ) (857 ) (1,128 ) State and local income taxes, net 1,414 741 1,314 Bank-owned life insurance, net (462 ) (535 ) (484 ) Non-deductible expenses 259 290 222 Change in estimated rate for deferred taxes — — 336 Tax benefits of LIHTC investments, net (179 ) (158 ) (204 ) Other, net (590 ) 25 (608 ) Total income tax expense $ 19,951 $ 13,871 $ 16,976 The amount of tax credits and other tax benefits from low-income housing tax credit ("LIHTC") investments recognized during the year were $1.1 million during each of the years ended December 31, 2015 , 2014 , and 2013 . The amount recognized as a component of income tax expense per the table above was $0.3 million for the year ended December 31, 2015 , and $0.2 million for the years ended December 31, 2014 and 2013 . As of December 31, 2015 and 2014 , the carrying value of the investments related to low-income housing tax credits was $2.3 million and $3.2 million , respectively. No impairment losses have been recognized from forfeiture or ineligibility of tax credits or other circumstances during the life of any of the investments. As of December 31, 2015 , the Company has future capital commitments of $0.3 million related to low-income housing tax credit investments. The capital commitments are expected to be called between the years 2016 - 2024. A net deferred income tax asset of $38.5 million and $31.4 million is included in Other assets in the consolidated balance sheets at December 31, 2015 and 2014 , respectively. The tax effect of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities is as follows: Years ended December 31, (in thousands) 2015 2014 Deferred tax assets: Allowance for loan losses $ 16,705 $ 17,463 Basis difference on PCI assets, net 8,806 5,477 Basis difference on Other real estate 328 516 Deferred compensation 4,509 4,854 Goodwill and other intangible assets 6,973 9,001 Accrued compensation 2,222 2,364 Other, net 907 979 Total deferred tax assets $ 40,450 $ 40,654 Deferred tax liabilities: FDIC loss share receivable, net $ — $ 5,542 Unrealized gains on securities available for sale 183 1,091 State tax credits held for sale, net of economic hedge 594 1,051 Core deposit intangibles 1,178 1,595 Total deferred tax liabilities 1,955 9,279 Net deferred tax asset $ 38,495 $ 31,375 A valuation allowance is provided on deferred tax assets when it is more likely than not that some portion of the assets will not be realized. The Company did not have any valuation allowances for federal or state income taxes as of December 31, 2015 or 2014 . The Company and its subsidiaries file income tax returns in the federal jurisdiction and in nine states. The Company is no longer subject to federal, state or local income tax audits by tax authorities for years before 2012, with the exception of 2011 being an open year by one state taxing authority. The Company is not currently under audit by any taxing jurisdiction. The Company recognizes interest and penalties related to uncertain tax positions in income tax expense and classifies such interest and penalties in the liability for unrecognized tax benefits. The amounts accrued for interest and penalties as of December 31, 2015 , 2014 , and 2013 were not significant. As of December 31, 2015 , the gross amount of unrecognized tax benefits was $1.4 million and the total amount of net unrecognized tax benefits that would impact the effective tax rate, if recognized, was $0.9 million . As of December 31, 2014 and 2013 , the total amount of the net unrecognized tax benefits that would impact the effective tax rate, if recognized, was $1.3 million and $0.8 million , respectively. The Company believes it is reasonably possible that the gross amount of unrecognized benefits will be reduced by approximately $0.5 million as a result of a lapse of statute of limitations in the next 12 months. The activity in the gross liability for unrecognized tax benefits was as follows: (in thousands) 2015 2014 2013 Balance at beginning of year $ 1,884 $ 1,257 $ 1,148 Additions based on tax positions related to the current year 230 401 233 Additions for tax positions of prior years 46 523 53 Reductions for tax positions of prior years (437 ) — — Settlements or lapse of statute of limitations (364 ) (297 ) (177 ) Balance at end of year $ 1,359 $ 1,884 $ 1,257

Commitments

Commitments	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments	COMMITMENTS The Company issues financial instruments in the normal course of the business of meeting the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. These instruments may involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company’s extent of involvement and maximum potential exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is not more than the contractual amount of these instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for financial instruments included on its consolidated balance sheets. At December 31, 2015 , there were $0.01 million of unadvanced commitments on impaired loans. Other liabilities include approximately $0.3 million for estimated losses attributable to the unadvanced commitments. At December 31, 2014 , there were $0.2 million of unadvanced commitments on impaired loans. The contractual amounts of off-balance-sheet financial instruments as of December 31, 2015 , and December 31, 2014 , are as follows: (in thousands) December 31, December 31, Commitments to extend credit $ 1,140,028 $ 947,424 Standby letters of credit 54,648 50,108 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments usually have fixed expiration dates or other termination clauses, may have significant usage restrictions, and may require payment of a fee. Of the total commitments to extend credit at December 31, 2015 , and December 31, 2014 , approximately $93.9 million and $65.9 million , respectively, represent fixed rate loan commitments. Since certain of the commitments may expire without being drawn upon or may be revoked, the total commitment amounts do not necessarily represent future cash obligations. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower. Collateral held varies, but may include accounts receivable, inventory, premises and equipment, and real estate. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. These standby letters of credit are issued to support contractual obligations of the Company’s customers. The credit risk involved in issuing letters of credit is essentially the same as the risk involved in extending loans to customers. The approximate remaining term of standby letters of credit range from 1 month to 2 years and 3 months at December 31, 2015 .

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC Topic 820, “Fair Value Measurements and Disclosures,” establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: • Level 1 Inputs - Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. • Level 2 Inputs - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means. • Level 3 Inputs - Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity's own assumptions about the assumptions that market participants would use in pricing the assets or liabilities. Fair value on a recurring basis The following table summarizes financial instruments measured at fair value on a recurring basis as of December 31, 2015 and 2014 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value. December 31, 2015 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 99,008 $ — $ 99,008 Obligations of states and political subdivisions — 38,624 3,077 41,701 Residential mortgage-backed securities — 311,061 — 311,061 Total securities available for sale $ — $ 448,693 $ 3,077 $ 451,770 State tax credits held for sale — — 5,941 5,941 Derivative financial instruments — 1,155 — 1,155 Total assets $ — $ 449,848 $ 9,018 $ 458,866 Liabilities Derivative financial instruments $ — $ 1,155 $ — $ 1,155 Total liabilities $ — $ 1,155 $ — $ 1,155 December 31, 2014 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 91,826 $ — $ 91,826 Obligations of states and political subdivisions — 31,822 3,059 34,881 Residential mortgage-backed securities — 273,439 — 273,439 Total securities available for sale $ — $ 397,087 $ 3,059 $ 400,146 State tax credits held for sale — — 11,689 11,689 Derivative financial instruments — 909 — 909 Total assets $ — $ 397,996 $ 14,748 $ 412,744 Liabilities Derivative financial instruments $ — $ 907 $ — $ 907 Total liabilities $ — $ 907 $ — $ 907 • Securities available for sale . Securities classified as available for sale are reported at fair value utilizing Level 2 and Level 3 inputs. Fair values for Level 2 securities are based upon dealer quotes, market spreads, the U.S. Treasury yield curve, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions at the security level. At December 31, 2015 , Level 3 securities available for sale consist primarily of three Auction Rate Securities that are valued based on the securities' estimated cash flows, yields of comparable securities, and live trading levels. • State tax credits held for sale. At December 31, 2015 , of the $45.9 million of state tax credits held for sale on the consolidated balance sheet, approximately $5.9 million were carried at fair value. The remaining $39.9 million of state tax credits were accounted for at cost. The Company elected not to account for the state tax credits purchased since 2010 at fair value in order to limit the volatility of the fair value changes in our consolidated statements of operations. The Company is not aware of an active market that exists for the 10 -year streams of state tax credit financial instruments. However, the Company’s principal market for these tax credits consists of Missouri state residents who buy these credits and local and regional accounting firms who broker them. As such, the Company employed a discounted cash flow analysis (income approach) to determine the fair value. The fair value measurement is calculated using an internal valuation model with market data including discounted cash flows based upon the terms and conditions of the tax credits. If the underlying project remains in compliance with the various federal and state rules governing the tax credit program, each project will generate about 10 years of tax credits. The inputs to the discounted cash flow calculation include: the amount of tax credits generated each year, the anticipated sale price of the tax credit, the timing of the sale and a discount rate. The discount rate is estimated using the LIBOR swap curve at a point equal to the remaining life in years of credits plus a 205 basis point spread. With the exception of the discount rate, the other inputs to the fair value calculation are observable and readily available. The discount rate is considered a Level 3 input because it is an “unobservable input” and is based on the Company’s assumptions. An increase in the discount rate utilized would generally result in a lower estimated fair value of the tax credits. Alternatively, a decrease in the discount rate utilized would generally result in a higher estimated fair value of the tax credits. Given the significance of this input to the fair value calculation, the state tax credit assets are reported as Level 3 assets. Economically, the Company equates the state tax credits to a fixed rate loan. After considering various risks, such as credit risk, compliance risk, and recapture risk, management concluded the state tax credits are equivalent to a fixed rate loan priced at Prime minus 75 basis points. When pricing a fixed rate loan, most banks utilize the Prime-based swap curve, which is based on the LIBOR swap curve plus a prime equivalent spread of 265 to 285 basis points depending on market pricing and the maturity of the underlying loan. The Prime-based swap curve is available daily on Bloomberg or other national pricing services. As a result, at December 31, 2015 and 2014 , management concluded the spread of 205 basis points to the LIBOR curve should be utilized in the fair value calculation. At December 31, 2015 , the discount rates utilized in our state tax credits fair value calculation ranged from 2.30% to 4.82% . Resulting changes in the fair value of the state tax credits held for sale decreased Gain on state tax credits, net in the consolidated statement of operations by $1.2 million for the year ended December 31, 2015 . • Derivatives . Derivatives are reported at fair value utilizing Level 2 inputs. The Company obtains counterparty quotations to value its interest rate swaps and caps. In addition, the Company validates the counterparty quotations with third party valuation sources. Derivatives with negative fair values are included in Other liabilities in the consolidated balance sheets. Derivatives with positive fair value are included in Other assets in the consolidated balance sheets. Level 3 financial instruments The following table presents the changes in Level 3 financial instruments measured at fair value on a recurring basis as of December 31, 2015 and 2014 . • Purchases, sales, issuances and settlements . There were no Level 3 purchases during the year ended December 31, 2015 . • Transfers in and/or out of Level 3 . There were no transfers in and/or out of Level 3 for the years ending December 31, 2015 and 2014 . Securities available for sale, at fair value Years ended December 31, (in thousands) 2015 2014 Beginning balance $ 3,059 $ 3,040 Total gains: Included in other comprehensive income 18 19 Purchases, sales, issuances and settlements: Purchases — — Transfer in and/or out of Level 3 — — Ending balance $ 3,077 $ 3,059 Change in unrealized gains (losses) relating to $ 18 $ 19 State tax credits held for sale, at fair value Years ended December 31, (in thousands) 2015 2014 Beginning balance $ 11,689 $ 16,491 Total gains: Included in earnings 406 558 Purchases, sales, issuances and settlements: Sales (6,154 ) (5,360 ) Ending balance $ 5,941 $ 11,689 Change in unrealized gains (losses) relating to $ (1,212 ) $ (868 ) Fair value on a non-recurring basis Certain financial assets and financial liabilities are measured at fair value on a non-recurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). • Impaired loans . Impaired loans are included as Portfolio loans on the Company's consolidated balance sheets with amounts specifically reserved for credit impairment in the Allowance for loan losses. On a quarterly basis, fair value adjustments are recorded on impaired loans to account for (1) partial write-downs that are based on the current appraised or market-quoted value of the underlying collateral or (2) the full charge-off of the loan carrying value. In some cases, the properties for which market quotes or appraised values have been obtained are located in areas where comparable sales data is limited, outdated, or unavailable. In addition, the Company may adjust the valuations based on other relevant market conditions or information. Accordingly, fair value estimates, including those obtained from real estate brokers or other third-party consultants, for collateral-dependent impaired loans are classified in Level 3 of the valuation hierarchy. • Other Real Estate. These assets are reported at the lower of the loan carrying amount at foreclosure or fair value. Fair value is based on third party appraisals of each property and the Company's judgment of other relevant market conditions. These are considered Level 3 inputs. The following table presents financial instruments and non-financial assets measured at fair value on a non-recurring basis as of December 31, 2015 and 2014 . December 31, 2015 (1) (1) (1) (1) (in thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant (Level 3) Total losses for the year ended Impaired loans $ 2,561 $ — $ — $ 2,561 $ (6,091 ) Other real estate 753 — — 753 (83 ) Total $ 3,314 $ — $ — $ 3,314 $ (6,174 ) December 31, 2014 (1) (1) (1) (1) (in thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant (Level 3) Total losses for the year ended Impaired loans $ 6,726 $ — $ — $ 6,726 $ (5,556 ) Other real estate 3,788 — — 3,788 (696 ) Total $ 10,514 $ — $ — $ 10,514 $ (6,252 ) (1) The amounts represent only balances measured at fair value during the period and still held as of the reporting date. Impaired loans are reported at the fair value of the underlying collateral. Fair values for impaired loans are obtained from current appraisals by qualified licensed appraisers or independent valuation specialists. Other real estate owned is adjusted to fair value upon foreclosure of the underlying loan. Subsequently, foreclosed assets are carried at the lower of carrying value or fair value less costs to sell. Fair value of other real estate is based upon the current appraised values of the properties as determined by qualified licensed appraisers and the Company’s judgment of other relevant market conditions. Certain state tax credits are reported at cost. Carrying amount and fair value at December 31, 2015 and 2014 Following is a summary of the carrying amounts and fair values of the Company’s financial instruments on the consolidated balance sheets at December 31, 2015 and 2014 . December 31, 2015 December 31, 2014 (in thousands) Carrying Amount Estimated fair value Carrying Amount Estimated fair value Balance sheet assets Cash and due from banks $ 47,935 $ 47,935 $ 42,903 $ 42,903 Federal funds sold 91 91 35 35 Interest-bearing deposits 47,131 47,131 63,058 63,058 Securities available for sale 451,770 451,770 400,146 400,146 Securities held to maturity 43,714 43,441 45,985 45,795 Other investments, at cost 17,455 17,455 17,037 17,037 Loans held for sale 6,598 6,598 4,033 4,033 Derivative financial instruments 1,155 1,155 909 909 Portfolio loans, net 2,781,879 2,782,704 2,487,424 2,482,700 State tax credits, held for sale 45,850 49,588 38,309 42,970 Accrued interest receivable 8,399 8,399 7,956 7,956 Balance sheet liabilities Deposits 2,784,591 2,784,654 2,491,510 2,494,624 Subordinated debentures 56,807 35,432 56,807 34,124 Federal Home Loan Bank advances 110,000 109,994 144,000 144,000 Other borrowings 270,326 270,286 239,883 239,950 Derivative financial instruments 1,155 1,155 907 907 Accrued interest payable 629 629 843 843 The following table presents the level in the fair value hierarchy for the estimated fair values of only the Company’s financial instruments that are not already on the consolidated balance sheets at fair value at December 31, 2015 , and December 31, 2014 . Estimated Fair Value Measurement at Reporting Date Using Balance at (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 43,441 $ — $ 43,441 Portfolio loans, net — — 2,782,704 2,782,704 State tax credits, held for sale — — 43,647 43,647 Financial Liabilities: Deposits 2,428,403 — 356,251 2,784,654 Subordinated debentures — 35,432 — 35,432 Federal Home Loan Bank advances — 109,994 — 109,994 Other borrowings — 270,286 — 270,286 Estimated Fair Value Measurement at Reporting Date Using Balance at (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 45,795 $ — $ 45,795 Portfolio loans, net — — 2,482,700 2,482,700 State tax credits, held for sale — — 31,281 31,281 Financial Liabilities: Deposits 1,986,158 — 508,466 2,494,624 Subordinated debentures — 34,124 — 34,124 Federal Home Loan Bank advances — 144,000 — 144,000 Other borrowings — 239,950 — 239,950 The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practical to estimate such value: Cash, Federal funds sold, and other short-term instruments For cash and due from banks, federal funds purchased, interest-bearing deposits, and accrued interest receivable (payable), the carrying amount is a reasonable estimate of fair value, as such instruments reprice in a short time period (Level 1). Securities available for sale and held to maturity The Company obtains fair value measurements for debt instruments from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions (Level 2). Other investments Other investments, which primarily consists of membership stock in the FHLB, is reported at cost, which approximates fair value (Level 2). Loans held for sale These loans consist of mortgages that are sold on the secondary market generally within three months of origination. They are reported at cost, which approximates fair value (Level 2). Portfolio loans, net The fair value of adjustable-rate loans approximates cost. The fair value of fixed-rate loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers for the same remaining maturities. The fair value of the acquired loans are based on the present value of expected future cash flows (Level 3). The method of estimating fair value does not incorporate the exit-price concept of fair value prescribed by ASC Topic 820. State tax credits held for sale The fair value of state tax credits held for sale is calculated using an internal valuation model with unobservable market data as discussed in further detail above (Level 3). Derivative financial instruments The fair value of derivative financial instruments is based on quoted market prices by the counterparty and verified by the Company using public pricing information (Level 2). Deposits The fair value of demand deposits, interest-bearing transaction accounts, money market accounts and savings deposits is the amount payable on demand at the reporting date (Level 1). The fair value of fixed-maturity certificates of deposit is estimated by discounting the future cash flows using the rates currently offered for deposits of similar remaining maturities (Level 3). Subordinated debentures Fair value of subordinated debentures is based on discounting the future cash flows using rates currently offered for financial instruments of similar remaining maturities (Level 2). Federal Home Loan Bank advances The fair value of the FHLB advances is based on the discounted value of contractual cash flows. The discount rate is estimated using current rates on borrowed money with similar remaining maturities (Level 2). Other borrowed funds Other borrowed funds include customer repurchase agreements, federal funds purchased, notes payable, and secured borrowings related to loan participations. The fair value of federal funds purchased, customer repurchase agreements and notes payable are assumed to be equal to their carrying amount since they have an adjustable interest rate (Level 2). Commitments to extend credit and standby letters of credit The fair value of commitments to extend credit and standby letters of credit are estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, the likelihood of the counterparties drawing on such financial instruments, and the present creditworthiness of such counterparties (Level 2). The Company believes such commitments have been made on terms which are competitive in the markets in which it operates; however, no premium or discount is offered thereon and accordingly, the Company has not assigned a value to such instruments for purposes of this disclosure. Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates are subjective in nature and involve uncertainties and matters of significant judgment, and therefore, cannot be determined with precision. Such estimates include the valuation of loans, goodwill, intangible assets, and other long-lived assets, along with assumptions used in the calculation of income taxes, among others. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. We adjust such estimates and assumptions when facts and circumstances dictate. Decreasing real estate values, illiquid credit markets, volatile equity markets, and declines in consumer spending have combined to increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in estimates resulting from continuing changes in the economic environment will be reflected in the financial statement in future periods. In addition, these estimates do not reflect any premium or discount that could result from offering for sale at one time the Company's entire holdings of a particular financial instrument. Fair value estimates are based on existing on-balance and off-balance-sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in many of the estimates.

