First NBC Bank Holding (FNBCQ) 10-Q 20 Oct 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Oct. 14, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Trading Symbol	FNBC
Entity Registrant Name	First NBC Bank Holding Co
Entity Central Index Key	1,496,631
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		19,230,911

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Noninterest-bearing	$ 34,573	$ 50,270
Interest-bearing	108,023	293,109
Federal funds sold	3,415	5,675
Cash and cash equivalents	146,011	349,054
Investment in short-term receivables	0	25,604
Investment securities available for sale, at fair value	301,279	285,826
Investment securities held to maturity (fair value of $85,442 and $82,800, respectively)	79,598	82,074
Mortgage loans held for sale	3,198	2,597
Loans, net of allowance for loan losses of $76,964 and $78,478, respectively	3,703,021	3,380,115
Bank premises and equipment, net	60,054	67,155
Accrued interest receivable	14,404	14,003
Goodwill and other intangible assets	18,032	18,251
Investment in real estate properties	77,976	80,666
Investment in tax credit entities, net	92,880	108,586
Cash surrender value of bank-owned life insurance	49,371	48,691
Other real estate	7,709	5,232
Deferred tax asset	252,691	205,287
Other assets	45,193	32,684
Total assets	4,851,417	4,705,825
Deposits:
Noninterest-bearing	381,553	368,421
Interest-bearing	3,550,471	3,475,421
Total deposits	3,932,024	3,843,842
Short-term borrowings	7,022	8,000
Repurchase agreements	85,757	79,251
Subordinated debentures	60,000	60,000
Long-term borrowings	295,130	279,042
Accrued interest payable	9,036	8,728
Other liabilities	57,332	46,211
Total liabilities	4,446,301	4,325,074
Shareholders’ equity:
Preferred stock Series D – no par value; 37,935 shares authorized, issued and outstanding at June 30, 2016 and December 31, 2015	37,935	37,935
Common stock- par value $1 per share; 100,000,000 shares authorized; 19,231,427 shares issued and outstanding at June 30, 2016 and 19,077,572 shares issued and outstanding at December 31, 2015	19,231	19,078
Additional paid-in capital	244,899	242,979
Accumulated earnings	128,220	102,142
Accumulated other comprehensive loss, net	(25,171)	(21,385)
Total shareholders’ equity	405,114	380,749
Noncontrolling interest	2	2
Total equity	405,116	380,751	[1]
Total liabilities and equity	$ 4,851,417	$ 4,705,825
[1]	Balances as of December 31, 2014 and December 31, 2015 are audited.

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Investment securities held to maturity	$ 85,442	$ 82,800
Allowance for loan losses	$ 76,964	$ 78,478
Preferred stock, share authorized	37,935	37,935
Preferred stock, share issued	37,935	37,935
Preferred stock, share outstanding	37,935	37,935
Common stock, par value per share (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	19,231,427	19,077,572
Common stock, shares outstanding	19,231,427	19,077,572

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest income:
Loans, including fees	$ 46,185	$ 35,947	$ 89,511	$ 70,441
Investment securities	1,992	2,215	3,904	4,318
Investment in short-term receivables	0	1,514	41	3,204
Short-term investments	269	94	579	158
Total interest income	48,446	39,770	94,035	78,121
Interest expense:
Deposits	12,727	10,662	25,281	20,906
Borrowings and securities sold under repurchase agreements	2,241	1,740	4,310	2,980
Total interest expense	14,968	12,402	29,591	23,886
Net interest income	33,478	27,368	64,444	54,235
(Recovery of) provision for loan losses	(6,365)	5,600	8,383	8,600
Net interest income after provision for loan losses	39,843	21,768	56,061	45,635
Noninterest income:
Service charges on deposit accounts	477	585	1,074	1,144
Investment securities loss, net	0	0	0	(50)
Gain (loss) on assets sold, net	468	(32)	1,051	11
Gain on sale of loans, net	31	101	34	116
Cash surrender value income on bank-owned life insurance	338	353	680	705
Sale of state tax credits earned	0	668	0	1,187
Community Development Entity fees earned	149	133	184	256
ATM fee income	603	523	1,174	1,024
Rental property income	914	875	1,811	1,745
Other	638	412	2,333	832
Total non-interest income	3,618	3,618	8,341	6,970
Noninterest expense:
Salaries and employee benefits	9,896	7,689	17,526	14,596
Occupancy and equipment expenses	3,844	2,996	7,333	5,910
Professional fees	3,914	1,701	7,431	3,842
Taxes, licenses and FDIC assessments	3,760	1,693	5,497	2,932
Impairment of investment in tax credit entities	14,716	11,661	29,431	25,008