Parent Company Only Condensed F

Parent Company Only Condensed Financial Statements	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Only Condensed Financial Statements	PARENT COMPANY ONLY CONDENSED FINANCIAL STATEMENTS Condensed Balance Sheets December 31, (in thousands) 2015 2014 Assets Cash $ 12,032 $ 14,532 Investment in Enterprise Bank & Trust 374,092 344,995 Investment in Enterprise Financial CDE, LLC 1,510 772 Other assets 20,357 19,223 Total assets $ 407,991 $ 379,522 Liabilities and Shareholders' Equity Subordinated debentures $ 56,807 $ 56,807 Notes payable — 5,700 Accounts payable and other liabilities 355 774 Shareholders' equity 350,829 316,241 Total liabilities and shareholders' equity $ 407,991 $ 379,522 Condensed Statements of Operations Years ended December 31, (in thousands) 2015 2014 2013 Income: Dividends from subsidiaries $ 10,000 $ 10,000 $ 10,000 Other 249 225 256 Total income 10,249 10,225 10,256 Expenses: Interest expense-subordinated debentures 1,248 1,322 2,884 Interest expense-notes payable 144 193 396 Other expenses 3,823 4,402 5,142 Total expenses 5,215 5,917 8,422 Income before taxes and equity in undistributed earnings of subsidiaries 5,034 4,308 1,834 Income tax benefit 2,118 2,305 3,394 Net income before equity in undistributed earnings of subsidiaries 7,152 6,613 5,228 Equity in undistributed earnings of subsidiaries 31,298 20,560 27,876 Net income and comprehensive income $ 38,450 $ 27,173 $ 33,104 Condensed Statements of Cash Flows Years Ended December 31, (in thousands) 2015 2014 2013 Cash flows from operating activities: Net income $ 38,450 $ 27,173 $ 33,104 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Share-based compensation 3,601 2,950 5,049 Net income of subsidiaries (41,298 ) (30,560 ) (37,876 ) Dividends from subsidiaries 10,000 10,000 10,000 Excess tax expense of share-based compensation (449 ) (205 ) (222 ) Other, net 848 704 2,004 Net cash provided by operating activities 11,152 10,062 12,059 Cash flows from investing activities: Purchases of other investments (2,832 ) (2,224 ) (761 ) Proceeds from distributions on other investments 880 176 243 Net cash used by investing activities (1,952 ) (2,048 ) (518 ) Cash flows from financing activities: Repayments of notes payable (5,700 ) (4,800 ) (1,200 ) Cash dividends paid (5,259 ) (4,177 ) (3,947 ) Excess tax benefit of share-based compensation 449 205 222 Issuance of common stock 2 2 13 Common stock repurchased — — (1,006 ) Proceeds from the issuance of equity instruments, net (1,192 ) (681 ) 2,266 Net cash used by financing activities (11,700 ) (9,451 ) (3,652 ) Net increase (decrease) in cash and cash equivalents (2,500 ) (1,437 ) 7,889 Cash and cash equivalents, beginning of year 14,532 15,969 8,080 Cash and cash equivalents, end of year $ 12,032 $ 14,532 $ 15,969

Quarterly Condensed Financial I

Quarterly Condensed Financial Information	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Condensed Financial Information	QUARTERLY CONDENSED FINANCIAL INFORMATION (Unaudited) The following table presents the unaudited quarterly financial information for the years ended December 31, 2015 and 2014 : 2015 (in thousands, except per share data) 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Interest income $ 35,096 $ 33,180 $ 32,352 $ 32,151 Interest expense 3,017 3,174 3,072 3,106 Net interest income 32,079 30,006 29,280 29,045 Provision for portfolio loan losses 543 599 2,150 1,580 Provision (provision reversal) for PCI loan losses (917 ) (227 ) — (3,270 ) Net interest income after provision for loan losses 32,453 29,634 27,130 30,735 Noninterest income 6,557 4,729 5,806 3,583 Noninterest expense 22,886 19,932 19,458 19,950 Income before income tax expense 16,124 14,431 13,478 14,368 Income tax expense 5,445 4,722 4,762 5,022 Net income $ 10,679 $ 9,709 $ 8,716 $ 9,346 Earnings per common share: Basic $ 0.53 $ 0.49 $ 0.44 $ 0.47 Diluted 0.52 0.48 0.43 0.46 2014 (in thousands, except per share data) 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Interest income $ 34,385 $ 31,036 $ 32,309 $ 34,024 Interest expense 3,569 3,592 3,567 3,658 Net interest income 30,816 27,444 28,742 30,366 Provision for portfolio loan losses 1,968 66 1,348 1,027 Provision (provision reversal) for PCI loan losses 126 (1,877 ) (470 ) 3,304 Net interest income after provision for loan losses 28,722 29,255 27,864 26,035 Noninterest income 4,852 4,452 3,405 3,922 Noninterest expense 24,795 21,121 20,445 21,102 Income before income tax expense 8,779 12,586 10,824 8,855 Income tax expense 2,812 4,388 3,664 3,007 Net income $ 5,967 $ 8,198 $ 7,160 $ 5,848 Earnings per common share: Basic $ 0.30 $ 0.41 $ 0.36 $ 0.30 Diluted 0.30 0.41 0.36 0.30

New Authoritative Accounting Gu

New Authoritative Accounting Guidance	12 Months Ended
	Dec. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Authoritative Accounting Guidance	NEW AUTHORITATIVE ACCOUNTING GUIDANCE FASB ASU 2014-09, "Revenue from Contracts with Customers" In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle of ASU 2014-09 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying the new guidance, an entity will (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the contract’s performance obligations; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB Accounting Standards Codification. The new guidance was originally effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2016 for public companies. In August 2015, the FASB issued ASU 2015-14, which defers the effective date of this guidance to annual reporting periods beginning after December 15, 2017 for public companies, and permits early adoption on a limited basis. Entities have the option of using either a full retrospective or modified approach to adopt ASU 2014-09. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements, nor decided upon the method of adoption. FASB ASU 2014-11, "Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures" In June 2014, the FASB issued ASU No. 2014-11, "Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures." The objective of ASU 2014-11 is to amend the accounting for certain secured financing transactions, and requires enhanced disclosures with respect to transactions recognized as sales in which exposure to the derecognized asset is retained through a separate agreement with the counterparty. In addition, the guidance requires enhanced disclosures with respect to the types and quality of financial assets pledged in secured financing transactions. The guidance became effective in the first quarter of 2015, except for the disclosures regarding the types and quality of financial assets pledged, which became effective in the second quarter of 2015. The adoption of this guidance did not have a material impact on the Company's consolidated balance sheets or statements of operations. FASB ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis" In February 2015, the FASB issued ASU No. 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis," which changes the guidance with respect to the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. All legal entities are subject to reevaluation under the revised consolidation model. The new guidance affects the following areas: (1) limited partnerships and similar legal entities, (2) evaluating fees paid to a decision maker or a service provider as a variable interest, (3) the effect of fee arrangements on the primary beneficiary determination, (4) the effect of related parties on the primary beneficiary determination, and (5) certain investment funds. This standard became effective in the first quarter of 2016. Early adoption is permitted. The adoption of this guidance will not have a material impact on the Company's consolidated balance sheets or statements of operations. FASB ASU 2015-03, "Interest-Imputation of Interest (Subtopic 835-30): FASB Accounting Standards Codification-Simplifying the Presentation of Debt Issuance Costs" In April 2015, the FASB issued ASU No. 2015-03, "Interest-Imputation of Interest (Subtopic 835-30): FASB Accounting Standards Codification-Simplifying the Presentation of Debt Issuance Costs." ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The objective is to reduce cost and complexity in accounting standards while maintaining the usefulness of information being provided to users of financial statements. The guidance became effective in the first quarter of 2016 and requires the Company to apply the new guidance on a retrospective basis upon adoption. Early adoption is permitted for financial statements that have not been previously issued. The adoption of this guidance will not have a material impact on the Company's consolidated balance sheets. FASB ASU 2016-01 "Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" In January 2016, the FASB issued ASU No. 2016-01, "Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities." ASU 2016-01 requires equity investments to be measured at fair value through earnings, and eliminates the available-for-sale classification for equity securities with readily determinable fair values. For financial liabilities where the fair value option has been elected, changes in fair value due to instrument-specific credit risk must be recognized in other comprehensive income. When measuring the fair value of financial instruments at amortized cost, the exit price must be used for disclosure purposes. The ASU also requires that financial assets and liabilities be presented separately in the notes to the financial statements. This ASU becomes effective for the Company in the first quarter of 2018. Early adoption is permitted. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements, nor decided upon the method of adoption.

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Business and Consolidation	Enterprise Financial Services Corp and subsidiaries (the “Company” or “Enterprise”) is a financial holding company that provides a full range of banking and wealth management services to individuals and corporate customers primarily located in the St. Louis, Kansas City, and Phoenix metropolitan markets through its banking subsidiary, Enterprise Bank & Trust (the “Bank”). The consolidated financial statements include the accounts of the Company, and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated. The Company is subject to competition from other financial and nonfinancial institutions providing financial services in the markets served by the Company's subsidiary. Additionally, the Company and its banking subsidiary are subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory agencies. The Company has one reportable segment.
Use of Estimates	The consolidated financial statements of the Company have been prepared in conformity in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”.) In preparing the consolidated financial statements, management is required to make estimates and assumptions, which significantly affect the reported amounts in the consolidated financial statements. Such estimates include the valuation of loans, goodwill, intangible assets, indemnification assets, and other long-lived assets, along with assumptions used in the calculation of income taxes, among others. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. Decreased real estate values, volatile credit markets, and unemployment have combined to increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.
Cash Flow Information	For purposes of reporting cash flows, the Company considers cash and due from banks, interest-bearing deposits and federal funds sold that mature within 90 days to be cash and cash equivalents.
Investments	The Company has classified all investments in debt securities as available for sale or held to maturity. Securities classified as available for sale are carried at fair value. Unrealized holding gains and losses for available for sale securities are excluded from earnings and reported as a net amount in a separate component of shareholders' equity until realized. All previous fair value adjustments included in the separate component of shareholders' equity are reversed upon sale. Securities classified as held to maturity are carried at historical cost and adjusted for amortization of premiums and accretion of discounts. Declines in the fair value of securities below their cost deemed to be other-than-temporary are reflected in operations as realized losses. In estimating other-than-temporary impairment losses, management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it's more likely than not the Company would be required to sell the security before its anticipated recovery in market value. Premiums and discounts are amortized or accreted over the expected lives of the respective securities as an adjustment to yield using the interest method. Dividend and interest income is recognized when earned. Realized gains and losses are included in earnings and are derived using the specific identification method for determining the cost of securities sold.
Loans Receivable	The Company provides long-term financing of one-to-four-family residential real estate by originating fixed and variable rate loans. Long-term fixed and variable rate loans are sold into the secondary market with limited recourse. Upon receipt of an application for a real estate loan, the Company determines whether the loan will be sold into the secondary market or retained in the Company's loan portfolio. The interest rates on the loans sold are locked with the buyer and the Company bears no interest rate risk related to these loans. Mortgage loans held for sale are carried at the lower of cost or fair value, which is determined on a specific identification method. The Company does not retain servicing on any loans sold, nor did the Company have any capitalized mortgage servicing rights at December 31, 2015 or 2014 . Gains on the sale of loans held for sale are reported net of direct origination fees and costs in the Company's consolidated statements of operations. Portfolio Loans Loans are reported at the principal balance outstanding, net of unearned fees, costs, and premiums or discounts on acquired loans. Loan origination fees, direct origination costs, and premiums or discounts resulting from acquired loans are deferred and recognized over the lives of the related loans as a yield adjustment using the interest method. Interest income on loans is accrued to income based on the principal amount outstanding. The recognition of interest income is discontinued when a loan becomes 90 days past due or a significant deterioration in the borrower's credit has occurred which, in management's judgment, negatively impacts the collectibility of the loan. Unpaid interest on such loans is reversed at the time the loan becomes uncollectible and subsequent interest payments received are applied to principal if any doubt exists as to the collectibility of such principal; otherwise, such receipts are recorded as interest income. Loans that have not been restructured are returned to accrual status when management believes full collectibility of principal and interest is expected. Non-accrual loans that have been restructured will remain in a non-accrual status until the borrower has made at least six months of consecutive contractual payments. Purchased Credit Impaired ("PCI") Loans Loans acquired through the completion of a transfer, including loans acquired in a business combination, that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loans, or the “accretable yield,” is recognized as interest income on a level-yield method over the life of the loans. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized as a yield adjustment or as a loss accrual or a valuation allowance. The Company aggregates individual loans with common risk characteristics into pools of loans. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loans over their remaining lives. Decreases in expected cash flows due to an inability to collect contractual cash flows are recognized as impairment through the provision for loan losses account. Any allowance for loan loss on these pools reflect only losses incurred after the acquisition (meaning the present value of all cash flows expected at acquisition that ultimately are not to be received). Any disposals of loans, including sales of loans, payments in full or foreclosures result in the removal of the loan from the loan pool at the carrying amount with differences in actual results reflected in interest income. Impaired Loans Loans are considered “impaired” when it becomes probable that the Company will be unable to collect all amounts due according to the loan's contractual terms. Non-accrual loans, loans past due greater than 90 days and still accruing, unless adequately secured and in the process of collection, and restructured loans qualify as “impaired loans.” Restructured loans involve the granting of a concession to a borrower experiencing financial difficulty involving the modification of terms of the loan, such as changes in payment schedule or interest rate. When measuring impairment, the expected future cash flows of an impaired loan are discounted at the loan's effective interest rate at origination. Alternatively, impairment can be measured by reference to an observable market price, if one exists, or the fair value of the collateral for a collateral-dependent loan. Interest income on impaired loans is not accrued but is recorded when cash is received and only if principal is considered to be fully collectible. Loans and leases, which are deemed uncollectible, are charged off to the allowance for loan losses, while recoveries of amounts previously charged off are credited to the allowance for loan losses. Impaired loans exclude PCI loans, which are accounted for on a pool basis and are generally considered accruing and performing loans, as the loans accrete interest income over the estimated life of the loan when cash flows are reasonably estimable. Accordingly, PCI loans that are contractually past due may still be considered to be accruing and performing loans. If the timing and amount of future cash flows is not reasonably estimable, the loans may be classified as nonaccrual loans and the purchase price discount on those loans is not recorded as interest income until the timing and amount of future cash flows can be reasonably estimated. See Note 6 – Purchased Credit Impaired Loans for more information on these loans. Loans are generally placed on non-accrual status when contractually past due 90 days or more as to interest or principal payments. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management's practice to place such loans on non-accrual status immediately, rather than delaying such action until the loans become 90 days past due. Previously accrued and uncollected interest on such loans is reversed. Income is recorded only to the extent that a determination has been made that the principal balance of the loan is collectable and the interest payments are subsequently received in cash, or for a restructured loan, the borrower has made six consecutive contractual payments. If collectability of the principal is in doubt, payments received are applied to loan principal. Loans past due 90 days or more but still accruing interest are also generally included in nonperforming loans. Loans past due 90 days or more but still accruing are classified as such where the underlying loans are both well secured (the collateral value is sufficient to cover principal and accrued interest) and are in the process of collection. At December 31, 2015 , we did not have any loans past due greater than 90 days and not included in nonperforming loans. Loan Charge-Offs Loans are charged-off when the primary and secondary sources of repayment (cash flow, collateral, guarantors, etc.) are less than their carrying value.
Allowance for Loan Losses	Allowance For Loan Losses The allowance for loan losses is increased by provision charged to expense and is available to absorb charge-offs, net of recoveries. Management utilizes a systematic, documented approach in determining the appropriate level of the allowance for loan losses. The level of the allowance reflects management's continuing evaluation of industry concentrations; specific credit risks; loan loss experience; current loan portfolio quality; present economic, political and regulatory conditions; and probable losses inherent in the current loan portfolio. The determination of the appropriate level of the allowance for loan losses inherently involves a degree of subjectivity and requires that the Company make significant estimates of current credit risks and future trends, all of which may undergo material changes. Changes in economic conditions affecting borrowers, new information regarding existing loans, identification of additional problem loans and other factors, both within and outside of our control, may require an increase in the allowance for loan losses. Management believes the allowance for loan losses is adequate to absorb inherent losses in the loan portfolio. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions and other factors. In addition, various regulatory agencies, as an integral part of the examination process, periodically review the Bank's loan portfolio. Such agencies may require additions to the allowance for loan losses based on their judgments and interpretations of information available to them at the time of their examinations. Allowance for Loan Losses on PCI Loans The Company updates its cash flow projections for PCI loans on a periodic basis. Assumptions utilized in this process include projections related to probability of default, loss severity, prepayment, extensions and recovery lag. Projections related to probability of default and prepayment are calculated utilizing a loan migration analysis. The loan migration analysis is a matrix of probability that specifies the probability of a loan pool transitioning into a particular delinquency or liquidation state given its current state at the re-measurement date. Loss severity factors are based upon industry data and experience. Any decreases in expected cash flows after the acquisition date and subsequent measurement periods are recognized by recording an impairment in the provision for loan losses. See Purchased Credit Impaired Loans above for further discussion. Any increase in expected future cash flows due to a decrease in expected credit losses will reverse previously recorded impairment, if any, and add to the accretable yield on the loan pool, prospectively.
Other Real Estate	Other real estate represents property acquired through foreclosure or deeded to the Company in lieu of foreclosure on loans on which the borrowers have defaulted on the payment of principal or interest. Other real estate is recorded on an individual asset basis at the lower of cost or fair value less estimated costs to sell. The fair value of other real estate is based upon estimates of future cash flows, market value of similar assets, if available, or independent appraisals. These estimates involve significant uncertainties and judgments. As a result, fair value estimates may not be realizable in a current sale or settlement of the other real estate. Subsequent reductions in fair value are expensed within noninterest expense. Gains and losses resulting from the sale of other real estate are credited or charged to current period earnings. Costs of maintaining and operating other real estate are expensed as incurred, and expenditures to complete or improve other real estate properties are capitalized if the expenditures are expected to be recovered upon ultimate sale of the property.
FDIC Loss Share Receivable and Clawback Liability	As part of FDIC-assisted transactions, the Bank entered into loss sharing agreements with the FDIC from 2009-2011. In 2015, the Bank entered into an agreement with the FDIC to terminate all existing loss sharing agreements. This termination resulted in the removal of the remaining clawback liability of $3.5 million and FDIC receivable of $7.2 million . The following policy discussion refers to transactions prior to December 7, 2015. The FDIC reimbursed the Bank for a percentage of realized losses on loans and foreclosed real estate covered under the agreement (“Covered assets”). In addition, the Bank was reimbursed for certain expenses related to the Covered assets. At the acquisition date, the fair value of the amount due from the FDIC (“FDIC Loss Share Receivable") was estimated based on expected losses and cash flows on the Covered assets. The FDIC Loss Share Receivable was measured separately from the related Covered assets and recorded separately on the balance sheet, because it is not contractually embedded in the Covered assets and was not transferable. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. Subsequent to initial recognition but prior to early termination in the fourth quarter of 2015, the FDIC Loss Share Receivable was reviewed quarterly and adjusted for any changes in expected cash flows. These adjustments were measured on the same basis as the related Covered assets. Any decrease in expected cash flows due to an increase in expected credit losses increased the FDIC Loss Share Receivable which will partially offset the impairment recorded on the PCI loans. The amount of the increase was recorded in noninterest income and was determined based on the specific loss share agreement, but was generally 80% of the losses. Any increase in expected future cash flows due to a decrease in expected credit losses decreased the accretion of the FDIC Loss Share Receivable prospectively over its remaining life. Increases and decreases to the FDIC Loss Share Receivable were recorded as adjustments to noninterest income. As stipulated in some of its agreements with the FDIC, the Company may have been required to reimburse the FDIC if certain levels of cash flows were met over the duration of a loss share agreement. This reimbursement, or clawback liability, was measured quarterly over the duration of the agreement.
Fixed Assets	Buildings, leasehold improvements, furniture, fixtures, equipment, and capitalized software are stated at cost less accumulated depreciation. All categories are computed using the straight-line method over their respective estimated useful lives. Furniture, fixtures and equipment is depreciated over three to ten years, buildings and leasehold improvements over ten to forty years, and capitalized software over three years based upon estimated lives or lease obligation periods.
State Tax Credits Held for Sale	The Company has purchased the rights to receive 10 -year streams of state tax credits at agreed upon discount rates and sells such tax credits to wealth management customers and others. All state tax credits purchased prior to 2009 are accounted for at fair value. All state tax credits purchased since 2009 are accounted for at cost. The Company elected not to account for the state tax credits purchased since 2009 at fair value in order to limit the volatility of the fair value changes in the Company's consolidated statements of operations.
Cash Surrender Value of Life Insurance	The Company has purchased bank-owned life insurance policies on certain bank officers. Bank-owned life insurance is recorded at its cash surrender value. Changes in the cash surrender values are included in noninterest income.
Federal Home Loan Bank Stock	The Bank, as a member of the Federal Home Loan Bank of Des Moines (“FHLB”), is required to maintain an investment in the capital stock of the FHLB. The stock is redeemable at par by the FHLB, and is, therefore, carried at cost and periodically evaluated for impairment. The Company records FHLB dividends in interest income on the ex-dividend date.
Goodwill and Other Intangible Assets	The Company tests goodwill for impairment on an annual basis and whenever events or changes in circumstances indicate that the Company may not be able to recover the respective asset's carrying amount. The Company's annual test for impairment was performed in the fourth quarter of 2015 . Such tests involve the use of estimates and assumptions. Core deposit intangibles are amortized using an accelerated method over an estimated useful life of approximately 10 years. The Company identifies potential goodwill impairments by first performing a qualitative assessment and then by comparing the fair value of a reporting unit to its carrying amount, including goodwill. Goodwill impairment is not indicated as long as it is more likely than not that impairment has not occurred based on the qualitative assessment or based on the quantitative assessment the fair value of the reporting unit is greater than its carrying value. The second step of the impairment test is only required if a goodwill impairment is identified in step one. The second step of the test compares the implied fair value of goodwill to its carrying amount. If the carrying amount of goodwill exceeds its implied fair value, an impairment loss is recognized. That loss is equal to the carrying amount of goodwill that is in excess of its implied fair market value.
Impairment of Long-Lived Assets	Long-lived assets, such as fixed assets and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposal group classified as held for sale are presented separately in the appropriate asset and liability sections of the balance sheet.
Derivative Financial Instruments and Hedging Activities	The Company uses derivative financial instruments to assist in the management of interest rate sensitivity and to modify the repricing, maturity and option characteristics of certain assets and liabilities. In addition, the Company also offers an interest rate hedge program that includes interest rate swaps to assist its customers in managing their interest rate risk profile. In order to eliminate the interest rate risk associated with offering these products, the Company enters into derivative contracts with third parties to offset the customer contracts. Derivative instruments are required to be measured at fair value and recognized as either assets or liabilities in the consolidated financial statements. Fair value represents the payment the Company would receive or pay if the item were sold or bought in a current transaction. The accounting for changes in fair value (gains or losses) of a hedged item is dependent on whether the related derivative is designated and qualifies for “hedge accounting.” The Company assigns derivatives to one of these categories at the purchase date: cash flow hedge, fair value hedge, or non-designated derivatives. An assessment of the expected and ongoing hedge effectiveness of any derivative designated a fair value hedge or cash flow hedge is performed as required by the accounting standards. Derivatives are included in other assets and other liabilities in the consolidated balance sheets. Generally, the only derivative instruments used by the Company have been interest rate swaps and interest rate caps. The Company does not currently have derivative instruments designated as fair value or cash flow hedges. Certain derivative financial instruments are not designated as cash flow or as fair value hedges for accounting purposes. These non-designated derivatives are intended to provide interest rate protection on net interest income or noninterest income but do not meet hedge accounting treatment. Customer accommodation interest rate swap contracts are not designated as hedging instruments. Changes in the fair value of these instruments are recorded in interest income or noninterest income in the consolidated statements of income depending on the underlying hedged item.
Income Taxes	The Company and its subsidiaries file a consolidated federal income tax return. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. We evaluated the need for deferred tax asset valuation allowances based on a more-likely-than-not standard. The ability to realize deferred tax assets depends on the ability to generate sufficient positive taxable income within the carryback or carryforward periods provided for in the laws for each applicable taxing jurisdiction. We consider the following possible sources of taxable income: future reversal patterns of existing taxable temporary differences, future taxable income exclusive of reversing temporary differences, taxable income in prior carryback years and the availability of qualified tax planning strategies. The assessment regarding whether a valuation allowance is required or should be adjusted depends on all available positive and negative factors including, but not limited to, nature, frequency, and severity of recent losses, duration of available carryforward periods, historical experience with tax attributes expiring unused and near and medium term financial outlook. Because of the complexity of tax laws and regulations, interpretation can be difficult and subject to legal judgment given specific facts and circumstances. It is possible that others, given the same information, may at any point in time reach different reasonable conclusions regarding the estimated amounts of accrued taxes.
Stock-Based Compensation	Stock-based compensation is recognized as an expense in the consolidated financial statements and measured at the grant date fair value for all equity classified awards and recognized over the required service period.
Acquisitions and Divestitures	The assets and liabilities of the acquired entities have been recorded at their estimated fair values at the date of acquisition. Goodwill represents the excess of the purchase price over the fair value of net assets, including the amount assigned to identifiable intangible assets. The purchase price allocation process requires an estimation of the fair values of the assets acquired and the liabilities assumed. When a business combination agreement provides for an adjustment to the cost of the combination contingent on future events, the Company includes an estimate of the acquisition-date fair value as part of the cost of the combination. The results of operations of the acquired business are included in the Company's consolidated financial statements from the respective date of acquisition. As a general rule, goodwill established in connection with a stock purchase is non-deductible for tax purposes. For divestitures, the Company measures an asset (disposal group) classified as held for sale at the lower of its carrying value at the date the asset is initially classified as held for sale or its fair value less costs to sell. The Company reports the results of operations of an entity or group of components that either has been disposed of or held for sale as discontinued operations only if the disposal of that component represents a strategic shift that has or will have a major effect on an entity's operations and financial results. Any incremental direct costs incurred to transact the sale are allocated against the gain or loss on the sale. These costs would include items like legal fees, title transfer fees, broker fees, etc. Any goodwill and intangible assets associated with the portion of the reporting unit to be disposed of is included in the carrying amount of the business in determining the gain or loss on the sale. The Company has acquired a portfolio of PCI assets through FDIC assisted transactions. The PCI loans acquired were recorded at estimated fair value. As such, there was no allowance for credit losses established related to the acquired loans at the various acquisition dates and no carryover of the related allowance from the failed banks. The loans are accounted for in accordance with guidance for certain loans acquired in a transfer, when the loans have evidence of credit deterioration and it is probable at the date of acquisition that the acquirer will not collect all contractually required principal and interest payments. The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference. Subsequent decreases to the expected cash flows will generally result in a provision for loan losses. Subsequent increases in cash flows result in a reversal of the provision for loan losses to the extent of prior charges and an adjustment in accretable yield, which will have a positive impact on interest income, prospectively.
Basic and Diluted Earnings Per Common Share	Basic earnings per common share data is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Common shares outstanding include common stock and restricted stock awards where recipients have satisfied the vesting terms. Diluted earnings per common share gives effect to all dilutive potential common shares outstanding during the period using the treasury stock method and the if-converted method for convertible securities related to the issuance of trust preferred securities.
Consolidated Statement of Comprehensive Income	The Consolidated Statement of Comprehensive Income includes the amount and the related tax impact that have been reclassified from accumulated other comprehensive income to net income. The classification adjustment for unrealized loss/gain on sale of securities included in net income has been recorded through the gain on sale of investment securities line item, within noninterest income, in the Company's Consolidated Statements of Operations.
Available-for-sale Securities	Management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include among other considerations (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it is more likely than not that the Company would be required to sell the security before its anticipated recovery in market value. At December 31, 2015 and 2014 , management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired.
New Authoritative Accounting Guidance	FASB ASU 2014-09, "Revenue from Contracts with Customers" In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle of ASU 2014-09 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying the new guidance, an entity will (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the contract’s performance obligations; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB Accounting Standards Codification. The new guidance was originally effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2016 for public companies. In August 2015, the FASB issued ASU 2015-14, which defers the effective date of this guidance to annual reporting periods beginning after December 15, 2017 for public companies, and permits early adoption on a limited basis. Entities have the option of using either a full retrospective or modified approach to adopt ASU 2014-09. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements, nor decided upon the method of adoption. FASB ASU 2014-11, "Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures" In June 2014, the FASB issued ASU No. 2014-11, "Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures." The objective of ASU 2014-11 is to amend the accounting for certain secured financing transactions, and requires enhanced disclosures with respect to transactions recognized as sales in which exposure to the derecognized asset is retained through a separate agreement with the counterparty. In addition, the guidance requires enhanced disclosures with respect to the types and quality of financial assets pledged in secured financing transactions. The guidance became effective in the first quarter of 2015, except for the disclosures regarding the types and quality of financial assets pledged, which became effective in the second quarter of 2015. The adoption of this guidance did not have a material impact on the Company's consolidated balance sheets or statements of operations.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Summary of Per Common Share Data and Amounts	The following table presents a summary of per common share data and amounts for the periods indicated. Years ended December 31, (in thousands, except per share data) 2015 2014 2013 Net income as reported $ 38,450 $ 27,173 $ 33,104 Impact of assumed conversions Interest on 9% convertible trust preferred securities, net of income tax — 66 1,015 Net income available to common shareholders and assumed conversions $ 38,450 $ 27,239 $ 34,119 Weighted average common shares outstanding 19,984 19,761 18,582 Incremental shares from assumed conversions of convertible trust preferred securities — 57 1,001 Additional dilutive common stock equivalents 333 292 168 Weighted average diluted common shares outstanding 20,317 20,110 19,751 Basic earnings per common share: $ 1.92 $ 1.38 $ 1.78 Diluted earnings per common share: $ 1.89 $ 1.35 $ 1.73