Write-down of foreclosed assets	189	42	232	100
Data processing	1,848	1,581	3,710	3,003
Advertising and marketing	1,002	673	1,941	1,691
Rental property expenses	1,422	965	2,938	1,931
Other	2,963	2,276	5,535	4,215
Total non-interest expense	43,554	31,277	81,574	63,228
Income (loss) before income taxes	(93)	(5,891)	(17,172)	(10,623)
Income tax benefit	(4,050)	(18,596)	(43,920)	(33,280)
Net income attributable to Company	3,957	12,705	26,748	22,657
Less preferred stock dividends	(575)	(95)	(670)	(190)
Less earnings allocated to participating securities	0	(222)	0	(413)
Income available to common shareholders	$ 3,382	$ 12,388	$ 26,078	$ 22,054
Earnings per common share – basic (in usd per share)	$ 0.18	$ 0.67	$ 1.37	$ 1.19
Earnings per common share - diluted (in usd per share)	$ 0.18	$ 0.65	$ 1.34	$ 1.15

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,957	$ 12,705	$ 26,748	$ 22,657
Fair value of derivative instruments designated as cash flow hedges:
Change in fair value of derivative instruments designated as cash flow hedges during the period, before tax	(5,480)	6,463	(13,626)	2,690
Less: reclassification adjustment for net losses included in net income from terminated cash flow hedges	193	273	394	539
Unrealized gains (losses) on cash flow hedges, before tax	(5,287)	6,736	(13,232)	3,229
Unrealized gains (losses) on investment securities:
Change in unrealized gains (losses) on investment securities arising during the period	1,781	(3,311)	7,102	472
Reclassification adjustment for losses included in net income	0	0	0	0
Amortization of unrealized net gain on securities transferred from available for sale to held to maturity	180	160	303	288
Unrealized gains (losses) on investment securities, before tax	1,961	(3,151)	7,405	760
Other comprehensive income (loss), before taxes	(3,326)	3,585	(5,827)	3,989
Income tax expense (benefit) related to items of other comprehensive income (loss)	(1,164)	1,256	(2,041)	1,397
Other comprehensive income (loss), net of tax	(2,162)	2,329	(3,786)	2,592
Total comprehensive income	1,795	15,034	22,962	25,249
Comprehensive income attributable to preferred shareholders	(575)	(95)	(670)	(190)
Comprehensive income attributable to participating securities	0	(222)	0	(413)
Comprehensive income available to common shareholders	$ 1,220	$ 14,717	$ 22,292	$ 24,646

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-In Capital	Accumulated Earnings	Accumulated Other Comprehensive Income	Total Shareholders’ Equity	Non-Controlling Interest	Preferred Stock Series C		Preferred Stock Series D
Beginning Balance, Preferred Stock at Dec. 31, 2014	[1]								$ 4,471		$ 37,935
Beginning Balance at Dec. 31, 2014	[1]	$ 408,533	$ 18,576	$ 239,528	$ 127,758	$ (19,737)	$ 408,531	$ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		22,657			22,657		22,657
Other comprehensive income		2,592				2,592	2,592
Share-based compensation		298		298			298
Restricted stock awards compensation		(1,557)		(1,557)			(1,557)
ESOP compensation expense		130		130			130
Stock option and director plans		414	26	388			414
Restricted stock awards, net		1,818	55	1,763			1,818
Net tax benefit related to stock option plans		121		121			121
Purchase of common shares by ESOP		(3,244)		(3,244)			(3,244)
Allocation of ESOP shares		(96)		(96)			(96)
Preferred stock conversion			365	4,106					(4,471)
Preferred stock dividends		(190)			(190)		(190)
Ending Balance, Preferred Stock at Jun. 30, 2015									0		37,935
Ending Balance at Jun. 30, 2015		431,476	19,022	241,437	150,225	(17,145)	431,474	2
Beginning Balance, Preferred Stock at Dec. 31, 2015		37,935							0	[1]	37,935	[1]
Beginning Balance at Dec. 31, 2015	[1]	380,751	19,078	242,979	102,142	(21,385)	380,749	2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		26,748			26,748		26,748
Other comprehensive income		(3,786)				(3,786)	(3,786)
Share-based compensation		282		282			282
Restricted stock awards compensation		550		550			550
ESOP compensation expense		162		162			162
Stock option and director plans		156	63	93			156
Warrants		804	95	709			804
Restricted stock awards, net		(189)	(5)	(184)			(189)
Net tax benefit related to stock option plans		303		303			303
Allocation of ESOP shares		5		5			5
Preferred stock dividends		(670)			(670)		(670)
Ending Balance, Preferred Stock at Jun. 30, 2016		37,935							$ 0		$ 37,935
Ending Balance at Jun. 30, 2016		$ 405,116	$ 19,231	$ 244,899	$ 128,220	$ (25,171)	$ 405,114	$ 2
[1]	Balances as of December 31, 2014 and December 31, 2015 are audited.

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net income	$ 26,748	$ 22,657
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred tax benefit	(45,054)	(35,191)
Impairment of tax credit investments	29,431	25,008
Accretion (amortization) of fair value adjustments related to acquisition	69	(85)
Net discount accretion	214	173
Loss on sale of investment securities	0	50
Gain on assets sold	(1,051)	(11)
Write-down of foreclosed assets	232	100
Proceeds from sale of mortgage loans held for sale	26,776	19,674
Mortgage loans originated and held for sale	(27,377)	(22,997)
Gain on sale of loans	(34)	(116)
Return on tax credit investment	(352)	0
Derivative gains on terminated interest rate hedge, net	658	539
Provision for loan losses	8,383	8,600
Depreciation and amortization	3,273	2,189
Share-based and other compensation expense	999	690
Increase in cash surrender value of bank-owned life insurance	(680)	(705)
Changes in operating assets and liabilities:
Change in other assets	(13,460)	(5,297)
Change in accrued interest receivable	(401)	(1,204)
Change in accrued interest payable	308	1,448
Change in other liabilities	(1,114)	(79)
Net cash provided by operating activities	7,568	15,443
Investing activities
Purchases of available for sale investment securities	(92,286)	0
Proceeds from maturities, prepayments, and calls of available for sale investment securities	83,600	11,770
Proceeds from maturities, prepayments, and calls of held to maturity securities	2,899	4,376
Net change in investments in short-term receivables	25,604	(13,440)
Reimbursement of investment in tax credit entities	13,810	0
Purchases of investments in tax credit entities	(41,410)	(27,200)
Loans originated, net of repayments	(320,899)	(186,720)
Proceeds from sale of bank premises and equipment	13,537	0
Cash received in acquisition, net	0	31,517
Purchases of bank premises and equipment	(7,107)	(2,727)
Proceeds from disposition of real estate owned	652	1,579
Net change in investment in real estate properties	1,366	(1,803)
Net cash used in investing activities	(320,234)	(182,648)
Financing activities
Net increase in deposits	87,905	204,215
Net change in repurchase agreements	6,506	(151)
Proceeds from borrowings	19,116	60,000
Proceeds from ESOP loan	0	3,392
Repayment of borrowings	(4,005)	0
Purchase of common stock by ESOP	0	(3,340)
Proceeds from issuance of common stock	771	414
Dividends paid	(670)	(190)
Net cash provided by financing activities	109,623	264,340
Net (decrease) increase in cash and cash equivalents	(203,043)	97,135
Cash and cash equivalents at beginning of period	349,054	50,888
Cash and cash equivalents at end of period	146,011	148,023
Supplemental Information for non-cash investing activities
Loans transferred to other real estate owned	$ 3,531	$ 642

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of First NBC Bank Holding Company (Company) have been prepared in accordance with generally accepted accounting principles for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include information or footnotes necessary for a complete presentation of financial position, results of operations, and cash flows in conformity with generally accepted accounting principles. However, in the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the financial statements have been included. The results of operations for the three-month and six -month periods ended June 30, 2016 are not necessarily indicative of the results that may be expected for the entire fiscal year. These statements should be read in conjunction with the Company’s audited financial statements, including the notes thereto, which were filed with the Securities and Exchange Commission as part of the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 . In preparing the financial statements, the Company is required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Nature of Operations The Company is a bank holding company that offers a broad range of financial services through First NBC Bank (Bank), a Louisiana state non-member bank, to businesses, institutions, and individuals in southeastern Louisiana and the Florida panhandle. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States and to prevailing practices within the banking industry. Principles of Consolidation The accompanying consolidated financial statements include the accounts of the Company and the Bank, and First NBC Bank’s wholly owned subsidiaries, which include First NBC Community Development, LLC (FNBC CDC), First NBC Community Development Fund, LLC (FNBC CDE) (collectively referred to as the Bank) and any variable interest entities of which the Company is the primary beneficiary. Substantially all of the variable interest entities (VIE) for which the Company is the primary beneficiary relate to tax credit investments. FNBC CDC is a Community Development Corporation formed to construct, purchase, and renovate affordable residential real estate properties in the New Orleans area. FNBC CDE is a Community Development Entity (CDE) formed to apply for and receive allocations of Federal New Markets Tax Credits (NMTC). Investments in Tax Credit Entities As part of its Community Reinvestment Act responsibilities and due to their favorable economics, the Company invests in tax credit-motivated projects. These projects produce tax credits issued under Federal Low-Income Housing, Federal Historic Rehabilitation, and Federal New Markets Tax Credits (Federal NMTC) programs. The Company generates its returns on tax credit motivated projects through the receipt of federal, and if applicable, state tax credits as well as equity returns. The federal tax credits are recorded as an offset to the income tax provision in the year that they are earned under federal income tax law – over 10 to 