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation	The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity: December 31, 2015 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 98,699 $ 309 $ — $ 99,008 Obligations of states and political subdivisions 40,700 1,343 (342 ) 41,701 Agency mortgage-backed securities 311,516 2,046 (2,501 ) 311,061 Total securities available for sale $ 450,915 $ 3,698 $ (2,843 ) $ 451,770 Held to maturity securities: Obligations of states and political subdivisions $ 14,831 $ 63 $ (50 ) $ 14,844 Agency mortgage-backed securities 28,883 — (286 ) 28,597 Total securities held to maturity $ 43,714 $ 63 $ (336 ) $ 43,441 December 31, 2014 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 91,355 $ 624 $ (153 ) $ 91,826 Obligations of states and political subdivisions 33,997 1,300 (416 ) 34,881 Agency mortgage-backed securities 271,430 3,577 (1,568 ) 273,439 Total securities available for sale $ 396,782 $ 5,501 $ (2,137 ) $ 400,146 Held to maturity securities: Obligations of states and political subdivisions $ 14,900 $ — $ (325 ) $ 14,575 Agency mortgage-backed securities 31,085 150 (15 ) 31,220 Total securities held to maturity $ 45,985 $ 150 $ (340 ) $ 45,795
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation	The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity: December 31, 2015 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 98,699 $ 309 $ — $ 99,008 Obligations of states and political subdivisions 40,700 1,343 (342 ) 41,701 Agency mortgage-backed securities 311,516 2,046 (2,501 ) 311,061 Total securities available for sale $ 450,915 $ 3,698 $ (2,843 ) $ 451,770 Held to maturity securities: Obligations of states and political subdivisions $ 14,831 $ 63 $ (50 ) $ 14,844 Agency mortgage-backed securities 28,883 — (286 ) 28,597 Total securities held to maturity $ 43,714 $ 63 $ (336 ) $ 43,441 December 31, 2014 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 91,355 $ 624 $ (153 ) $ 91,826 Obligations of states and political subdivisions 33,997 1,300 (416 ) 34,881 Agency mortgage-backed securities 271,430 3,577 (1,568 ) 273,439 Total securities available for sale $ 396,782 $ 5,501 $ (2,137 ) $ 400,146 Held to maturity securities: Obligations of states and political subdivisions $ 14,900 $ — $ (325 ) $ 14,575 Agency mortgage-backed securities 31,085 150 (15 ) 31,220 Total securities held to maturity $ 45,985 $ 150 $ (340 ) $ 45,795
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of debt securities at December 31, 2015 , by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 4 years. Available for sale Held to maturity (in thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 3,199 $ 3,225 $ — $ — Due after one year through five years 121,522 122,673 4,641 4,662 Due after five years through ten years 11,141 11,543 10,190 10,182 Due after ten years 3,537 3,268 — — Mortgage-backed securities 311,516 311,061 28,883 28,597 $ 450,915 $ 451,770 $ 43,714 $ 43,441
Schedule of Unrealized Loss on Investments	The following table represents a summary of investment securities that had an unrealized loss: December 31, 2015 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of U.S. Government-sponsored enterprises $ — $ — $ — $ — $ — $ — Obligations of states and political subdivisions 2,199 12 9,395 380 11,594 392 Agency mortgage-backed securities 189,229 2,050 21,020 737 210,249 2,787 $ 191,428 $ 2,062 $ 30,415 $ 1,117 $ 221,843 $ 3,179 December 31, 2014 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of U.S. Government-sponsored enterprises $ 5,399 $ 10 $ 24,852 $ 143 $ 30,251 $ 153 Obligations of states and political subdivisions 16,827 343 5,349 398 22,176 741 Agency mortgage-backed securities 26,367 56 97,054 1,527 123,421 1,583 $ 48,593 $ 409 $ 127,255 $ 2,068 $ 175,848 $ 2,477
Schedule of Realized Gain (Loss)	The gross gains and losses realized from sales of available for sale investment securities were as follows: December 31, (in thousands) 2015 2014 2013 Gross gains realized $ 63 $ — $ 1,477 Gross losses realized (40 ) — (182 ) Proceeds from sales 41,069 — 159,604

Portfolio Loans (Tables)

Portfolio Loans (Tables)	12 Months Ended
	Dec. 31, 2015
Non-covered Loans [Line Items]
Summary of Loans to Executive Officers and Directors	Following is a summary of activity for the years ended December 31, 2015 , 2014 , and 2013 of loans to executive officers and directors, or to entities in which such individuals had beneficial interests as a shareholder, officer, or director. Such loans were made in the normal course of business on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other customers and did not involve more than the normal risk of collectibility. (in thousands) December 31, 2015 December 31, 2014 December 31, 2013 Balance at beginning of year $ 13,513 $ 11,752 $ 16,875 New loans and advances 641 11,796 6,519 Payments and other reductions (9,760 ) (10,035 ) (11,642 ) Balance at end of year $ 4,394 $ 13,513 $ 11,752
Summary of Past Due and Impaired Loans	The following table presents details for past due and impaired loans: December 31, (in thousands) 2015 2014 2013 Total interest income that would have been recognized under original terms on impaired loans $ 1,038 $ 1,013 $ 1,538 Total cash received and recognized as interest income on impaired loans 226 118 257 Total interest income recognized on impaired loans still accruing 36 39 16
Non-Covered Loans
Non-covered Loans [Line Items]
Summary of Portfolio Loans by Category	Below is a summary of Portfolio loans by category at December 31, 2015 and 2014 : (in thousands) December 31, 2015 December 31, 2014 Commercial and industrial $ 1,484,327 $ 1,264,487 Real estate loans: Commercial - investor owned 428,064 396,751 Commercial - owner occupied 342,959 344,003 Construction and land development 161,061 143,878 Residential 196,498 185,252 Total real estate loans 1,128,582 1,069,884 Consumer and other 137,537 98,650 Portfolio loans 2,750,446 2,433,021 Unearned loan fees, net 291 895 Portfolio loans, including unearned loan fees $ 2,750,737 $ 2,433,916 Note: In 2015, the Company redefined certain loan categories by borrower type and purpose of the loan. To conform to the current year classification, the Company reclassified $36.4 million into Consumer and other loans as of December 31, 2014. This includes $5.8 million from C&I, $16.2 million from CRE-investor owned, $13.5 million from CRE-owner occupied, and $0.9 million from Construction and land development.
Summary of Allowance for Loan Losses and the Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method	A summary of activity in the allowance for loan losses and the recorded investment in Portfolio loans by class and category based on impairment method for the years ended indicated below is as follows: (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Unallocated Total Balance at Allowance for Loan Losses: Balance, beginning of year $ 16,983 $ 4,382 $ 3,135 $ 1,715 $ 2,830 $ 1,140 $ — $ 30,185 Provision (provision reversal) 6,976 (303 ) (1,626 ) (335 ) (58 ) 218 — 4,872 Losses charged off (3,699 ) (664 ) (38 ) (350 ) (1,313 ) (27 ) — (6,091 ) Recoveries 1,796 69 1,498 674 337 101 — 4,475 Balance, end of year $ 22,056 $ 3,484 $ 2,969 $ 1,704 $ 1,796 $ 1,432 $ — $ 33,441 Balance at Allowance for Loan Losses: Balance, beginning of year $ 12,246 $ 6,600 $ 4,096 $ 2,136 $ 2,019 $ 192 $ — $ 27,289 Provision (provision reversal) 6,707 (2,063 ) (1,517 ) (322 ) 525 1,079 — 4,409 Losses charged off (3,738 ) (250 ) (450 ) (905 ) (48 ) (165 ) — (5,556 ) Recoveries 1,768 95 1,006 806 334 34 — 4,043 Balance, end of year $ 16,983 $ 4,382 $ 3,135 $ 1,715 $ 2,830 $ 1,140 $ — $ 30,185 Balance at Allowance for Loan Losses: Balance, beginning of year $ 10,064 $ 10,403 $ 4,192 $ 5,239 $ 2,026 $ 31 $ 2,375 $ 34,330 Provision (provision reversal) 3,810 (94 ) 410 (2,695 ) 107 195 (2,375 ) (642 ) Losses charged off (3,404 ) (4,441 ) (550 ) (896 ) (1,053 ) (34 ) — (10,378 ) Recoveries 1,776 732 44 488 939 — — 3,979 Balance, end of year $ 12,246 $ 6,600 $ 4,096 $ 2,136 $ 2,019 $ 192 $ — $ 27,289 (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Total Balance December 31, 2015 Allowance for Loan Losses - Ending Balance: Individually evaluated for impairment $ 1,953 $ — $ 6 $ 369 $ 7 $ — $ 2,335 Collectively evaluated for impairment 20,103 3,484 2,963 1,335 1,789 1,432 31,106 Total $ 22,056 $ 3,484 $ 2,969 $ 1,704 $ 1,796 $ 1,432 $ 33,441 Loans - Ending Balance: Individually evaluated for impairment $ 4,514 $ 921 $ 1,962 $ 2,800 $ 681 $ — $ 10,878 Collectively evaluated for impairment 1,479,813 427,143 340,997 158,261 195,817 137,828 2,739,859 Total $ 1,484,327 $ 428,064 $ 342,959 $ 161,061 $ 196,498 $ 137,828 $ 2,750,737 Balance December 31, 2014 Allowance for Loan Losses - Ending Balance: Individually evaluated for impairment $ 704 $ — $ — $ 352 $ 1,052 $ 286 $ 2,394 Collectively evaluated for impairment 16,279 4,382 3,135 1,363 1,778 854 27,791 Total $ 16,983 $ 4,382 $ 3,135 $ 1,715 $ 2,830 $ 1,140 $ 30,185 Loans - Ending Balance: Individually evaluated for impairment $ 5,998 $ 5,036 $ 2,618 $ 6,866 $ 3,082 $ 766 $ 24,366 Collectively evaluated for impairment 1,258,489 391,715 341,385 137,012 182,170 98,779 2,409,550 Total $ 1,264,487 $ 396,751 $ 344,003 $ 143,878 $ 185,252 $ 99,545 $ 2,433,916
Summary of Portfolio Loans Individually Evaluated for Impairment and Recorded Investment in Impaired Non-Covered Loans by Category	A summary of Portfolio loans individually evaluated for impairment by category at December 31, 2015 and 2014 , is as follows: December 31, 2015 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 5,554 $ 509 $ 4,204 $ 4,713 $ 1,953 $ 6,970 Real estate: Commercial - investor owned 927 927 — 927 — 970 Commercial - owner occupied 329 85 113 198 6 301 Construction and land development 4,349 2,914 530 3,444 369 3,001 Residential 705 637 68 705 7 682 Consumer and other — — — — — — Total $ 11,864 $ 5,072 $ 4,915 $ 9,987 $ 2,335 $ 11,924 December 31, 2014 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 8,042 $ 2,609 $ 3,464 $ 6,073 $ 704 $ 4,136 Real estate: Commercial - investor owned 5,036 — 5,187 5,187 — 4,375 Commercial - owner occupied 610 — 519 519 — 1,281 Construction and land development 7,961 419 6,929 7,348 352 7,280 Residential 3,082 2,943 150 3,093 1,052 954 Consumer and other 766 770 — 770 286 581 Total $ 25,497 $ 6,741 $ 16,249 $ 22,990 $ 2,394 $ 18,607
Schedule of Recorded Investment in Impaired Portfolio Loans by Category	The recorded investment in impaired Portfolio loans by category at December 31, 2015 and 2014 , is as follows: December 31, 2015 (in thousands) Non-accrual Restructured Loans over 90 days past due and still accruing interest Total Commercial and industrial $ 4,406 $ 307 $ — $ 4,713 Real estate: Commercial - investor owned 927 — — 927 Commercial - owner occupied 198 — — 198 Construction and land development 3,444 — — 3,444 Residential 705 — — 705 Consumer and other — — — — Total $ 9,680 $ 307 $ — $ 9,987 December 31, 2014 (in thousands) Non-accrual Restructured Loans over 90 days past due and still accruing interest Total Commercial and industrial $ 6,073 $ — $ — $ 6,073 Real estate: Commercial - investor owned 4,597 590 — 5,187 Commercial - owner occupied 519 — — 519 Construction and land development 7,348 — — 7,348 Residential 3,093 — — 3,093 Consumer and other — 770 — 770 Total $ 21,630 $ 1,360 $ — $ 22,990
Summary of Recorded Investment by for Portfolio Loans Restructured	The recorded investment by category for the Portfolio loans that have been restructured during the years ended December 31, 2015 and 2014 , is as follows: Year ended December 31, 2015 Year ended December 31, 2014 (in thousands, except for number of loans) Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial 1 $ 303 $ 303 2 $ 658 $ 658 Real estate: Commercial - investor owned — — — 1 603 603 Commercial - owner occupied — — — 2 606 606 Construction and land development — — — 1 2,827 2,827 Residential — — — 1 125 125 Consumer and other — — — 1 1,043 793 Total 1 $ 303 $ 303 8 $ 5,862 $ 5,612
Summary of Recorded Investment by Category for Portfolio Loans Restructured and Subsequently Defaulted	The recorded investment by category for Portfolio loans that have been restructured and subsequently defaulted during 2015 and 2014 is as follows: Year ended December 31, 2015 Year ended December 31, 2014 (in thousands, except for number of loans) Number of Loans Recorded Balance Number of Loans Recorded Balance Commercial and industrial — $ — — $ — Real estate: Commercial - investor owned — — — — Commercial - owner occupied — — — — Construction and land development — — 1 241 Residential — — — — Consumer and other — — — — Total — $ — 1 $ 241
Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category	The aging of the recorded investment in past due Portfolio loans by portfolio class and category at December 31, 2015 and 2014 is shown below. December 31, 2015 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 505 $ 888 $ 1,393 $ 1,482,934 $ 1,484,327 Real estate: Commercial - investor owned 464 — 464 427,600 428,064 Commercial - owner occupied 94 184 278 342,681 342,959 Construction and land development 384 2,273 2,657 158,404 161,061 Residential 70 681 751 195,747 196,498 Consumer and other 20 — 20 137,808 137,828 Total $ 1,537 $ 4,026 $ 5,563 $ 2,745,174 $ 2,750,737 December 31, 2014 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 3,059 $ 232 $ 3,291 $ 1,261,196 $ 1,264,487 Real estate: Commercial - investor owned 261 4,450 4,711 392,040 396,751 Commercial - owner occupied — 496 496 343,507 344,003 Construction and land development 702 2,524 3,226 140,652 143,878 Residential 168 — 168 185,084 185,252 Consumer and other 774 — 774 98,771 99,545 Total $ 4,964 $ 7,702 $ 12,666 $ 2,421,250 $ 2,433,916
Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category	The recorded investment by risk category of the Portfolio loans by portfolio class and category at December 31, 2015 and December 31, 2014 is as follows: December 31, 2015 (in thousands) Pass (1-6) Watch (7) Substandard (8) Doubtful (9) Total Commercial and industrial $ 1,356,864 $ 90,370 $ 37,093 $ — $ 1,484,327 Real estate: Commercial - investor owned 403,820 18,868 5,376 — 428,064 Commercial - owner occupied 314,791 24,727 3,441 — 342,959 Construction and land development 146,601 10,114 4,346 — 161,061 Residential 188,269 5,138 3,091 — 196,498 Consumer and other 131,060 721 6,047 — 137,828 Total $ 2,541,405 $ 149,938 $ 59,394 $ — $ 2,750,737 December 31, 2014 (in thousands) Pass (1-6) Watch (7) Substandard (8) Doubtful (9) Total Commercial and industrial $ 1,161,979 $ 62,315 $ 40,193 $ — $ 1,264,487 Real estate: Commercial - investor owned 361,991 18,640 16,120 — 396,751 Commercial - owner occupied 322,725 18,025 3,253 — 344,003 Construction and land development 122,365 12,993 8,520 — 143,878 Residential 168,543 11,012 5,697 — 185,252 Consumer and other 91,827 5,499 2,219 — 99,545 Total $ 2,229,430 $ 128,484 $ 76,002 $ — $ 2,433,916

Purchase Credit Impaired ("PC36

Purchase Credit Impaired ("PCI") Loans (Tables)	12 Months Ended
	Dec. 31, 2015
Covered Loans [Line Items]
Rollforward of PCI Loans, Net of Allowance for Loan Losses	The following table is a rollforward of PCI loans, net of the allowance for loan losses, for the years ended December 31, 2015 and 2014 . (in thousands) Contractual Cashflows Non-accretable Difference Accretable Yield Carrying Amount Balance January 1, 2015 $ 178,145 $ 65,719 $ 28,733 $ 83,693 Principal reductions and interest payments (24,441 ) — — (24,441 ) Accretion of loan discount — — (10,775 ) 10,775 Changes in contractual and expected cash flows due to remeasurement (3,574 ) (30,413 ) 12,132 14,707 Reductions due to disposals (33,441 ) (8,541 ) (4,749 ) (20,151 ) Balance December 31, 2015 $ 116,689 $ 26,765 $ 25,341 $ 64,583 Balance January 1, 2014 $ 266,068 $ 87,438 $ 53,530 $ 125,100 Principal reductions and interest payments (35,718 ) — — (35,718 ) Accretion of loan discount — — (15,747 ) 15,747 Changes in contractual and expected cash flows due to remeasurement (2,170 ) (7,403 ) (3,234 ) 8,467 Reductions due to disposals (50,035 ) (14,316 ) (5,816 ) (29,903 ) Balance December 31, 2014 $ 178,145 $ 65,719 $ 28,733 $ 83,693
Covered Loans
Covered Loans [Line Items]
Summary of PCI Loans by Category	Below is a summary of PCI loans by category at December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 (in thousands) Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Commercial and industrial 6.70 $ 3,863 6.57 $ 4,012 Real estate loans: Commercial - investor owned 6.98 25,272 7.07 39,066 Commercial - owner occupied 6.30 19,414 6.35 22,695 Construction and land development 6.28 6,838 6.16 7,740 Residential 5.44 19,287 5.54 25,121 Total real estate loans 70,811 94,622 Consumer and other 1.89 84 5.39 469 Purchased credit impaired loans $ 74,758 $ 99,103 (1) Risk ratings are based on the borrower's contractual obligation, which is not reflective of the purchase discount.
Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category	The aging of the recorded investment in past due PCI loans by portfolio class and category at December 31, 2015 and 2014 is shown below: December 31, 2015 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ — $ — $ 3,863 $ 3,863 Real estate: Commercial - investor owned 2,342 3,661 6,003 19,269 25,272 Commercial - owner occupied 731 — 731 18,683 19,414 Construction and land development — — — 6,838 6,838 Residential 1,594 130 1,724 17,563 19,287 Consumer and other 4 — 4 80 84 Total $ 4,671 $ 3,791 $ 8,462 $ 66,296 $ 74,758 December 31, 2014 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ 16 $ 16 $ 3,996 $ 4,012 Real estate: Commercial - investor owned 878 6,484 7,362 31,704 39,066 Commercial - owner occupied — 2,759 2,759 19,936 22,695 Construction and land development 774 — 774 6,966 7,740 Residential 2,020 1,451 3,471 21,650 25,121 Consumer and other — 12 12 457 469 Total $ 3,672 $ 10,722 $ 14,394 $ 84,709 $ 99,103
Summary of FDIC Loss Share Receivable	A summary of activity in the FDIC loss share receivable for the years ended December 31, 2015 and 2014 is as follows: (in thousands) December 31, 2015 December 31, 2014 Balance at beginning of period $ 15,866 $ 34,319 Adjustments not reflected in income: Cash received from the FDIC for covered assets (3,528 ) (9,605 ) FDIC reimbursable losses (recoveries) (1,386 ) 459 Reductions for loss share termination (5,922 ) — Adjustments reflected in income: Amortization, net (2,293 ) (6,342 ) Loan impairment (impairment reversal) (1,113 ) 841 Reductions for payments on covered assets in excess of expected cash flows (1,624 ) (3,806 ) Balance at end of period $ — $ 15,866

Derivative Financial Instrume37

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Risk Management
Derivative [Line Items]
Schedule of Notional Amounts and Fair Values of Derivative Instruments and Client-Related Derivative Instruments	The table below summarizes the notional amounts and fair values of the derivative instruments used to manage risk. Asset Derivatives (Other Assets) Liability Derivatives (Other Liabilities) Notional Amount Fair Value Fair Value (in thousands) December 31, December 31, December 31, December 31, December 31, December 31, Non-designated hedging instruments Interest rate cap contracts $ 3,500 $ 23,800 $ — $ 2 $ — $ —
Client-Related
Derivative [Line Items]
Schedule of Notional Amounts and Fair Values of Derivative Instruments and Client-Related Derivative Instruments	The table below summarizes the notional amounts and fair values of the client-related derivative instruments. Asset Derivatives (Other Assets) Liability Derivatives (Other Liabilities) Notional Amount Fair Value Fair Value (in thousands) December 31, December 31, December 31, December 31, December 31, December 31, Non-designated hedging instruments Interest rate swap contracts $ 153,630 $ 141,263 $ 1,155 $ 907 $ 1,155 $ 907
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	Changes in the fair value of client-related derivative instruments are recognized currently in operations. For the years ended December 31, 2015 and 2014 , the gains and losses offset each other due to the Company's hedging of the client swaps with other bank counterparties.

Fixed Assets (Tables)

Fixed Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Summary of Fixed Assets	A summary of fixed assets at December 31, 2015 and 2014 , is as follows: December 31, (in thousands) 2015 2014 Land $ 3,103 $ 3,103 Buildings and leasehold improvements 17,837 17,170 Furniture, fixtures and equipment 4,892 3,750 Capitalized software 1,030 735 26,862 24,758 Less accumulated depreciation and amortization 12,020 10,005 Total fixed assets $ 14,842 $ 14,753
Future Aggregate Minimum Rental Commitments	The future aggregate minimum rental commitments (in thousands) required under the leases are shown below: Year Amount 2016 $ 3,019 2017 2,656 2018 2,395 2019 2,388 2020 2,348 Thereafter 8,362 Total $ 21,168

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The table below presents a summary of the intangible assets for the years ended December 31, 2015 and 2014 . (in thousands) Years ended December 31, 2015 2014 Gross core deposit intangible balance, beginning of year $ 9,060 $ 9,060 Accumulated amortization (5,985 ) (4,896 ) Core deposit intangible, net, end of year $ 3,075 $ 4,164
Expected Amortization Schedule for the Core Deposit Intangible	The following table reflects the expected amortization schedule for the core deposit intangible (in thousands) at December 31, 2015 . Year Core Deposit Intangible 2016 $ 924 2017 760 2018 595 2019 430 2020 265 After 2020 101 $ 3,075

Maturity of Certificates of D40

Maturity of Certificates of Deposit (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Summary of Certificates of Deposit Maturities	Following is a summary of certificates of deposit maturities at December 31, 2015 : (in thousands) $100,000 and Over Other Total Less than 1 year $ 169,936 $ 61,195 $ 231,131 Greater than 1 year and less than 2 years 13,993 14,844 28,837 Greater than 2 years and less than 3 years 48,619 13,510 62,129 Greater than 3 years and less than 4 years 20,942 7,367 28,309 Greater than 4 years and less than 5 years 3,270 2,503 5,773 Greater than 5 years — 9 9 $ 256,760 $ 99,428 $ 356,188

Subordinated Debentures (Tables

Subordinated Debentures (Tables)	12 Months Ended
	Dec. 31, 2015
Brokers and Dealers [Abstract]
Schedule of Subordinated Debentures	The amounts and terms of each respective issuance at December 31, 2015 and 2014 were as follows: Amount Maturity Date Call Date Interest Rate (in thousands) 2015 2014 EFSC Clayco Statutory Trust I $ 3,196 $ 3,196 December 17, 2033 December 17, 2008 Floats 3MO LIBOR + 2.85% EFSC Capital Trust II 5,155 5,155 June 17, 2034 June 17, 2009 Floats 3MO LIBOR + 2.65% EFSC Statutory Trust III 11,341 11,341 December 15, 2034 December 15, 2009 Floats 3MO LIBOR + 1.97% EFSC Clayco Statutory Trust II 4,124 4,124 September 15, 2035 September 15, 2010 Floats 3MO LIBOR + 1.83% EFSC Statutory Trust IV 10,310 10,310 December 15, 2035 December 15, 2010 Floats 3MO LIBOR + 1.44% EFSC Statutory Trust V 4,124 4,124 September 15, 2036 September 15, 2011 Floats 3MO LIBOR + 1.60% EFSC Capital Trust VI 14,433 14,433 March 30, 2037 March 30, 2012 Floats 3MO LIBOR + 1.60% EFSC Capital Trust VII 4,124 4,124 December 15, 2037 December 15, 2012 Floats 3MO LIBOR + 2.25% Total subordinated debentures $ 56,807 $ 56,807

Federal Home Loan Bank Advanc42

Federal Home Loan Bank Advances (Tables)	12 Months Ended
	Dec. 31, 2015
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances [Table Text Block]	2015 2014 (in thousands) Term Outstanding Balance Weighted Rate Outstanding Balance Weighted Rate Non-amortizing fixed advance Less than 1 year $ 110,000 0.45 % $ 144,000 0.28 % Non-amortizing fixed advance Greater than 1 year — — % — — % Total Federal Home Loan Bank Advances $ 110,000 0.45 % $ 144,000 0.28 %

Other Borrowings and Notes Pa43

Other Borrowings and Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2015
Other Borrowings
Debt Instrument [Line Items]
Summary of Other Borrowings	A summary of other borrowings is as follows: December 31, (in thousands) 2015 2014 Securities sold under repurchase agreements $ 270,326 $ 230,373 Secured borrowings — 3,810 Total $ 270,326 $ 234,183 Average balance during the year $ 195,328 $ 184,964 Maximum balance outstanding at any month-end 270,326 234,183 Average interest rate during the year 0.22 % 0.32 % Average interest rate at December 31 0.16 % 0.30 %
Unsecured Term Loan
Debt Instrument [Line Items]
Summary of Other Borrowings	A summary of the Term Loan is as follows: December 31, (in thousands) 2015 2014 Term Loan $ — $ 5,700 Average balance during the year $ 4,509 $ 6,464 Maximum balance outstanding at any month-end 5,700 6,900 Weighted average interest rate during the year 3.01 % 2.99 % Average interest rate at December 31 — % 2.94 %

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2015
Regulated Operations [Abstract]
Schedule of Actual Capital Amounts and Ratios	The actual capital amounts and ratios are presented in the table below: Actual For Capital Adequacy Purposes To Be Well Capitalized Under Applicable Action Provisions (in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2015: Total Capital (to Risk Weighted Assets) Enterprise Financial Services Corp $ 418,367 11.85 % $ 282,442 8.00 % $ — — % Enterprise Bank & Trust 386,531 10.98 281,632 8.00 352,040 10.00 Tier 1 Capital (to Risk Weighted Assets) Enterprise Financial Services Corp 374,676 10.61 211,831 6.00 — — Enterprise Bank & Trust 342,840 9.74 211,224 6.00 281,632 8.00 Common Equity Tier 1 Capital (to Risk Weighted Assets) 1 Enterprise Financial Services Corp 319,553 9.05 158,873 4.50 — — Enterprise Bank & Trust 342,816 9.74 158,418 4.50 228,826 6.50 Leverage Ratio (Tier 1 Capital to Average Assets) Enterprise Financial Services Corp 374,676 10.71 139,893 4.00 — — Enterprise Bank & Trust 342,840 9.84 139,311 4.00 174,138 5.00 As of December 31, 2014: Total Capital (to Risk Weighted Assets) Enterprise Financial Services Corp $ 369,868 13.40 % $ 220,858 8.00 % $ — — % Enterprise Bank & Trust 343,334 12.51 219,645 8.00 274,556 10.00 Tier 1 Capital (to Risk Weighted Assets) Enterprise Financial Services Corp 335,221 12.14 110,429 4.00 — — Enterprise Bank & Trust 308,874 11.25 109,823 4.00 164,734 6.00 Leverage Ratio (Tier 1 Capital to Average Assets) Enterprise Financial Services Corp 335,221 10.48 96,000 3.00 — — Enterprise Bank & Trust 308,874 9.71 95,411 3.00 159,018 5.00 1 Not an applicable regulatory ratio until implementation of Basel III in 2015

Compensation Plans (Tables)

Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Long Term Incentive Awards [Table Text Block]	(in thousands, except share and per share data) 2014 - 2016 Cycle 2015 - 2017 Cycle Shares issuable at target 107,642 126,000 Maximum shares issuable 141,577 157,250 Unrecognized compensation cost $ 746 $ 1,454 Weighted average grant date fair value $ 16.84 $ 19.21
Summary of Employee Stock Option and SSARs Activity	Following is a summary of the employee stock option and SSAR activity for 2015 . (in thousands, except share and per share data) Shares Weighted Weighted Aggregate Outstanding at January 1, 2015 401,581 $ 19.24 Granted — — Exercised (13,478 ) 21.54 Forfeited — — Outstanding at December 31, 2015 388,103 $ 19.15 2.8 years $ 3,569 Exercisable at December 31, 2015 388,103 $ 19.15 2.8 years $ 3,569
Summary of Restricted Stock Units Activity	A summary of the status of the Company's RSU awards as of December 31, 2015 and changes during the year then ended is presented below. Shares Weighted Average Grant Date Fair Value Outstanding at January 1, 2015 139,849 $ 13.81 Granted 6,088 20.69 Vested (58,679 ) 13.79 Forfeited (904 ) 13.33 Outstanding at December 31, 2015 86,354 $ 14.31
Stock Options and SSARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Various Information	Various information related to the stock options and SSARs is shown below. (in thousands) 2015 2014 2013 Compensation expense $ 50 $ 103 $ 213 Intrinsic value of option exercises on date of exercise $ 74 $ 226 $ 300 Cash received from the exercise of stock options $ 126 $ 149 $ 2,040
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Various Information	Various information related to the RSUs is shown below. (in thousands) 2015 2014 2013 Compensation expense $ 725 $ 945 $ 1,142 Total fair value at vesting date 809 913 828 Total unrecognized compensation cost for nonvested stock units 942 1,462 2,168 Expected years to recognize unearned compensation 1.7 years 2.7 years 3.6 years
Stock Plan for Non-Management Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Various Information	Various information related to the Director Plan is shown below. (in thousands, except share and per share data) 2015 2014 2013 Shares issued 16,283 23,135 16,990 Weighted average fair value $ 24.43 $ 19.20 $ 15.40 Compensation expense $ 373 $ 329 $ 262