15 years, beginning in the year in which rental activity commences for Federal Low-Income Housing credits, in the year of the issuance of the certificate of occupancy and the property being placed into service for Federal Historic Rehabilitation credits, and over 7 years for Federal NMTC upon the investment of funds into the CDE. These credits, if not used in the tax return for the year of origination, can be carried forward for 20 years. The state credits are recorded in income when earned (usually when the project is placed in service) and sold to investors since the Company pays minimal state income taxes under Louisiana tax law. The Company invests in projects generating Federal Low-Income Housing credits, by investing in a tax credit entity, usually a limited liability company, which owns the real estate. The Company receives a 99.99% nonvoting interest in the entity that must be retained during the compliance period for the credits ( 15 years). Control of the tax credit entity rests in the .01% interest general partner, who has the power and authority to make decisions that impact economic performance of the project and is required to oversee and manage the project. The Company accounts for its investment in Federal Low-Income Housing credits utilizing the equity method of accounting. The Company begins to evaluate its investment for impairment at the time the tax credits are earned through the end of the 15 year compliance period. The Company evaluates its investment at the end of each reporting period for impairment and any residual returns are expected to be minor. For Federal Historic Rehabilitation credits, the Company invests in a tax credit entity, usually a limited liability company, which owns the real estate or a master tenant structure. In some cases, the Company receives a 99% nonvoting interest in the tax credit entity that must be retained during the compliance period for the credits ( 5 years). In some instances, the Company invests 99% in a pass through entity called a master tenant, which maintains an ownership interest in a limited liability company which owns the real estate. In most cases, the Company’s interest in the entity (in either structure) is generally reduced from a 99% interest to a 0% to 25% interest at the end of the compliance period. Control of the tax credit entity rests in the 1% interest general partner (in either structure), who has the power and authority to make decisions that impact economic performance of the project and is required to oversee and manage the project. The Company accounts for its investment in Federal Historic Rehabilitation credits utilizing the equity method of accounting. The Company begins to evaluate its investment for impairment at the time the credit is earned, which is typically in the year the project is placed in service, through the end of its compliance period. The Company evaluates its investment at the end of each reporting period for impairment and any expected residual returns reduce the amount of impairment recognized. For Federal NMTC, a different structure is required by federal tax law. In order to distribute Federal NMTC, the federal government allocates such credits to CDEs. The Company invests in both CDEs formed by unaffiliated parties and in CDEs formed by the Company. Projects must be commercial or real estate operations and are qualified by their location in low- income areas or by their employment of, or service to, low-income citizens. A CDE, in most cases, creates a special-purpose subsidiary for each project through which the credits are allocated and through which the proceeds from the tax credit investor and a leverage lender, if applicable, flow through to the project, which in turn generate the credit. The credits are calculated at 39% of the total CDE allocation to the project at the rate of 5% for the first three years and 6% for the next four years. Federal tax law requires special terms benefiting the qualified project, which can include below-market interest rates. The Company evaluates its investment for impairment under the equity method of accounting at the end of each reporting period, beginning at the time the tax credits are earned on the project through the end of the seven -year compliance period, and any residual returns are expected to be minor. When the Company also has a loan to the project, it is reported as a loan in the consolidated balance sheet, as the Company has credit exposure to the project and the loan is repaid at the end of the compliance period. In general, the debt has no principal payments during the compliance period but the Company may require the project to fund a sinking fund over the compliance period to achieve the same risk reduction effect as if principal is being amortized. When the Company is the tax credit investor in a CDE formed by an unaffiliated party, it has no control of the applicable CDE or the CDE’s special-purpose subsidiary. For projects which are funded through FNBC CDE, the Company consolidates its CDE and the specifically formed special-purpose entities since it maintains control over these entities; however, the Company does not have control over the entity which oversees the project. As part of the activities of FNBC CDE, the Company makes investments in the CDE for purposes of providing equity to the projects sponsored by the FNBC CDE. When a project is funded through FNBC CDE, the CDE will receive a CDE management fee at the time of the project's closing of approximately 4% and an annual fee of 0.5% of the qualified equity investment in the project. The annual fee is received until the end of the Federal NMTC compliance period. The CDE management fee earned is recorded in the consolidated statement of income as