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of income tax expense for the years ended December 31 are as follows: Years ended December 31, (in thousands) 2015 2014 2013 Current: Federal $ 22,916 $ 9,399 $ 24,029 State and local 2,798 195 2,890 Total current 25,714 9,594 26,919 Deferred: Federal (5,266 ) 3,908 (9,393 ) State and local (497 ) 369 (550 ) Total deferred (5,763 ) 4,277 (9,943 ) Total income tax expense $ 19,951 $ 13,871 $ 16,976
Schedule of Income Tax Rate Reconciliation	A reconciliation of expected income tax expense, computed by applying the statutory federal income tax rate of 35% in 2015 , 2014 , and 2013 to income before income taxes and the amounts reflected in the consolidated statements of operations is as follows: Years ended December 31, (in thousands) 2015 2014 2013 Income tax expense at statutory rate $ 20,440 $ 14,365 $ 17,528 Increase (reduction) in income tax resulting from: Tax-exempt income, net (931 ) (857 ) (1,128 ) State and local income taxes, net 1,414 741 1,314 Bank-owned life insurance, net (462 ) (535 ) (484 ) Non-deductible expenses 259 290 222 Change in estimated rate for deferred taxes — — 336 Tax benefits of LIHTC investments, net (179 ) (158 ) (204 ) Other, net (590 ) 25 (608 ) Total income tax expense $ 19,951 $ 13,871 $ 16,976
Schedule of Deferred Tax Assets and Deferred Tax Liabilities	The tax effect of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities is as follows: Years ended December 31, (in thousands) 2015 2014 Deferred tax assets: Allowance for loan losses $ 16,705 $ 17,463 Basis difference on PCI assets, net 8,806 5,477 Basis difference on Other real estate 328 516 Deferred compensation 4,509 4,854 Goodwill and other intangible assets 6,973 9,001 Accrued compensation 2,222 2,364 Other, net 907 979 Total deferred tax assets $ 40,450 $ 40,654 Deferred tax liabilities: FDIC loss share receivable, net $ — $ 5,542 Unrealized gains on securities available for sale 183 1,091 State tax credits held for sale, net of economic hedge 594 1,051 Core deposit intangibles 1,178 1,595 Total deferred tax liabilities 1,955 9,279 Net deferred tax asset $ 38,495 $ 31,375
Schedule of Unrecognized Tax Benefits	The activity in the gross liability for unrecognized tax benefits was as follows: (in thousands) 2015 2014 2013 Balance at beginning of year $ 1,884 $ 1,257 $ 1,148 Additions based on tax positions related to the current year 230 401 233 Additions for tax positions of prior years 46 523 53 Reductions for tax positions of prior years (437 ) — — Settlements or lapse of statute of limitations (364 ) (297 ) (177 ) Balance at end of year $ 1,359 $ 1,884 $ 1,257

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments	The contractual amounts of off-balance-sheet financial instruments as of December 31, 2015 , and December 31, 2014 , are as follows: (in thousands) December 31, December 31, Commitments to extend credit $ 1,140,028 $ 947,424 Standby letters of credit 54,648 50,108

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Summary of Financial Instruments Measured at Fair Value on a Recurring Basis	The following table summarizes financial instruments measured at fair value on a recurring basis as of December 31, 2015 and 2014 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value. December 31, 2015 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 99,008 $ — $ 99,008 Obligations of states and political subdivisions — 38,624 3,077 41,701 Residential mortgage-backed securities — 311,061 — 311,061 Total securities available for sale $ — $ 448,693 $ 3,077 $ 451,770 State tax credits held for sale — — 5,941 5,941 Derivative financial instruments — 1,155 — 1,155 Total assets $ — $ 449,848 $ 9,018 $ 458,866 Liabilities Derivative financial instruments $ — $ 1,155 $ — $ 1,155 Total liabilities $ — $ 1,155 $ — $ 1,155 December 31, 2014 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 91,826 $ — $ 91,826 Obligations of states and political subdivisions — 31,822 3,059 34,881 Residential mortgage-backed securities — 273,439 — 273,439 Total securities available for sale $ — $ 397,087 $ 3,059 $ 400,146 State tax credits held for sale — — 11,689 11,689 Derivative financial instruments — 909 — 909 Total assets $ — $ 397,996 $ 14,748 $ 412,744 Liabilities Derivative financial instruments $ — $ 907 $ — $ 907 Total liabilities $ — $ 907 $ — $ 907
Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis	The following table presents the changes in Level 3 financial instruments measured at fair value on a recurring basis as of December 31, 2015 and 2014 . • Purchases, sales, issuances and settlements . There were no Level 3 purchases during the year ended December 31, 2015 . • Transfers in and/or out of Level 3 . There were no transfers in and/or out of Level 3 for the years ending December 31, 2015 and 2014 . Securities available for sale, at fair value Years ended December 31, (in thousands) 2015 2014 Beginning balance $ 3,059 $ 3,040 Total gains: Included in other comprehensive income 18 19 Purchases, sales, issuances and settlements: Purchases — — Transfer in and/or out of Level 3 — — Ending balance $ 3,077 $ 3,059 Change in unrealized gains (losses) relating to $ 18 $ 19 State tax credits held for sale, at fair value Years ended December 31, (in thousands) 2015 2014 Beginning balance $ 11,689 $ 16,491 Total gains: Included in earnings 406 558 Purchases, sales, issuances and settlements: Sales (6,154 ) (5,360 ) Ending balance $ 5,941 $ 11,689 Change in unrealized gains (losses) relating to $ (1,212 ) $ (868 )
Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis	The following table presents financial instruments and non-financial assets measured at fair value on a non-recurring basis as of December 31, 2015 and 2014 . December 31, 2015 (1) (1) (1) (1) (in thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant (Level 3) Total losses for the year ended Impaired loans $ 2,561 $ — $ — $ 2,561 $ (6,091 ) Other real estate 753 — — 753 (83 ) Total $ 3,314 $ — $ — $ 3,314 $ (6,174 ) December 31, 2014 (1) (1) (1) (1) (in thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant (Level 3) Total losses for the year ended Impaired loans $ 6,726 $ — $ — $ 6,726 $ (5,556 ) Other real estate 3,788 — — 3,788 (696 ) Total $ 10,514 $ — $ — $ 10,514 $ (6,252 ) (1) The amounts represent only balances measured at fair value during the period and still held as of the reporting date.
Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets	Following is a summary of the carrying amounts and fair values of the Company’s financial instruments on the consolidated balance sheets at December 31, 2015 and 2014 . December 31, 2015 December 31, 2014 (in thousands) Carrying Amount Estimated fair value Carrying Amount Estimated fair value Balance sheet assets Cash and due from banks $ 47,935 $ 47,935 $ 42,903 $ 42,903 Federal funds sold 91 91 35 35 Interest-bearing deposits 47,131 47,131 63,058 63,058 Securities available for sale 451,770 451,770 400,146 400,146 Securities held to maturity 43,714 43,441 45,985 45,795 Other investments, at cost 17,455 17,455 17,037 17,037 Loans held for sale 6,598 6,598 4,033 4,033 Derivative financial instruments 1,155 1,155 909 909 Portfolio loans, net 2,781,879 2,782,704 2,487,424 2,482,700 State tax credits, held for sale 45,850 49,588 38,309 42,970 Accrued interest receivable 8,399 8,399 7,956 7,956 Balance sheet liabilities Deposits 2,784,591 2,784,654 2,491,510 2,494,624 Subordinated debentures 56,807 35,432 56,807 34,124 Federal Home Loan Bank advances 110,000 109,994 144,000 144,000 Other borrowings 270,326 270,286 239,883 239,950 Derivative financial instruments 1,155 1,155 907 907 Accrued interest payable 629 629 843 843
Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet	The following table presents the level in the fair value hierarchy for the estimated fair values of only the Company’s financial instruments that are not already on the consolidated balance sheets at fair value at December 31, 2015 , and December 31, 2014 . Estimated Fair Value Measurement at Reporting Date Using Balance at (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 43,441 $ — $ 43,441 Portfolio loans, net — — 2,782,704 2,782,704 State tax credits, held for sale — — 43,647 43,647 Financial Liabilities: Deposits 2,428,403 — 356,251 2,784,654 Subordinated debentures — 35,432 — 35,432 Federal Home Loan Bank advances — 109,994 — 109,994 Other borrowings — 270,286 — 270,286 Estimated Fair Value Measurement at Reporting Date Using Balance at (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 45,795 $ — $ 45,795 Portfolio loans, net — — 2,482,700 2,482,700 State tax credits, held for sale — — 31,281 31,281 Financial Liabilities: Deposits 1,986,158 — 508,466 2,494,624 Subordinated debentures — 34,124 — 34,124 Federal Home Loan Bank advances — 144,000 — 144,000 Other borrowings — 239,950 — 239,950

Parent Company Only Condensed49

Parent Company Only Condensed Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	Condensed Balance Sheets December 31, (in thousands) 2015 2014 Assets Cash $ 12,032 $ 14,532 Investment in Enterprise Bank & Trust 374,092 344,995 Investment in Enterprise Financial CDE, LLC 1,510 772 Other assets 20,357 19,223 Total assets $ 407,991 $ 379,522 Liabilities and Shareholders' Equity Subordinated debentures $ 56,807 $ 56,807 Notes payable — 5,700 Accounts payable and other liabilities 355 774 Shareholders' equity 350,829 316,241 Total liabilities and shareholders' equity $ 407,991 $ 379,522
Condensed Statements of Operations	Condensed Statements of Operations Years ended December 31, (in thousands) 2015 2014 2013 Income: Dividends from subsidiaries $ 10,000 $ 10,000 $ 10,000 Other 249 225 256 Total income 10,249 10,225 10,256 Expenses: Interest expense-subordinated debentures 1,248 1,322 2,884 Interest expense-notes payable 144 193 396 Other expenses 3,823 4,402 5,142 Total expenses 5,215 5,917 8,422 Income before taxes and equity in undistributed earnings of subsidiaries 5,034 4,308 1,834 Income tax benefit 2,118 2,305 3,394 Net income before equity in undistributed earnings of subsidiaries 7,152 6,613 5,228 Equity in undistributed earnings of subsidiaries 31,298 20,560 27,876 Net income and comprehensive income $ 38,450 $ 27,173 $ 33,104
Condensed Statements of Cash Flow	Condensed Statements of Cash Flows Years Ended December 31, (in thousands) 2015 2014 2013 Cash flows from operating activities: Net income $ 38,450 $ 27,173 $ 33,104 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Share-based compensation 3,601 2,950 5,049 Net income of subsidiaries (41,298 ) (30,560 ) (37,876 ) Dividends from subsidiaries 10,000 10,000 10,000 Excess tax expense of share-based compensation (449 ) (205 ) (222 ) Other, net 848 704 2,004 Net cash provided by operating activities 11,152 10,062 12,059 Cash flows from investing activities: Purchases of other investments (2,832 ) (2,224 ) (761 ) Proceeds from distributions on other investments 880 176 243 Net cash used by investing activities (1,952 ) (2,048 ) (518 ) Cash flows from financing activities: Repayments of notes payable (5,700 ) (4,800 ) (1,200 ) Cash dividends paid (5,259 ) (4,177 ) (3,947 ) Excess tax benefit of share-based compensation 449 205 222 Issuance of common stock 2 2 13 Common stock repurchased — — (1,006 ) Proceeds from the issuance of equity instruments, net (1,192 ) (681 ) 2,266 Net cash used by financing activities (11,700 ) (9,451 ) (3,652 ) Net increase (decrease) in cash and cash equivalents (2,500 ) (1,437 ) 7,889 Cash and cash equivalents, beginning of year 14,532 15,969 8,080 Cash and cash equivalents, end of year $ 12,032 $ 14,532 $ 15,969

Quarterly Condensed Financial50

Quarterly Condensed Financial Information (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The following table presents the unaudited quarterly financial information for the years ended December 31, 2015 and 2014 : 2015 (in thousands, except per share data) 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Interest income $ 35,096 $ 33,180 $ 32,352 $ 32,151 Interest expense 3,017 3,174 3,072 3,106 Net interest income 32,079 30,006 29,280 29,045 Provision for portfolio loan losses 543 599 2,150 1,580 Provision (provision reversal) for PCI loan losses (917 ) (227 ) — (3,270 ) Net interest income after provision for loan losses 32,453 29,634 27,130 30,735 Noninterest income 6,557 4,729 5,806 3,583 Noninterest expense 22,886 19,932 19,458 19,950 Income before income tax expense 16,124 14,431 13,478 14,368 Income tax expense 5,445 4,722 4,762 5,022 Net income $ 10,679 $ 9,709 $ 8,716 $ 9,346 Earnings per common share: Basic $ 0.53 $ 0.49 $ 0.44 $ 0.47 Diluted 0.52 0.48 0.43 0.46 2014 (in thousands, except per share data) 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Interest income $ 34,385 $ 31,036 $ 32,309 $ 34,024 Interest expense 3,569 3,592 3,567 3,658 Net interest income 30,816 27,444 28,742 30,366 Provision for portfolio loan losses 1,968 66 1,348 1,027 Provision (provision reversal) for PCI loan losses 126 (1,877 ) (470 ) 3,304 Net interest income after provision for loan losses 28,722 29,255 27,864 26,035 Noninterest income 4,852 4,452 3,405 3,922 Noninterest expense 24,795 21,121 20,445 21,102 Income before income tax expense 8,779 12,586 10,824 8,855 Income tax expense 2,812 4,388 3,664 3,007 Net income $ 5,967 $ 8,198 $ 7,160 $ 5,848 Earnings per common share: Basic $ 0.30 $ 0.41 $ 0.36 $ 0.30 Diluted 0.30 0.41 0.36 0.30

Summary of Significant Accoun51

Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)segment	Dec. 31, 2014USD ($)
Property, Plant and Equipment [Line Items]
Removal of remaining clawback liability, FDIC loss share termination	$ 3.5
Removal of remaining FDIC receivable, FDIC loss share termination	$ 7.2
Number of reportable segments | segment	1
Required reserves on deposits maintained	$ 13.8	$ 16.1
Minimum period of consecutive contractual payments to no longer be considered in nonaccrual status	6 years
Percentage of losses from loss share agreements in noninterest income	80.00%
Finite-lived intangible assets useful life	10 years	10 years
Furniture, Fixtures and Equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	3 years
Furniture, Fixtures and Equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	10 years
Building and Leasehold Improvements [Member] | Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	10 years
Building and Leasehold Improvements [Member] | Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	40 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment useful life	3 years
Core Deposits [Member]
Property, Plant and Equipment [Line Items]
Finite-lived intangible assets useful life	10 years
State and Local Jurisdiction [Member]
Property, Plant and Equipment [Line Items]
Right to receive state tax credit at agreed upon rates	10 years

Acquisitions & Divestitures - N

Acquisitions & Divestitures - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)branch	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 06, 2013USD ($)
Business Combinations [Abstract]
Number of branches sold | branch	2
Sale of deposits as part of branch sale				$ 78.4
Sale of cash and cash equivalents as part of branch sale				0.4
Sale of loans as part of branch sale				7.6
Sale of other assets as part of branch sale				$ 1
Gain on sale of branches	$ 1
Branches closed | branch	2
Lease abandonment expense	$ 0.1	$ 0.4	$ 0.5
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lease abandonment liability	$ 0.7

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income as reported	$ 10,679	$ 9,709	$ 8,716	$ 9,346	$ 5,967	$ 8,198	$ 7,160	$ 5,848	$ 38,450	$ 27,173	$ 33,104
Impact of assumed conversions
Interest on 9% convertible trust preferred securities, net of income tax									0	66	1,015
Net income available to common shareholders and assumed conversions									$ 38,450	$ 27,239	$ 34,119
Weighted average common shares outstanding (in shares)									19,984,000	19,761,000	18,582,000
Incremental shares from assumed conversions of convertible trust preferred securities (in shares)									0	57,000	1,001,000
Additional dilutive common stock equivalents (in shares)									333,000	292,000	168,000
Weighted average diluted common shares outstanding (in shares)									20,317,000	20,110,000	19,751,000
Basic earnings per common share (in dollars per share)	$ 0.53	$ 0.49	$ 0.44	$ 0.47	$ 0.30	$ 0.41	$ 0.36	$ 0.30	$ 1.92	$ 1.38	$ 1.78
Diluted earnings per common share (in dollars per share)	$ 0.52	$ 0.48	$ 0.43	$ 0.46	$ 0.30	$ 0.41	$ 0.36	$ 0.30	$ 1.89	$ 1.35	$ 1.73
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)									79,670	287,546	517,694
Convertible Debt Securities
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Convertible trust preferred securities, interest rate, stated percentage	9.00%				9.00%				9.00%	9.00%	9.00%

Investments - Schedule of Avail

Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 43,714	$ 45,985
Gross Unrealized Gains	63	150
Gross Unrealized Losses	(336)	(340)
Fair Value	43,441	45,795
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	450,915	396,782
Gross Unrealized Gains	3,698	5,501
Gross Unrealized Losses	(2,843)	(2,137)
Fair Value	451,770	400,146
Obligations of U.S. Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	98,699	91,355
Gross Unrealized Gains	309	624
Gross Unrealized Losses	0	(153)
Fair Value	99,008	91,826
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,700	33,997
Gross Unrealized Gains	1,343	1,300
Gross Unrealized Losses	(342)	(416)
Fair Value	41,701	34,881
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	311,516	271,430
Gross Unrealized Gains	2,046	3,577
Gross Unrealized Losses	(2,501)	(1,568)
Fair Value	311,061	273,439
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	14,831	14,900
Gross Unrealized Gains	63	0
Gross Unrealized Losses	(50)	(325)
Fair Value	14,844	14,575
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	28,883	31,085
Gross Unrealized Gains	0	150
Gross Unrealized Losses	(286)	(15)
Fair Value	$ 28,597	$ 31,220

Investments - Investments Class

Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available for sale, Amortized Cost
Due in one year or less	$ 3,199
Due after one year through five years	121,522
Due after five years through ten years	11,141
Due after ten years	3,537
Mortgage-backed securities	311,516
Amortized Cost	450,915	$ 396,782
Available for sale, Estimated Fair Value
Due in one year or less	3,225
Due after one year through five years	122,673
Due after five years through ten years	11,543
Due after ten years	3,268
Mortgage-backed securities	311,061
Securities available for sale	451,770	400,146
Held to maturity, Amortized Cost
Due in one year or less	0
Due after one year through five years	4,641
Due after five years through ten years	10,190
Due after ten years	0
Mortgage-backed securities	28,883
Amortized Cost	43,714	45,985
Held to maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	4,662
Due after five years through ten years	10,182
Due after ten years	0
Mortgage-backed securities	28,597
Held to maturity, fair value	$ 43,441	$ 45,795