a component of noninterest income. The Company may pay a fee to the CDE when the project is funded through a CDE other than FNBC CDE at the time of a project's closing and annually during the compliance period for the allocation of the credits. The fee is recorded as a component of noninterest expense in the Company's consolidated statement of income over the Federal NMTC compliance period. The Company has the risk of credit recapture if the project fails during the compliance period for Federal Low-Income Housing and Federal Historic Rehabilitation transactions. For Federal NMTC transactions, the risk of credit recapture exists if investment requirements are not maintained during the compliance period. The risk of recapture for Federal NMTC transactions when the project is funded by FNBC CDE is described in Note 6. Such events, although rare, are accounted for when they occur and no such events have occurred to date involving FNBC CDE. Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are susceptible to a significant change in the near term are the allowance for loan losses, income tax provision, fair value adjustments, impairment on tax credit investments, and share-based compensation. Concentration of Credit Risk The Company’s loan portfolio consists of the various types of loans described in Note 5. Real estate or other assets secure most loans. The majority of these loans have been made to individuals and businesses in the Company’s market area of southeastern Louisiana and the Florida panhandle, which are dependent on the area economy for their livelihoods and servicing of their loan obligations. The Company does not have any significant concentrations to any one industry or customer. The Company maintains deposits in other financial institutions that may, from time to time, exceed the federally insured deposit limits. Reclassifications Some amounts previously reported have been adjusted to reflect certain reclassification adjustments to conform to the current period presentation. These include reclassifications of amounts previously reported in occupancy and equipment expenses to rental property expenses. The Company has presented rental property expenses, previously presented as a component of other noninterest expense in its consolidated statements of income, and rental property income, previously presented as a component of other noninterest income in its consolidated statements of income, as separate components on its consolidated statements of income. Restatement The Company's consolidated financial statements for periods ended prior to December 31, 2015, including unaudited quarterly financial information were restated in the Annual Report on Form 10-K for the year ended December 31, 2015 (the "Restatement") filed with the Securities and Exchange Commission ("SEC") on August 25, 2016. The restated unaudited quarterly financial information was presented in Note 33 in the Annual Report on Form 10-K for the year ended December 31, 2015, which included the applicable restatement adjustments for each individual quarterly period from March 31, 2014 through September 30, 2015, the last date through which financial statements have previously been issued. The Restatement corrected the use of an inappropriate amortization method in accounting for the Company's various investments in tax credit partnerships, as opposed to proper application of the equity method of accounting, consolidation of certain investments in Federal Low-Income Housing Tax Credit entities because such entities were determined to be variable interest entities in which the Company was the primary beneficiary, various other adjustments and income tax effects related to the these adjustments. All applicable amounts relating to this Restatement have been reflected in the consolidated financial statements and disclosed in the notes to the consolidated financial statements in this Form 10-Q. Recent Accounting Pronouncements ASU No. 2014-09 and 2015-14 In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 205): An Amendment of the FASB Accounting Standards Codification , which clarifies the principles for recognizing revenue from contracts with customers. The new accounting guidance, which does not apply to financial instruments, clarifies that an entity should recognize 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. As part of that principle, the entity should identify the contract(s) with the customer, identify the performance obligation(s) of the contract, determine the transaction price, allocate that transaction price to the performance obligation(s) of the contract, and then recognize revenue when or as the entity satisfies the performance obligation(s). In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date , which deferred the original effective date declared in ASU No. 2014-09 by one year. Accordingly, the amendments in ASU No. 2014-09 will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that annual reporting period. The amendments will be applied through the election of one of two retrospective methods. The Company is in the process of evaluating the new guidance and its impact on the Company's financial condition or results of operations. ASU No. 2014-15 In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern , which will require management to assess an entity’s ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards in connection with preparing financial statements for each annual and interim reporting period. The new accounting guidance is for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter, with early application permitted. The Company does not expect the new guidance to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-01 In January 2016, the FASB issued ASU No. 2016-01, Financial Instrument-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , which (1) requires equity investments to be measured at fair value with changes in fair value recognized in net income, (2) simplifies the impairment assessment of equity investments with readily determinable fair values by requiring a qualitative assessment to identify impairment, (3) eliminates the requirement to disclose the fair value instruments measured at amortized cost for entities that are not public business entities, (4) eliminates the requirement for public business entities to disclose the method and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (5) requires public business entities to use the exit price notion when measuring fair value of financial instruments for disclosure purposes, (6) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (7) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements, and (8) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity's other deferred tax assets. The new accounting guidance is for the annual period beginning after December 15, 2017, including interim periods. The Company does not expect the new guidance to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-02 In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires lessees to recognize a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term for all leases (with the exception of short-term leases) at the commencement date. The new lease guidance simplified the accounting for sale and leaseback transactions primarily because lessees must recognize lease assets and lease liabilities. Lessees will no longer be provided with a source of off-balance sheet financing. The guidance is for fiscal years beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. Early application is permitted for all entities upon issuance. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. The Company is currently evaluating the provisions of the ASU to determine the potential impact the new standard will have on the Company's financial condition or results of operations. ASU No. 2016-05 In March 2016, the FASB issued ASU 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, which clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument does not, in and of itself, require de-designation of that hedging relationship. The amendments apply to all reporting entities for which there is a change in the counterparty to a derivative instrument that has been designated as a hedging instrument. The amendments are effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The amendments may be applied on either a prospective basis or a modified retrospective basis. The adoption of this guidance is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-06 In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments, that requires embedded derivatives to be separated from the host contract and accounted for separately as derivatives if certain criteria are met. The amendments apply to all entities that are issuers of or investors in debt instruments (or hybrid financial instruments that are determined to have a debt host) with embedded call (put) options. The amendments clarify what steps are required when assessing whether the economic characteristics and risks or call (put) options are clearly and closely related to the economic characteristics and risks of their debt hosts, which is one of the criteria for bifurcating an embedded derivative. Consequently, when a call (put) option is contingently exercisable, an entity does not have to assess whether the event triggers the ability to exercise a call (put) option is related to interest rates or credit risks. Public business entities must apply the new requirements for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-07 In March 2016, the FASB issued ASU 2016-07, Investments- Equity Method and Joint Ventures (Topic 323), which simplifies the transition to the equity method of accounting. The amendments affect all entities that have an investment that becomes qualified for the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The amendments require that an entity that has an available for sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. The amendments are effective for all entities for fiscal years beginning after December 15, 2016. The adoption of this guidance is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-08 In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), that improves the operability and understandibility of the implementation guidance on principal versus agent considerations. The amendments relate to when another party, along with the entity, is involved in providing a good or service to a customer. It requires an entity to determine whether the nature of its promise is to provide that good or service to the customer (i.e., the entity is a principal) or to arrange for the good or service to be provided to the customer by the other party (i.e., the entity is an agent). Public entities should apply the amendments for annual reporting periods beginning after December 15, 2017. The adoption of this guidance is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-09 In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, to improve the accounting for employee share-based payments. Several aspects of the accounting for share-based payment award transactions are simplified, including income tax consequences; classification of awards as either equity or liabilities; and classification on the statement of cash flows. The amendments are effective for public business entities for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted for any interim or annual period. The Company is currently assessing the pronouncement