Investments - Schedule of Unrea

Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 191,428	$ 48,593
Less than 12 months, unrealized losses	2,062	409
12 months or more, fair value	30,415	127,255
12 months or more, unrealized losses	1,117	2,068
Total, fair value	221,843	175,848
Total, unrealized losses	3,179	2,477
Obligations of U.S. Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	0	5,399
Less than 12 months, unrealized losses	0	10
12 months or more, fair value	0	24,852
12 months or more, unrealized losses	0	143
Total, fair value	0	30,251
Total, unrealized losses	0	153
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	2,199	16,827
Less than 12 months, unrealized losses	12	343
12 months or more, fair value	9,395	5,349
12 months or more, unrealized losses	380	398
Total, fair value	11,594	22,176
Total, unrealized losses	392	741
Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	189,229	26,367
Less than 12 months, unrealized losses	2,050	56
12 months or more, fair value	21,020	97,054
12 months or more, unrealized losses	737	1,527
Total, fair value	210,249	123,421
Total, unrealized losses	$ 2,787	$ 1,583

Investments - Schedule of Reali

Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Gross gains realized	$ 63	$ 0	$ 1,477
Gross losses realized	(40)	0	(182)
Proceeds from sales	$ 41,069	$ 0	$ 159,604

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Other investments, at cost	$ 17,037	$ 17,455
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%	10.00%
Available-for-sale securities pledged as collateral, fair value	$ 315,800	$ 334,400
Available for sale securities transferred to held to maturity		46,600
Mortgage-backed securities, weighted average life	4 years
Des Moines
Schedule of Available-for-sale Securities [Line Items]
Other investments, at cost		$ 8,300

Portfolio Loans - Summary of Po

Portfolio Loans - Summary of Portfolio Loans by Category (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, including unearned loan fees	$ 2,750,737	$ 2,433,916
Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	2,750,446	2,433,021
Unearned loan fees, net	291	895
Portfolio loans, including unearned loan fees	2,750,737	2,433,916
Non-Covered Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	161,061	143,878
Non-Covered Loans | Commercial - Investor Owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	428,064	396,751
Non-Covered Loans | Commercial - Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	342,959	344,003
Non-Covered Loans | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	196,498	185,252
Non-Covered Loans | Total real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,128,582	1,069,884
Non-Covered Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,484,327	1,264,487
Non-Covered Loans | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	137,537	98,650
Portfolio loans, including unearned loan fees	$ 137,828	$ 99,545

Portfolio Loans - Summary of Lo

Portfolio Loans - Summary of Loans to Executive Officers and Directors (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance at beginning of year	$ 13,513	$ 11,752	$ 16,875
New loans and advances	641	11,796	6,519
Payments and other reductions	(9,760)	(10,035)	(11,642)
Balance at end of year	$ 4,394	$ 13,513	$ 11,752

Portfolio Loans - Summary of Al

Portfolio Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - Non-Covered Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	$ 30,185	$ 27,289	$ 34,330
Provision (provision reversal)	4,872	4,409	(642)
Losses charged off	6,091	5,556	10,378
Recoveries	4,475	4,043	3,979
Balance, end of year	33,441	30,185	27,289
Commercial and industrial
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	16,983	12,246	10,064
Provision (provision reversal)	6,976	6,707	3,810
Losses charged off	(3,699)	(3,738)	(3,404)
Recoveries	1,796	1,768	1,776
Balance, end of year	22,056	16,983	12,246
CRE - investor owned
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	3,135	4,096	4,192
Provision (provision reversal)	(1,626)	(1,517)	410
Losses charged off	(38)	(450)	(550)
Recoveries	1,498	1,006	44
Balance, end of year	2,969	3,135	4,096
CRE - owner occupied
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	4,382	6,600	10,403
Provision (provision reversal)	(303)	(2,063)	(94)
Losses charged off	664	(250)	(4,441)
Recoveries	69	95	732
Balance, end of year	3,484	4,382	6,600
Construction and land development
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	1,715	2,136	5,239
Provision (provision reversal)	(335)	(322)	(2,695)
Losses charged off	(350)	(905)	(896)
Recoveries	674	806	488
Balance, end of year	1,704	1,715	2,136
Residential real estate
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	2,830	2,019	2,026
Provision (provision reversal)	(58)	525	107
Losses charged off	(1,313)	(48)	(1,053)
Recoveries	337	334	939
Balance, end of year	1,796	2,830	2,019
Consumer and other
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	1,140	192	31
Provision (provision reversal)	218	1,079	195
Losses charged off	(27)	(165)	(34)
Recoveries	101	34	0
Balance, end of year	1,432	1,140	192
Unallocated
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	0	0	2,375
Provision (provision reversal)	0	0	(2,375)
Losses charged off	0	0	0
Recoveries	0	0	0
Balance, end of year	$ 0	$ 0	$ 0

Portfolio Loans - Summary of Re

Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans - Ending Balance:
Portfolio loans, including unearned loan fees	$ 2,750,737	$ 2,433,916
Non-Covered Loans
Balance December 31, 2015
Individually evaluated for impairment	2,335	2,394
Collectively evaluated for impairment	31,106	27,791
Total	33,441	30,185	$ 27,289	$ 34,330
Loans - Ending Balance:
Individually evaluated for impairment	10,878	24,366
Collectively evaluated for impairment	2,739,859	2,409,550
Total	2,750,446	2,433,021
Portfolio loans, including unearned loan fees	2,750,737	2,433,916
Provision for Loan, Lease, and Other Losses	4,872	4,409	(642)
Financing Receivable, Allowance for Credit Losses, Write-downs	(6,091)	(5,556)	(10,378)
Financing Receivable, Allowance for Credit Losses, Recovery	4,475	4,043	3,979
Non-Covered Loans | Commercial and industrial
Balance December 31, 2015
Individually evaluated for impairment	1,953	704
Collectively evaluated for impairment	20,103	16,279
Total	22,056	16,983	12,246	10,064
Loans - Ending Balance:
Individually evaluated for impairment	4,514	5,998
Collectively evaluated for impairment	1,479,813	1,258,489
Total	1,484,327	1,264,487
Provision for Loan, Lease, and Other Losses	6,976	6,707	3,810
Financing Receivable, Allowance for Credit Losses, Write-downs	3,699	3,738	3,404
Financing Receivable, Allowance for Credit Losses, Recovery	1,796	1,768	1,776
Non-Covered Loans | CRE - owner occupied
Balance December 31, 2015
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3,484	4,382
Total	3,484	4,382	6,600	10,403
Loans - Ending Balance:
Individually evaluated for impairment	921	5,036
Collectively evaluated for impairment	427,143	391,715
Total	428,064	396,751
Provision for Loan, Lease, and Other Losses	(303)	(2,063)	(94)
Financing Receivable, Allowance for Credit Losses, Write-downs	(664)	250	4,441
Financing Receivable, Allowance for Credit Losses, Recovery	69	95	732
Non-Covered Loans | CRE - investor owned
Balance December 31, 2015
Individually evaluated for impairment	6	0
Collectively evaluated for impairment	2,963	3,135
Total	2,969	3,135	4,096	4,192
Loans - Ending Balance:
Individually evaluated for impairment	1,962	2,618
Collectively evaluated for impairment	340,997	341,385
Total	342,959	344,003
Provision for Loan, Lease, and Other Losses	(1,626)	(1,517)	410
Financing Receivable, Allowance for Credit Losses, Write-downs	38	450	550
Financing Receivable, Allowance for Credit Losses, Recovery	1,498	1,006	44
Non-Covered Loans | Construction and land development
Balance December 31, 2015
Individually evaluated for impairment	369	352
Collectively evaluated for impairment	1,335	1,363
Total	1,704	1,715	2,136	5,239
Loans - Ending Balance:
Individually evaluated for impairment	2,800	6,866
Collectively evaluated for impairment	158,261	137,012
Total	161,061	143,878
Provision for Loan, Lease, and Other Losses	(335)	(322)	(2,695)
Financing Receivable, Allowance for Credit Losses, Write-downs	350	905	896
Financing Receivable, Allowance for Credit Losses, Recovery	674	806	488
Non-Covered Loans | Residential real estate
Balance December 31, 2015
Individually evaluated for impairment	7	1,052
Collectively evaluated for impairment	1,789	1,778
Total	1,796	2,830	2,019	2,026
Loans - Ending Balance:
Individually evaluated for impairment	681	3,082
Collectively evaluated for impairment	195,817	182,170
Total	196,498	185,252
Provision for Loan, Lease, and Other Losses	(58)	525	107
Financing Receivable, Allowance for Credit Losses, Write-downs	1,313	48	1,053
Financing Receivable, Allowance for Credit Losses, Recovery	337	334	939
Non-Covered Loans | Consumer and other
Balance December 31, 2015
Individually evaluated for impairment	0	286
Collectively evaluated for impairment	1,432	854
Total	1,432	1,140	192	31
Loans - Ending Balance:
Individually evaluated for impairment	0	766
Collectively evaluated for impairment	137,828	98,779
Total	137,537	98,650
Portfolio loans, including unearned loan fees	137,828	99,545
Provision for Loan, Lease, and Other Losses	218	1,079	195
Financing Receivable, Allowance for Credit Losses, Write-downs	27	165	34
Financing Receivable, Allowance for Credit Losses, Recovery	101	34	0
Non-Covered Loans | Unallocated
Balance December 31, 2015
Total	0	0	0	$ 2,375
Loans - Ending Balance:
Provision for Loan, Lease, and Other Losses	0	0	(2,375)
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	$ 0	$ 0	$ 0

Portfolio Loans - Summary of 63

Portfolio Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - Non-Covered Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 11,864	$ 25,497
Recorded Investment With No Allowance	5,072	6,741
Recorded Investment With Allowance	4,915	16,249
Total Recorded Investment	9,987	22,990
Related Allowance	2,335	2,394
Average Recorded Investment	11,924	18,607
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	5,554	8,042
Recorded Investment With No Allowance	509	2,609
Recorded Investment With Allowance	4,204	3,464
Total Recorded Investment	4,713	6,073
Related Allowance	1,953	704
Average Recorded Investment	6,970	4,136
Commercial - Owner Occupied
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	329	610
Recorded Investment With No Allowance	85	0
Recorded Investment With Allowance	113	519
Total Recorded Investment	198	519
Related Allowance	6	0
Average Recorded Investment	301	1,281
Commercial - Investor Owned
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	927	5,036
Recorded Investment With No Allowance	927	0
Recorded Investment With Allowance	0	5,187
Total Recorded Investment	927	5,187
Related Allowance	0	0
Average Recorded Investment	970	4,375
Construction and land development
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	4,349	7,961
Recorded Investment With No Allowance	2,914	419
Recorded Investment With Allowance	530	6,929
Total Recorded Investment	3,444	7,348
Related Allowance	369	352
Average Recorded Investment	3,001	7,280
Residential real estate
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	705	3,082
Recorded Investment With No Allowance	637	2,943
Recorded Investment With Allowance	68	150
Total Recorded Investment	705	3,093
Related Allowance	7	1,052
Average Recorded Investment	682	954
Consumer and other
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	766
Recorded Investment With No Allowance	0	770
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	770
Related Allowance	0	286
Average Recorded Investment	$ 0	$ 581

Portfolio Loans - Summary of Pa

Portfolio Loans - Summary of Past Due and Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Total interest income that would have been recognized under original terms on impaired loans	$ 1,038	$ 1,013	$ 1,538
Total cash received and recognized as interest income on impaired loans	226	118	257
Total interest income recognized on impaired loans still accruing	$ 36	$ 39	$ 16

Portfolio Loans - Narrative (De

Portfolio Loans - Narrative (Details) $ in Millions	Dec. 31, 2015USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans over 90 days past due and still accruing interest | loan	0
Unadvanced commitments on impaired loans	$ 0
Specific reserves on restructured loans	0.2
Unadvanced Commitment on Impaired Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans	$ 0.3

Portfolio Loans - Summary of 66

Portfolio Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) - Non-Covered Loans - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 9,680	$ 21,630
Restructured	307	1,360
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	9,987	22,990
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	4,406	6,073
Restructured	307	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	4,713	6,073
Commercial - Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	927	4,597
Restructured	0	590
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	927	5,187
Commercial - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	198	519
Restructured	0	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	198	519
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	3,444	7,348
Restructured	0	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	3,444	7,348
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	705	3,093
Restructured	0	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	705	3,093
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Restructured	0	770
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	$ 0	$ 770

Portfolio Loans - Summary of 67

Portfolio Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) - Non-Covered Loans $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)loan	Dec. 31, 2014USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	8
Pre-Modification Outstanding Recorded Balance	$ 303	$ 5,862
Post-Modification Outstanding Recorded Balance	$ 303	$ 5,612
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	2
Pre-Modification Outstanding Recorded Balance	$ 303	$ 658
Post-Modification Outstanding Recorded Balance	$ 303	$ 658
CRE - investor owned
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	2
Pre-Modification Outstanding Recorded Balance	$ 0	$ 606
Post-Modification Outstanding Recorded Balance	$ 0	$ 606
CRE - owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Balance	$ 0	$ 603
Post-Modification Outstanding Recorded Balance	$ 0	$ 603
Construction and land development
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Balance	$ 0	$ 2,827
Post-Modification Outstanding Recorded Balance	$ 0	$ 2,827
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Balance	$ 0	$ 125
Post-Modification Outstanding Recorded Balance	$ 0	$ 125
Consumer and other
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Balance	$ 0	$ 1,043
Post-Modification Outstanding Recorded Balance	$ 0	$ 793

Portfolio Loans - Summary of 68

Portfolio Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured and Subsequently Defaulted (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)loan	Dec. 31, 2014USD ($)loan
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Number of Loans | loan	0	1
Recorded Balance | $	$ 0	$ 241
Commercial and industrial
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Number of Loans | loan	0	0
Recorded Balance | $	$ 0	$ 0
CRE - investor owned
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Number of Loans | loan	0	0
Recorded Balance | $	$ 0	$ 0
CRE - owner occupied
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Number of Loans | loan	0	0
Recorded Balance | $	$ 0	$ 0
Construction and land development
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Number of Loans | loan	0	1
Recorded Balance | $	$ 0	$ 241
Residential
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Number of Loans | loan	0	0
Recorded Balance | $	$ 0	$ 0
Consumer and other
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Number of Loans | loan	0	0
Recorded Balance | $	$ 0	$ 0

Portfolio Loans - Summary of Ag

Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Portfolio loans, including unearned loan fees	$ 2,750,737	$ 2,433,916
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,537	4,964
Financing Receivable, Recorded Investment, 90 Days Past Due	4,026	7,702
Total Past Due	5,563	12,666
Current	2,745,174	2,421,250
Total	2,750,446	2,433,021
Portfolio loans, including unearned loan fees	2,750,737	2,433,916
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	505	3,059
Financing Receivable, Recorded Investment, 90 Days Past Due	888	232
Total Past Due	1,393	3,291
Current	1,482,934	1,261,196
Total	1,484,327	1,264,487
Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	94	0
Financing Receivable, Recorded Investment, 90 Days Past Due	184	496
Total Past Due	278	496
Current	342,681	343,507
Total	342,959	344,003
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	464	261
Financing Receivable, Recorded Investment, 90 Days Past Due	0	4,450
Total Past Due	464	4,711
Current	427,600	392,040
Total	428,064	396,751
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	384	702
Financing Receivable, Recorded Investment, 90 Days Past Due	2,273	2,524
Total Past Due	2,657	3,226
Current	158,404	140,652
Total	161,061	143,878
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	70	168
Financing Receivable, Recorded Investment, 90 Days Past Due	681	0
Total Past Due	751	168
Current	195,747	185,084
Total	196,498	185,252
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	20	774
Financing Receivable, Recorded Investment, 90 Days Past Due	0	0
Total Past Due	20	774
Current	137,808	98,771
Total	137,537	98,650
Portfolio loans, including unearned loan fees	$ 137,828	$ 99,545

Portfolio Loans - Summary of 70

Portfolio Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	$ 2,750,737	$ 2,433,916
Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	2,750,446	2,433,021
Portfolio loans, including unearned loan fees	2,750,737	2,433,916
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	1,484,327	1,264,487
Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	342,959	344,003
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	428,064	396,751
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	161,061	143,878
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	196,498	185,252
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	137,537	98,650
Portfolio loans, including unearned loan fees	137,828	99,545
Pass (1-6) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	2,541,405	2,229,430
Pass (1-6) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	1,356,864	1,161,979
Pass (1-6) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	314,791	322,725
Pass (1-6) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	403,820	361,991
Pass (1-6) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	146,601	122,365
Pass (1-6) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	188,269	168,543
Pass (1-6) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	131,060	91,827
Watch (7) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	149,938	128,484
Watch (7) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	90,370	62,315
Watch (7) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	24,727	18,025
Watch (7) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	18,868	18,640
Watch (7) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	10,114	12,993
Watch (7) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	5,138	11,012
Watch (7) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	721	5,499
Substandard (8) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	59,394	76,002
Substandard (8) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	37,093	40,193
Substandard (8) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	3,441	3,253
Substandard (8) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	5,376	16,120
Substandard (8) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	4,346	8,520
Substandard (8) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	3,091	5,697
Substandard (8) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	6,047	2,219
Doubtful (9) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	0	0
Doubtful (9) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	0	0
Doubtful (9) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	0	0
Doubtful (9) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	0	0
Doubtful (9) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	0	0
Doubtful (9) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	0	0
Doubtful (9) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan fees	$ 0	$ 0

Purchase Credit Impaired ("PC71

Purchase Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands	Dec. 31, 2015USD ($)rating	Dec. 31, 2014USD ($)rating
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 74,758	$ 99,103
Construction and land development
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.28	6.16
Recorded Investment PCI Loans	$ 6,838	$ 7,740
CRE - owner occupied
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.98	7.07
Recorded Investment PCI Loans	$ 25,272	$ 39,066
CRE - investor owned
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.30	6.35
Recorded Investment PCI Loans	$ 19,414	$ 22,695
Residential real estate
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.44	5.54
Recorded Investment PCI Loans	$ 19,287	$ 25,121
Total real estate loans
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 70,811	$ 94,622
Commercial and industrial
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.70	6.57
Recorded Investment PCI Loans	$ 3,863	$ 4,012
Consumer and other
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	1.89	5.39
Recorded Investment PCI Loans	$ 84	$ 469

Purchase Credit Impaired ("PC72

Purchase Credit Impaired ("PCI") Loans - Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category (Details) - Covered Loans - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 4,671	$ 3,672
90 or More Days Past Due	3,791	10,722
Total Past Due	8,462	14,394
Current	66,296	84,709
Total	74,758	99,103
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	0	16
Total Past Due	0	16
Current	3,863	3,996
Total	3,863	4,012
CRE - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	731	0
90 or More Days Past Due	0	2,759
Total Past Due	731	2,759
Current	18,683	19,936
Total	19,414	22,695
CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,342	878
90 or More Days Past Due	3,661	6,484
Total Past Due	6,003	7,362
Current	19,269	31,704
Total	25,272	39,066
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	774
90 or More Days Past Due	0	0
Total Past Due	0	774
Current	6,838	6,966
Total	6,838	7,740
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,594	2,020
90 or More Days Past Due	130	1,451
Total Past Due	1,724	3,471
Current	17,563	21,650
Total	19,287	25,121
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4	0
90 or More Days Past Due	0	12
Total Past Due	4	12
Current	80	457
Total	$ 84	$ 469

Purchase Credit Impaired ("PC73

Purchase Credit Impaired ("PCI") Loans - Rollforward of PCI Loans, Net of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 83,693	$ 125,100
Principal reductions and interest payments	(24,441)	(35,718)
Accretion of loan discount	10,775	15,747
Changes in contractual and expected cash flows due to remeasurement	14,707	8,467
Reductions due to disposals	(20,151)	(29,903)
Balance at end of period	64,583	83,693
Contractual Cashflows
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	178,145	266,068
Principal reductions and interest payments	(24,441)	(35,718)
Accretion of loan discount	0	0
Changes in contractual and expected cash flows due to remeasurement	(3,574)	(2,170)
Reductions due to disposals	(33,441)	(50,035)
Balance at end of period	116,689	178,145
Non-accretable Difference
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	65,719	87,438
Principal reductions and interest payments	0	0
Accretion of loan discount	0	0
Changes in contractual and expected cash flows due to remeasurement	(30,413)	(7,403)
Reductions due to disposals	(8,541)	(14,316)
Balance at end of period	26,765	65,719
Accretable Yield
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	28,733	53,530
Principal reductions and interest payments	0	0
Accretion of loan discount	10,775	15,747
Changes in contractual and expected cash flows due to remeasurement	12,132	(3,234)
Reductions due to disposals	(4,749)	(5,816)
Balance at end of period	$ 25,341	$ 28,733

Purchase Credit Impaired ("PC74

Purchase Credit Impaired ("PCI") Loans - Summary of FDIC Loss Share Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Total Cash received from FDIC for covered assets	$ 3,528
Reductions for loss share termination	(5,922)	$ 0
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period	15,866	34,319
Cash received from the FDIC for covered assets	(2,275)	(9,605)	$ (10,981)
FDIC reimbursable losses (recoveries)	(1,386)	459
Amortization, net	(2,293)	(6,342)
Loan impairment (impairment reversal)	(1,113)	841
Reductions for payments on covered assets in excess of expected cash flows	(1,624)	(3,806)
Balance at end of period	$ 0	$ 15,866	$ 34,319

Purchase Credit Impaired ("PC75

Purchase Credit Impaired ("PCI") Loans - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
FDIC proceeds from loss share termination [Line Items]
Removal of remaining clawback liability, FDIC loss share termination	$ 3,500
Removal of remaining FDIC receivable, FDIC loss share termination	7,200
One-time pretax charge	2,400
PCI loans outstanding	98,600	$ 135,300
Net payment received from FDIC for loss share termination	1,300
Expense recorded related to Clawback Liability	$ 760	$ 1,201	$ 951

Derivative Financial Instrume76

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Pledged cash as collateral in connection with interest rate swap agreements	$ 1,300	$ 1,000
Non-designated hedging instruments | Risk Management | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Notional Amount	3,500	23,800
Non-designated hedging instruments | Risk Management | Other Assets | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	2
Non-designated hedging instruments | Risk Management | Other Liabilities | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Liability derivatives (other liabilities), fair value	0	0
Non-designated hedging instruments | Client-Related | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Notional Amount	153,630	141,263
Non-designated hedging instruments | Client-Related | Other Assets | Interest rate swap contracts
Derivative [Line Items]
Counterparty credit exposure on derivatives	1,155
Summary of Derivative Instruments [Abstract]
Derivative Asset, Fair Value, Gross Asset		907
Non-designated hedging instruments | Client-Related | Other Liabilities | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Liability derivatives (other liabilities), fair value	$ 1,155	$ 907

Fixed Assets - Summary of Fixed

Fixed Assets - Summary of Fixed Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Land	$ 3,103	$ 3,103
Buildings and leasehold improvements	17,837	17,170
Furniture, fixtures and equipment	4,892	3,750
Capitalized software	1,030	735
Fixed assets, gross	26,862	24,758
Less accumulated depreciation and amortization	12,020	10,005
Fixed assets, net	$ 14,842	$ 14,753

Fixed Assets - Narrative (Detai

Fixed Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Depreciation and amortization	$ 2	$ 2.2	$ 2.8
Rent expense	3.1	2.9	3
Sublease rental income	$ 0.1	$ 0.2	$ 0.2

Fixed Assets - Future Aggregate

Fixed Assets - Future Aggregate Minimum Rental Commitments (Details) $ in Thousands	Dec. 31, 2015USD ($)
Future Aggregate Minimum Rental Commitments
2,015	$ 3,019
2,016	2,656
2,017	2,395
2,018	2,388
2,019	2,348
Thereafter	8,362
Total	$ 21,168

Goodwill and Intangible Asset80

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 30,334	$ 30,334
Finite-lived intangible assets useful life	10 years	10 years
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 1,089	$ 1,254	$ 1,905
Core deposit intangible, net, end of year	$ 3,075
Core Deposits [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived intangible assets useful life	10 years
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 1,089	1,254	$ 1,635
Gross core deposit intangible balance, beginning of year	9,060	9,060
Accumulated amortization	(5,985)	(4,896)
Core deposit intangible, net, end of year	$ 3,075	$ 4,164

Goodwill and Intangible Asset81

Goodwill and Intangible Assets - Expected Amortization Schedule for the Core Deposit Intangible (Details) $ in Thousands	Dec. 31, 2015USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,015	$ 924
2,016	760
2,017	595
2,018	430
2,019	265
After 2,020	101
Core deposit intangible, net, end of year	$ 3,075

Maturity of Certificates of D82

Maturity of Certificates of Deposit (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
$100,000 and Over
Less than 1 year	$ 169,936
Greater than 1 year and less than 2 years	13,993
Greater than 2 years and less than 3 years	48,619
Greater than 3 years and less than 4 years	20,942
Greater than 4 years and less than 5 years	3,270
Greater than 5 years	0
Time Deposits, $100,000 or More	256,760	$ 377,544
Other
Less than 1 year	61,195
Greater than 2 years and less than 3 years	14,844
Greater than 2 years and less than 3 years	13,510
Greater than 3 years and less than 4 years	7,367
Greater than 3 years and less than 4 years	2,503
Greater than 5 years	9
Time Deposits, Less than $100,000	99,428	$ 127,808
Total
Less than 1 year	231,131
Greater than 1 year and less than 2 years	28,837
Greater than 2 years and less than 3 years	62,129
Greater than 3 years and less than 4 years	28,309
Greater than 4 years and less than 5 years	5,773
Greater than 5 years	9
Total Time Deposits	$ 356,188

Subordinated Debentures (Detail

Subordinated Debentures (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 14, 2014	Aug. 15, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 56,807	$ 56,807
Subordinated debentures held by trusts			$ 1,700
Conversion of subordinated debt into common stock (in shares)	287,852	1,200,000	0	287,852	1,176,470
Additional stock issued as an inducement (in shares)		25,060
Expense related to inducement					$ 400
EFSC Capital Trust VIII
Subordinated Borrowing [Line Items]
Trust preferred subordinated debentures	$ 5,000	$ 20,000
Conversion price (usd per share)	$ 17.37
Trust preferred securities [Member] | EFSC Clayco Statutory Trust I
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 3,196	$ 3,196
Maturity Date			Dec. 17, 2033
Call Date			Dec. 17, 2008
Description of variable rate			3 Month LIBOR
Floating interest rate			2.85%
Trust preferred securities [Member] | EFSC Capital Trust II
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 5,155	5,155
Maturity Date			Jun. 17, 2034
Call Date			Jun. 17, 2009
Description of variable rate			3 Month LIBOR
Floating interest rate			2.65%
Trust preferred securities [Member] | EFSC Statutory Trust III
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 11,341	11,341
Maturity Date			Dec. 15, 2034
Call Date			Dec. 15, 2009
Description of variable rate			3 Month LIBOR
Floating interest rate			1.97%
Trust preferred securities [Member] | EFSC Clayco Statutory Trust II
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 4,124	4,124
Maturity Date			Sep. 15, 2035
Call Date			Sep. 15, 2010
Description of variable rate			3 Month LIBOR
Floating interest rate			1.83%
Trust preferred securities [Member] | EFSC Statutory Trust IV
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 10,310	10,310
Maturity Date			Dec. 15, 2035
Call Date			Dec. 15, 2010
Description of variable rate			3 Month LIBOR
Floating interest rate			1.44%
Trust preferred securities [Member] | EFSC Statutory Trust V
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 4,124	4,124
Maturity Date			Sep. 15, 2036
Call Date			Sep. 15, 2011
Description of variable rate			3 Month LIBOR
Floating interest rate			1.60%
Trust preferred securities [Member] | EFSC Capital Trust VI
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 14,433	14,433
Maturity Date			Mar. 30, 2037
Call Date			Mar. 30, 2012
Description of variable rate			3 Month LIBOR
Floating interest rate			1.60%
Trust preferred securities [Member] | EFSC Capital Trust VII
Subordinated Borrowing [Line Items]
Subordinated debentures			$ 4,124	$ 4,124
Maturity Date			Dec. 15, 2037
Call Date			Dec. 15, 2012
Description of variable rate			3 Month LIBOR
Floating interest rate			2.25%
Trust preferred securities [Member] | EFSC Capital Trust VIII
Subordinated Borrowing [Line Items]
Fixed interest rate			9.00%

Federal Home Loan Bank Advanc84

Federal Home Loan Bank Advances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances, Branch of FHLB [Line Items]
Carrying value of the loans pledged	$ 110,000	$ 144,000
Prepayment of FHLB advances	$ 50,000	$ 30,000
Weighted average interest rate	3.17%	4.09%
Maturity (in years)	3 years	3 years
Prepayment penalty	$ 2,900	$ 2,600
Short term advances outstanding	$ 110,000	$ 144,000
Weighted average interest rate on short term advances	0.00%	0.00%
Collateral used to secure confirming letters of credit	$ 11,400
Weighted Rate
Federal Home Loan Bank, Advances, Maturities Summary, One to Five Years	$ 0	$ 0
Federal Home Loan Bank Advances, Maturities Summary, Average Interest Rate of Amounts Due in One to Five Years of Balance Sheet Date	0.00%	0.00%
Federal Home Loan Bank, Advances, Maturities Summary, Average Interst Rate of Amounts	0.00%	0.00%
Des Moines
Federal Home Loan Bank, Advances, Branch of FHLB [Line Items]
Carrying value of the loans pledged	$ 633,500	$ 649,700
Availability under the secured line of credit	239,600
Investment in capital stock	$ 8,300

Other Borrowings and Notes Pa85

Other Borrowings and Notes Payable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Nov. 06, 2012
Debt Instrument [Line Items]
Securities sold under repurchase agreements	$ 270,326,000	$ 230,373,000
Secured borrowings	0	3,810,000
Total	270,326,000	234,183,000
Line of Credit
Debt Instrument [Line Items]
Remaining borrowing capacity	815,600,000
Aggregate of pledge secured by certain eligible loans	1,054,000,000
Amount withdrawn	0
Other Borrowings
Debt Instrument [Line Items]
Average balance during the year	195,328,000	184,964,000
Maximum balance outstanding at any month-end	$ 270,326,000	$ 234,183,000
Average interest rate during the year	0.22%	0.32%
Average interest rate at December 31	0.16%	0.30%
Unsecured Term Loan
Debt Instrument [Line Items]
Average balance during the year	$ 4,509,000	$ 6,464,000
Maximum balance outstanding at any month-end	$ 5,700,000	$ 6,900,000
Average interest rate during the year	3.01%	2.99%
Average interest rate at December 31	0.00%	2.94%
Unsecured term loan, face amount			$ 12,000,000
Term Loan	$ 0	$ 5,700,000

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Enterprise Financial Services Corp [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual, Amount	$ 418,367	$ 369,868
Actual, Ratio	11.85%	13.40%
For Capital Adequacy Purposes, Amount	$ 282,442	$ 220,858
For Capital Adequacy Purposes, Ratio	8.00%	8.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount	$ 0	$ 0
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.00%	0.00%
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual, Amount	$ 374,676	$ 335,221
Actual, Ratio	10.61%	12.14%
For Capital Adequacy Purposes, Amount	$ 211,831	$ 110,429
For Capital Adequacy Purposes, Ratio	6.00%	4.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount	$ 0	$ 0
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.00%	0.00%
Tier One Common Equity Capital	$ 319,553
Tier One Common Equity Capital to Risk Weighted Assets	9.05%
Tier One Common Equity Capital Required for Capital Adequacy	$ 158,873
Tier One Common Equity Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%
Tier One Common Equity Capital Required to be Well Capitalized	$ 0
Tier One Common Equity Capital Required to be Well Capitalized to Risk Weighted Assets	0.00%
Tier 1 Capital (to Average Assets) [Abstract]
Actual, Amount	$ 374,676	$ 335,221
Actual, Ratio	10.71%	10.48%
For Capital Adequacy Purposes, Amount	$ 139,893	$ 96,000
For Capital Adequacy Purposes, Ratio	4.00%	3.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount	$ 0	$ 0
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.00%	0.00%
Enterprise Bank and Trust [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual, Amount	$ 386,531	$ 343,334
Actual, Ratio	10.98%	12.51%
For Capital Adequacy Purposes, Amount	$ 281,632	$ 219,645
For Capital Adequacy Purposes, Ratio	8.00%	8.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount	$ 352,040	$ 274,556
To Be Well Capitalized Under Applicable Action Provisions, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual, Amount	$ 342,840	$ 308,874
Actual, Ratio	9.74%	11.25%
For Capital Adequacy Purposes, Amount	$ 211,224	$ 109,823
For Capital Adequacy Purposes, Ratio	6.00%	4.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount	$ 281,632	$ 164,734
To Be Well Capitalized Under Applicable Action Provisions, Ratio	8.00%	6.00%
Tier One Common Equity Capital	$ 342,816
Tier One Common Equity Capital to Risk Weighted Assets	9.74%
Tier One Common Equity Capital Required for Capital Adequacy	$ 158,418
Tier One Common Equity Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%
Tier One Common Equity Capital Required to be Well Capitalized	$ 228,826
Tier One Common Equity Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%
Tier 1 Capital (to Average Assets) [Abstract]
Actual, Amount	$ 342,840	$ 308,874
Actual, Ratio	9.84%	9.71%
For Capital Adequacy Purposes, Amount	$ 139,311	$ 95,411
For Capital Adequacy Purposes, Ratio	4.00%	3.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount	$ 174,138	$ 159,018
To Be Well Capitalized Under Applicable Action Provisions, Ratio	5.00%	5.00%

Compensation Plans - Narrative

Compensation Plans - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2016	Feb. 28, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant			415,104
Share-based compensation expense			$ 3,600	$ 2,900	$ 5,000
Tax benefit (expense) from compensation expense			$ 400	$ 200	200
Award vesting period				3 years
Number of shares issued upon completion of performance cycle		122,470		146,700
Employee minimum age to participate in plan			21 years
Company contributions, amount charged to expense			$ 1,600	$ 1,400	1,200
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term			10 years
Stock Appreciation Rights (SSARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Contractual term			10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 725	945	1,142
Total unrecognized compensation cost (less than)			$ 942	1,462	2,168
Number of shares issued			6,088
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 200	$ 100	$ 600
Number of shares issued			14,110	34,034	37,943
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 2,700	$ 1,800	$ 3,200
Award vesting period				3 years
Minimum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Minimum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Minimum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			2 years
Maximum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Maximum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Stock Plan for Non-Management Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant			42,222
Share-based compensation expense			$ 373	$ 329	$ 262
Number of shares authorized			200,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued upon completion of performance cycle	159,094

Compensation Plans - Schedule o

Compensation Plans - Schedule of Various Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 3,600	$ 2,900	$ 5,000
Weighted average fair value (usd per share)	$ 19,210	$ 16,840
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 725	$ 945	1,142
Total fair value at vesting date	809	913	828
Total unrecognized compensation cost for nonvested stock units	$ 942	$ 1,462	$ 2,168
Expected years to recognize unearned compensation	1 year 8 months	2 years 8 months 12 days	3 years 7 months 6 days
Stock Options and SSARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 50	$ 103	$ 213
Intrinsic value of option exercises on date of exercise	74	226	300
Cash received from the exercise of stock options	126	149	2,040
Stock Plan for Non-Management Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 373	$ 329	$ 262
Number of shares issued	16,283,000	23,135,000	16,990,000
Weighted average fair value (usd per share)	$ 24.43	$ 19.20	$ 15.40

Compensation Plans - Schedule89

Compensation Plans - Schedule of Employee Stock Options and SSARs Activity (Details) - Stock Options and SSARs	12 Months Ended
	Dec. 31, 2015USD ($)$ / sharesshares
Shares
Outstanding at beginning of period (in shares) | shares	401,581
Granted (in shares) | shares	0
Exercised (in shares) | shares	(13,478)
Forfeited (in shares) | shares	0
Outstanding at end of period (in shares) | shares	388,103
Exercisable (in shares) | shares	388,103
Weighted Average Exercise Price
Outstanding at beginning of period (usd per share) | $ / shares	$ 19.24
Granted (usd per share) | $ / shares	0
Exercised (usd per share) | $ / shares	21.54
Forfeited (usd per share) | $ / shares	0
Outstanding at end of period (usd per share) | $ / shares	19.15
Exercisable (usd per share) | $ / shares	$ 19.15
Additional Disclosures
Outstanding, weighted average remaining contractual term	2 years 9 months
Exercisable, weighted average remaining contractual term	2 years 9 months
Outstanding, aggregate intrinsic value | $	$ 3,569
Exercisable, aggregate intrinsic value | $	$ 3,569

Compensation Plans - Summary of

Compensation Plans - Summary of Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Shares
Outstanding, beginning of period (in shares) | shares	139,849
Granted (in shares) | shares	6,088
Vested (in shares) | shares	(58,679)
Forfeited (in shares) | shares	(904)
Outstanding, end of period (in shares) | shares	86,354
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (usd per share) | $ / shares	$ 13.81
Granted (usd per share) | $ / shares	20.69
Vested (usd per share) | $ / shares	13.79
Forfeited (usd per share) | $ / shares	13.33
Outstanding, end of period (usd per share) | $ / shares	$ 14.31

Compensation Plans Outstanding

Compensation Plans Outstanding Longer Term Incentive Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Outstanding Long Term Incentive Awards [Line Items]
Target Shares Issuable as Long Term Incentive Awards	$ 126,000	$ 107,642
Maximum Shares Issuable as Long Term Incentive Awards	157,250	141,577
Unrecognized Compensation Cost - Long Term Incentives	$ 1,454,417	$ 745,873
Share-based Compensation Arrangement By Share-based Payment Award, Grants In Period, Weighted Average Grant Date Fair Value	$ 19,210	$ 16,840

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Examination [Line Items]
Federal									$ 22,916	$ 9,399	$ 24,029
State and local									2,798	195	2,890
Current Federal, State and Local, Tax Expense (Benefit)									25,714	9,594	26,919
Deferred:									(5,763)	4,277	(9,943)
Deferred Federal Income Tax Expense (Benefit)									(5,266)	3,908	(9,393)
Deferred State and Local Income Tax Expense (Benefit)									(497)	369	(550)
Deferred Federal, State and Local, Tax Expense (Benefit)									(5,763)	4,277	(9,943)
Total income tax expense	$ 5,445	$ 4,722	$ 4,762	$ 5,022	$ 2,812	$ 4,388	$ 3,664	$ 3,007	$ 19,951	$ 13,871	$ 16,976

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits that would impact effective tax rate	$ 900				$ 1,300				$ 900	$ 1,300	$ 800
Statutory federal income tax rate									35.00%	35.00%	35.00%
Increase (reduction) in income tax resulting from:
Income tax expense at statutory rate									$ 20,440	$ 14,365	$ 17,528
Tax-exempt income, net									(931)	(857)	(1,128)
State and local income taxes, net									1,414	741	1,314
Bank-owned life insurance, net									(462)	(535)	(484)
Non-deductible expenses									259	290	222
Change in estimated rate for deferred taxes									0	0	336
Tax benefits of LIHTC investments, net									(179)	(158)	(204)
Other, net									(590)	25	(608)
Total income tax expense	$ 5,445	$ 4,722	$ 4,762	$ 5,022	$ 2,812	$ 4,388	$ 3,664	$ 3,007	$ 19,951	$ 13,871	$ 16,976