and the impact of adoption. ASU No. 2016-10 In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, that clarifies the identification of performance obligations and licensing from revenue from contracts with customers. The amendments help determine the whether promises to transfer goods or services to a customer are separately identifiable by emphasizing that an entity determines whether the nature of its promise in the contract is to transfer each of the goods or services or whether the promise is to transfer a combined item (or items) to which promised goods and/or services are inputs. In addition, the amendments clarify how to determine whether an entity's promise to grant a license provides a customer with either a right to use the entity's intellectual property or a right to access the entity's intellectual property. Public entities should apply the amendments for annual reporting periods beginning after December 15, 2017, including interim reporting periods therein. Early application for public entities is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is currently assessing this pronouncement and adoption of this guidance, but it is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-12 In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients , which is intended to improve implementation guidance on certain narrow aspects of Topic 606. The amendments in this ASU: • Clarify how an entity assesses the collectability criterion in Step 1 of Topic 606; • Permit, as an accounting policy election, entities to exclude from the transaction price amounts collected from customers for all sales (and other similar) taxes; • Specify the measurement date of noncash consideration as the date of contract inception; • Clarify when a contract is considered completed for purposes of transition of Topic 606; and • Clarify that an entity that retrospectively applies the guidance in Topic 606 to each prior reporting period is not required to disclose the effect of the accounting change for the period of adoption. However, an entity is still required to disclose the effect of the changes on any prior periods retrospectively adjusted. Public entities should apply the amendments for annual reporting periods beginning after December 15, 2017, including interim reporting periods therein. Early application for public entities is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is currently assessing this pronouncement and adoption of this guidance, but it is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-13 In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The ASU, more commonly referred to as Current Expected Credit Losses, or CECL, requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. Public entities should apply the amendments for annual reporting periods beginning after December 15, 2019, including interim reporting periods therein. Early application for public entities is permitted as of annual reporting periods beginning after December 15, 2018, including interim reporting periods within that reporting period. The Company is currently evaluating the impact of the ASU on the Company’s financial condition or results of operations. ASU No. 2016-15 In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 320): Clarification of Certain Cash Receipts and Cash Payments, to address eight specific cash flow issues with the objective of reducing diversity in practice. The issues identified within the ASU include: debt prepayments or extinguishment costs; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. Public entities should apply the amendments for annual reporting periods beginning after December 15, 2017, including interim reporting periods therein. Early application for public entities is permitted. The Company is currently evaluating the impact of the ASU on the Company’s financial condition or results of operations.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions Acquisition of Certain Assets and Liabilities of First National Bank of Crestview On January 16, 2015, the Company acquired certain assets and assumed certain liabilities from the Federal Deposit Insurance Corporation (FDIC), as receiver for First National Bank of Crestview, a full-service commercial bank headquartered in Crestview, Florida, which was closed and placed into receivership. Under the terms of the agreement, the Company agreed to assume all of the deposit liabilities, and acquire approximately $62.3 million of assets, of the failed bank. The acquired assets included the failed bank's performing loans, substantially all of its investment securities portfolio, and its three banking facilities, with the FDIC retaining the remaining assets. The transaction did not include a loss-share agreement with the FDIC. The Company received a settlement amount from the FDIC of $10.0 million and recorded goodwill of $1.2 million , as shown in the table below. With this acquisition, the Company expanded into the Florida Panhandle market through the addition of the three banking locations and an experienced in-market team that enhances the Company's ability to compete in that market. (In thousands) Total consideration received $ 10,035 Fair value of assets acquired, including identifiable intangible assets 61,088 Fair value of liabilities assumed 72,314 Goodwill $ 1,191 Acquisition of State Investors Bancorp, Inc. On November 30, 2015, the Company acquired State Investors Bancorp, Inc. (SIBC), the parent company for State-Investors Bank, which conducted business from four full service banking offices in the New Orleans metropolitan area. Under the terms of the agreement, each share of SIBC common stock was converted into cash in the amount of $21.51 per share and each issued and outstanding