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax [Line Items]
Net deferred tax asset	$ 38,495	$ 31,375
Deferred tax assets:
Allowance for loan losses	16,705	17,463
Basis difference on PCI assets, net	8,806	5,477
Basis difference on Other real estate	328	516
Deferred compensation	4,509	4,854
Goodwill and other intangible assets	6,973	9,001
Accrued compensation	2,222	2,364
Other, net	907	979
Total deferred tax assets	40,450	40,654
Deferred tax liabilities:
FDIC loss share receivable, net	0	5,542
Unrealized gains on securities available for sale	183	1,091
State tax credits held for sale, net of economic hedge	594	1,051
Core deposit intangibles	1,178	1,595
Total deferred tax liabilities	1,955	9,279
Net deferred tax asset	38,495	31,375
Other Assets
Deferred Tax [Line Items]
Net deferred tax asset	38,500	31,400
Deferred tax liabilities:
Net deferred tax asset	$ 38,500	$ 31,400

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details)	12 Months Ended
	Dec. 31, 2015USD ($)state	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Income Tax Examination [Line Items]
Tax credits and other tax benefits from low-income housing tax credit	$ 1,100,000	$ 1,100,000	$ 1,100,000
Amount recognized as a component of income tax expense related low-income housing tax credit	300,000	200,000	200,000
Investments related to low-income housing tax credits	2,300,000		3,200,000
Impairment losses recognized from forfeiture or ineligibility	0	0	0
Future capital commitments related to low-income housing tax credit investments	$ 300,000
Number of states the company files income tax returns in | state	9
Unrecognized tax benefits	$ 1,359,000	1,884,000	1,257,000	$ 1,148,000
Unrecognized tax benefits that would impact effective tax rate	900,000	1,300,000	$ 800,000
Reduction in unrecognized tax benefit that is reasonably possible due to a lapse of statute of limitations	$ 500,000
Duration of unrecognized tax benefits	12 months
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
State valuation allowance		$ 0

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 1,884	$ 1,257	$ 1,148
Additions based on tax positions related to the current year	230	401	233
Additions for tax positions of prior years	46	523	53
Reductions for tax positions of prior years	(437)	0	0
Settlements or lapse of statute of limitations	(364)	(297)	(177)
Balance at end of year	$ 1,359	$ 1,884	$ 1,257

Commitments (Details)

Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule of Commitments [Line Items]
Unadvanced commitments on impaired loans	$ 0
Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	1,140,028	$ 947,424
Standby letters of credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 54,648	50,108
Standby letters of credit | Maximum
Schedule of Commitments [Line Items]
Remaining term	2 years 3 months
Standby letters of credit | Minimum
Schedule of Commitments [Line Items]
Remaining term	1 month
Unadvanced Commitment on Impaired Loan
Schedule of Commitments [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans	$ 300
Unadvanced commitments on impaired loans		200
Fixed Rate Loan Commitment | Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 93,900	$ 65,900

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Assets
Securities available for sale	$ 451,770	$ 400,146
State tax credits held for sale	5,941	11,689
Portion at Other than Fair Value, Fair Value Disclosure
Assets
State tax credits held for sale	39,900
Total Fair Value
Assets
Securities available for sale	451,770	400,146
State tax credits held for sale	49,588	42,970
Derivative financial instruments	1,155	909
Liabilities
Derivative financial instruments	1,155	907
Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	99,008	91,826
Obligations of states and political subdivisions
Assets
Securities available for sale	41,701	34,881
Residential mortgage-backed securities
Assets
Securities available for sale	311,061	273,439
Recurring basis | Total Fair Value
Assets
Securities available for sale	451,770	400,146
State tax credits held for sale	5,941	11,689
Derivative financial instruments	1,155	909
Assets, Fair Value Disclosure	458,866	412,744
Liabilities
Derivative financial instruments	1,155	907
Total liabilities	1,155	907
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Total Fair Value
Assets
Securities available for sale	99,008	91,826
Recurring basis | Obligations of states and political subdivisions | Total Fair Value
Assets
Securities available for sale	41,701	34,881
Recurring basis | Residential mortgage-backed securities | Total Fair Value
Assets
Securities available for sale	311,061	273,439
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
State tax credits held for sale	0	0
Derivative financial instruments	0	0
Assets, Fair Value Disclosure	0	0
Liabilities
Derivative financial instruments	0	0
Total liabilities	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities
Assets
Securities available for sale	0	0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	448,693	397,087
State tax credits held for sale	0	0
Derivative financial instruments	1,155	909
Assets, Fair Value Disclosure	449,848	397,996
Liabilities
Derivative financial instruments	1,155	907
Total liabilities	1,155	907
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	99,008	91,826
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets
Securities available for sale	38,624	31,822
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Assets
Securities available for sale	311,061	273,439
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	3,077	3,059
State tax credits held for sale	5,941	11,689
Derivative financial instruments	0	0
Assets, Fair Value Disclosure	9,018	14,748
Liabilities
Derivative financial instruments	0	0
Total liabilities	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions
Assets
Securities available for sale	3,077	3,059
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Assets
Securities available for sale	0	0
State tax credits held for sale, at fair value | Recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 406	$ 558

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)security	Dec. 31, 2014USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits, held for sale, including $5,941 and $11,689 carried at fair value, respectively	$ 45,850	$ 38,309
State Tax Credits Held For Sale, Fair Value Disclosure	$ 5,941	11,689
State tax credit term	10 years
Years of tax credits generated	10 years
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits, held for sale, including $5,941 and $11,689 carried at fair value, respectively	$ 45,900
Recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	$ 5,941	11,689
Auction Rate Securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of available-for-sale securities | security	3
Portion at Other than Fair Value, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	$ 39,900
Estimated fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	49,588	42,970
Estimated fair value | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	5,941	11,689
State tax credits held for sale, at fair value | Recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in unrealized (losses) gains relating to assets still held at the reporting date	$ (1,212)	$ 868
Minimum | State tax credits held for sale, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	2.30%
Maximum | State tax credits held for sale, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	4.82%
LIBOR | LIBOR Swap Curve
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate basis point spread	2.05
Discount rate basis spread on variable rate	205.00%	205.00%
Lower range of basis spread on variable rate	265.00%
Higher range of basis spread on variable rate	285.00%
Prime Rate | State tax credits held for sale, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate basis spread on variable rate	75.00%

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 451,770	$ 400,146
Held-to-maturity Securities, Fair Value	43,441	45,795
Purchases, sales, issuances and settlements:
State Tax Credits Held For Sale, Fair Value Disclosure	5,941	11,689
Level 3 | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	3,077	3,059
Purchases, sales, issuances and settlements:
State Tax Credits Held For Sale, Fair Value Disclosure	5,941	11,689
Derivative financial instruments	0	0
Assets, Fair Value Disclosure	9,018	14,748
Derivative financial instruments	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Level 3 | Securities available for sale, at fair value | Recurring basis
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	3,059	3,040
Total gains:
Included in other comprehensive income	18	19
Purchases, sales, issuances and settlements:
Purchases	0	0
Transfer in and/or out of Level 3	0	0
Ending balance	3,077	3,059
Change in unrealized gains (losses) relating to assets still held at the reporting date	18	19
Level 3 | State tax credits held for sale, at fair value | Recurring basis
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	11,689	16,491
Total gains:
Total gains:	406	558
Purchases, sales, issuances and settlements:
Sales	(6,154)	(5,360)
Ending balance	5,941	11,689
Change in unrealized gains (losses) relating to assets still held at the reporting date	1,212	(868)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	0	0
Purchases, sales, issuances and settlements:
State Tax Credits Held For Sale, Fair Value Disclosure	0	0
Derivative financial instruments	0	0
Assets, Fair Value Disclosure	0	0
Derivative financial instruments	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	448,693	397,087
Purchases, sales, issuances and settlements:
State Tax Credits Held For Sale, Fair Value Disclosure	0	0
Derivative financial instruments	1,155	909
Assets, Fair Value Disclosure	449,848	397,996
Derivative financial instruments	1,155	907
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,155	907
Total Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	451,770	400,146
Purchases, sales, issuances and settlements:
State Tax Credits Held For Sale, Fair Value Disclosure	49,588	42,970
Derivative financial instruments	1,155	909
Derivative financial instruments	1,155	907
Total Fair Value | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	451,770	400,146
Purchases, sales, issuances and settlements:
State Tax Credits Held For Sale, Fair Value Disclosure	5,941	11,689
Derivative financial instruments	1,155	909
Assets, Fair Value Disclosure	458,866	412,744
Derivative financial instruments	1,155	907
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,155	907
Obligations of U.S. Government-sponsored enterprises
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	99,008	91,826
Obligations of U.S. Government-sponsored enterprises | Level 3 | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	0	0
Obligations of U.S. Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	0	0
Obligations of U.S. Government-sponsored enterprises | Significant Other Observable Inputs (Level 2) | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	99,008	91,826
Obligations of U.S. Government-sponsored enterprises | Total Fair Value | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	99,008	91,826
Obligations of states and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	41,701	34,881
Obligations of states and political subdivisions | Level 3 | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	3,077	3,059
Obligations of states and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	0	0
Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2) | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	38,624	31,822
Obligations of states and political subdivisions | Total Fair Value | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	41,701	34,881
Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	311,061	273,439
Residential mortgage-backed securities | Level 3 | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	0	0
Residential mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	0	0
Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	311,061	273,439
Residential mortgage-backed securities | Total Fair Value | Recurring basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 311,061	$ 273,439

Fair Value Measurements - Su101

Fair Value Measurements - Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	$ (6,174)	$ (6,252)
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	(6,091)	(5,556)
Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	(83)	(696)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Significant Other Observable Inputs (Level 2) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Significant Other Observable Inputs (Level 2) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	3,314	10,514
Significant Unobservable Inputs (Level 3) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	2,561	6,726
Significant Unobservable Inputs (Level 3) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	753	3,788
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	3,314	10,514
Total Fair Value | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	2,561	6,726
Total Fair Value | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	$ 753	$ 3,788

Fair Value Measurements - Su102

Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance sheet assets
Securities available for sale	$ 451,770	$ 400,146
Securities held to maturity	43,714	45,985
State tax credits held for sale	5,941	11,689
Carrying Amount
Balance sheet assets
Cash and due from banks	47,935	42,903
Federal funds sold	91	35
Interest-bearing deposits	47,131	63,058
Securities available for sale	451,770	400,146
Securities held to maturity	43,714	45,985
Other investments, at cost	17,455	17,037
Loans held for sale	6,598	4,033
Derivative financial instruments	1,155	909
Portfolio loans, net	2,781,879	2,487,424
State tax credits held for sale	45,850	38,309
Accrued interest receivable	8,399	7,956
Balance sheet liabilities
Deposits	2,784,591	2,491,510
Subordinated debentures	56,807	56,807
Federal Home Loan Bank advances	110,000	144,000
Other borrowings	270,326	239,883
Derivative financial instruments	1,155	907
Accrued interest payable	629	843
Estimated fair value
Balance sheet assets
Cash and due from banks	47,935	42,903
Federal funds sold	91	35
Interest-bearing deposits	47,131	63,058
Securities available for sale	451,770	400,146
Securities held to maturity	43,441	45,795
Other investments, at cost	17,455	17,037
Loans held for sale	6,598	4,033
Derivative financial instruments	1,155	909
Portfolio loans, net	2,782,704	2,482,700
State tax credits held for sale	49,588	42,970
Accrued interest receivable	8,399	7,956
Balance sheet liabilities
Deposits	2,784,654	2,494,624
Subordinated debentures	35,432	34,124
Federal Home Loan Bank advances	109,994	144,000
Other borrowings	270,286	239,950
Derivative financial instruments	1,155	907
Accrued interest payable	$ 629	$ 843

Fair Value Measurements - Sc103

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Estimated fair value | Securities held to maturity
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	$ 43,441	$ 45,795
Estimated fair value | Portfolio loans, net
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	2,782,704	2,482,700
Estimated fair value | State tax credits, held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	43,647	31,281
Estimated fair value | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	2,784,654	2,494,624
Estimated fair value | Subordinated debentures
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	35,432	34,124
Estimated fair value | Federal Home Loan Bank advances
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	109,994	144,000
Estimated fair value | Other Borrowings
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	270,286	239,950
Level 1 | Securities held to maturity
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 1 | Portfolio loans, net
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 1 | State tax credits, held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 1 | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	2,428,403	1,986,158
Level 1 | Subordinated debentures
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 1 | Federal Home Loan Bank advances
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 1 | Other Borrowings
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 2 | Securities held to maturity
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	43,441	45,795
Level 2 | Portfolio loans, net
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 2 | State tax credits, held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 2 | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 2 | Subordinated debentures
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	35,432	34,124
Level 2 | Federal Home Loan Bank advances
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	109,994	144,000
Level 2 | Other Borrowings
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	270,286	239,950
Level 3 | Securities held to maturity
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 3 | Portfolio loans, net
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	2,782,704	2,482,700
Level 3 | State tax credits, held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	43,647	31,281
Level 3 | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	356,251	508,466
Level 3 | Subordinated debentures
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 3 | Federal Home Loan Bank advances
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 3 | Other Borrowings
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	$ 0	$ 0

Parent Company Only Condense104

Parent Company Only Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Cash	$ 94,157	$ 100,696	$ 210,569	$ 116,370
Total assets	3,608,483	3,277,003
Subordinated debentures	56,807	56,807
Notes payable	0	5,700
Shareholders' equity	350,829	316,241	279,705	235,745
Total liabilities and shareholders' equity	3,608,483	3,277,003
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	12,032	14,532	$ 15,969	$ 8,080
Other assets	20,357	19,223
Total assets	407,991	379,522
Subordinated debentures	56,807	56,807
Notes payable	0	5,700
Accounts payable and other liabilities	355	774
Shareholders' equity	350,829	316,241
Total liabilities and shareholders' equity	407,991	379,522
Enterprise Bank and Trust [Member] | Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Investments	374,092	344,995
Enterprise Financial CDE LLC [Member] | Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Investments	$ 1,510	$ 772

Parent Company Only Condense105

Parent Company Only Condensed Financial Statements - Condensed Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends from subsidiaries									$ 141	$ 273	$ 364
Interest expense-subordinated debentures									1,248	1,322	3,019
Interest expense-notes payable	$ 3,017	$ 3,174	$ 3,072	$ 3,106	$ 3,569	$ 3,592	$ 3,567	$ 3,658	12,369	14,386	18,137
Income tax benefit	(5,445)	(4,722)	(4,762)	(5,022)	(2,812)	(4,388)	(3,664)	(3,007)	(19,951)	(13,871)	(16,976)
Net income	$ 10,679	$ 9,709	$ 8,716	$ 9,346	$ 5,967	$ 8,198	$ 7,160	$ 5,848	38,450	27,173	33,104
Total comprehensive income									36,987	33,234	20,934
Parent [Member]
Dividends from subsidiaries									10,000	10,000	10,000
Other									249	225	256
Total income									10,249	10,225	10,256
Interest expense-subordinated debentures									1,248	1,322	2,884
Interest expense-notes payable									144	193	396
Other expenses									3,823	4,402	5,142
Total expenses									5,215	5,917	8,422
Income before taxes and equity in undistributed earnings of subsidiaries									5,034	4,308	1,834
Income tax benefit									2,118	2,305	3,394
Net income									7,152	6,613	5,228
Equity in undistributed earnings of subsidiaries									31,298	20,560	27,876
Total comprehensive income									$ 38,450	$ 27,173	$ 33,104

Parent Company Only Condense106

Parent Company Only Condensed Financial Statements - Consolidated Statements of Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Adjustments to reconcile net income to net cash provided by operating activities
Share-based compensation	$ 3,601	$ 2,950	$ 5,048
Excess tax benefit of share-based compensation	(449)	(205)	(222)
Net cash provided by operating activities	47,187	31,494	29,308
Cash flows from investing activities:
Net cash provided by (used in) investing activities	(337,250)	(212,826)	176,084
Cash flows from financing activities:
Repayments of notes payable	(5,700)	(4,800)	(1,200)
Cash dividends paid	(5,259)	(4,177)	(3,946)
Excess tax benefit of share-based compensation	449	205	222
Issuance of common stock	2	2	1
Common stock repurchased	0	0	(1,006)
Proceeds from the issuance of equity instruments, net	(1,192)	(681)	2,264
Net cash provided (used) by financing activities	283,524	71,459	(111,193)
Net increase (decrease) in cash and cash equivalents	(6,539)	(109,873)	94,199
Cash and cash equivalents, beginning of period	100,696	210,569	116,370
Cash and cash equivalents, end of period	94,157	100,696	210,569
Parent [Member]
Cash flows from operating activities:
Net income available to common shareholders	38,450	27,173	33,104
Adjustments to reconcile net income to net cash provided by operating activities
Share-based compensation	3,601	2,950	5,049
Net income of subsidiaries	(41,298)	(30,560)	(37,876)
Dividends from subsidiaries	10,000	10,000	10,000
Excess tax benefit of share-based compensation	(449)	(205)	(222)
Other, net	848	704	2,004
Net cash provided by operating activities	11,152	10,062	12,059
Cash flows from investing activities:
Purchases of other investments	(2,832)	(2,224)	(761)
Proceeds from distributions on other investments	880	176	243
Net cash provided by (used in) investing activities	(1,952)	(2,048)	(518)
Cash flows from financing activities:
Repayments of notes payable	(5,700)	(4,800)	(1,200)
Cash dividends paid	(5,259)	(4,177)	(3,947)
Excess tax benefit of share-based compensation	449	205	222
Issuance of common stock	2	2	13
Common stock repurchased	0	0	(1,006)
Proceeds from the issuance of equity instruments, net	(1,192)	(681)	2,266
Net cash provided (used) by financing activities	(11,700)	(9,451)	(3,652)
Net increase (decrease) in cash and cash equivalents	(2,500)	(1,437)	7,889
Cash and cash equivalents, beginning of period	14,532	15,969	8,080
Cash and cash equivalents, end of period	$ 12,032	$ 14,532	$ 15,969

Quarterly Condensed Financia107

Quarterly Condensed Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Interest income	$ 35,096	$ 33,180	$ 32,352	$ 32,151	$ 34,385	$ 31,036	$ 32,309	$ 34,024	$ 132,779	$ 131,754	$ 153,289
Interest expense	3,017	3,174	3,072	3,106	3,569	3,592	3,567	3,658	12,369	14,386	18,137
Net interest income	32,079	30,006	29,280	29,045	30,816	27,444	28,742	30,366	120,410	117,368	135,152
Provision for portfolio loan losses	543	599	2,150	1,580	1,968	66	1,348	1,027	4,872	4,409	(642)
Provision (provision reversal) for PCI loan losses	(917)	(227)	0	(3,270)	126	(1,877)	(470)	3,304	(4,414)	1,083	4,974
Net interest income after provision for loan losses	32,453	29,634	27,130	30,735	28,722	29,255	27,864	26,035	119,952	111,876	130,820
Noninterest income	6,557	4,729	5,806	3,583	4,852	4,452	3,405	3,922	20,675	16,631	9,899
Noninterest expense	22,886	19,932	19,458	19,950	24,795	21,121	20,445	21,102	82,226	87,463	90,639
Income before income tax expense	16,124	14,431	13,478	14,368	8,779	12,586	10,824	8,855	58,401	41,044	50,080
Income tax expense	5,445	4,722	4,762	5,022	2,812	4,388	3,664	3,007	19,951	13,871	16,976
Net income	$ 10,679	$ 9,709	$ 8,716	$ 9,346	$ 5,967	$ 8,198	$ 7,160	$ 5,848	$ 38,450	$ 27,173	$ 33,104
Earnings per common share:
Basic (usd per share)	$ 0.53	$ 0.49	$ 0.44	$ 0.47	$ 0.30	$ 0.41	$ 0.36	$ 0.30	$ 1.92	$ 1.38	$ 1.78
Diluted (usd per share)	$ 0.52	$ 0.48	$ 0.43	$ 0.46	$ 0.30	$ 0.41	$ 0.36	$ 0.30	$ 1.89	$ 1.35	$ 1.73