option to purchase a share of SIBC common stock, including any unvested option, which became fully vested in connection with the completion of the merger, was canceled and converted into cash in an amount equal to the difference between $21.51 and the exercise price of the stock option. The Company acquired all of the outstanding common stock of the former SIBC shareholders and all outstanding stock options for a total consideration of $48.7 million , which resulted in goodwill of $8.6 million , as shown in the table below. With this acquisition, the Company expanded its presence in the New Orleans metropolitan area which enhances its ability to compete in that market. The Company projects cost savings will be recognized in future periods through the elimination of redundant operations. (In thousands) Total consideration paid $ 48,744 Fair value of assets acquired, including identifiable intangible assets 254,080 Fair value of liabilities assumed 213,981 Goodwill $ 8,645 The Company incurred merger and acquisition costs of $1.2 million during 2015 for the two acquisitions discussed above. The amount of revenue and earnings for the acquired entities for any reporting period prior to the acquisition was not material and therefore not presented herein. During the second quarter of 2016, the Company finalized the purchase price allocation related to the First National Bank of Crestview and State Investors Bancorp, Inc. acquisitions. There were no additional adjustments made to the purchase price allocations. The acquired assets and liabilities, as well as the adjustments to record the assets and liabilities at their estimated fair values, are presented in the following tables: First National Bank of Crestview (In thousands) As Acquired Fair Value Adjustments As recorded by First NBC Bank Assets Cash and due from banks $ 1,511 $ — $ 1,511 Short-term investments 19,971 — 19,971 Investment securities-available for sale 9,559 — 9,559 Loans 27,647 (1,203 ) (1) 26,444 Bank premises 3,120 — 3,120 Core deposit intangible — 188 (2) 188 Other assets 455 (160 ) 295 Total Assets $ 62,263 $ (1,175 ) $ 61,088 Liabilities Deposits: Non-interest bearing $ 22,680 $ — $ 22,680 Interest bearing 49,584 16 (3) 49,600 Total deposits 72,264 16 72,280 Other liabilities 34 — 34 Total Liabilities $ 72,298 $ 16 $ 72,314 (1) The amount represents the adjustment of the book value of First National Bank of Crestview's loans to their estimated fair value based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio. (2) The amount represents the estimated fair value of the core deposit intangible asset created in the acquisition. The core deposit intangible asset is being amortized over the estimated useful life of 12 years. (3) The adjustment is necessary because the weighted-average interest rate of First National Bank of Crestview's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment is being amortized to reduce future interest expense over the expected life of the deposits, which is estimated at 49 months . State Investors Bancorp, Inc. (In thousands) As Acquired Fair Value Adjustments As recorded by First NBC Bank Assets Cash and due from banks $ 20,031 $ — $ 20,031 Short-term investments 12,338 — 12,338 Investment securities-available for sale 27,388 (193 ) (1) 27,195 Loans 182,249 (2,830 ) (2) 179,419 Bank premises and equipment 7,708 592 (3) 8,300 Deferred tax asset 1,004 1,416 (4) 2,420 Core deposit intangible — 468 (5) 468 Other assets 3,909 — 3,909 Total Assets $ 254,627 $ (547 ) $ 254,080 Liabilities Deposits: Noninterest-bearing $ 11,416 $ — $ 11,416 Interest-bearing 141,235 1,245 (6) 142,480 Total deposits 152,651 1,245 153,896 Borrowings 55,913 868 (7) 56,781 Other liabilities 3,304 — 3,304 Total Liabilities $ 211,868 $ 2,113 $ 213,981 (1) The amount represents the adjustment of the book value of SIBC's investments to their estimated fair value based on fair values on the date of acquisition. (2) The amount represents the adjustment of the book value of loans acquired to their estimated fair value based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio. (3) The amount represents the adjustment of the book value of SIBC's bank premises and equipment to their estimated fair value at the acquisition date based on their appraised value on the date of acquisition. (4) The amount represents the deferred tax asset recognized on the fair value adjustment of SIBC acquired assets and assumed liabilities. (5) The amount represents the estimated fair value of the core deposit intangible asset created in the acquisition. The core deposit intangible asset is being amortized over the estimated useful life of 12 years. (6) The adjustment is necessary because the weighted-average interest rate of SIBC's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment is being amortized to reduce future interest expense over the life of the deposits. (7) The adjustment represents the adjustment of the book value of SIBC's borrowings to their estimated fair value based on current interest rates and the credit characteristics inherent in the liability.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following sets forth the computation of basic net income per common share and diluted net income per common share: For the Three Months Ended For the Six Months Ended (In thousands, except per share data) 2016 2015 2016 2015 (Restated) (Restated) Basic: Income available to common shareholders $ 3,382 $ 12,388 $ 26,078 $ 22,054 Weighted-average common shares outstanding 19,105 18,620 19,096 18,611 Basic earnings per share $ 0.18 $ 0.67 $ 1.37 $ 1.19 Diluted: Income available to common shareholders $ 3,382 $ 12,388 $ 26,078 $ 22,054 Weighted-average common shares outstanding 19,105 18,620 19,096 18,611 Effect of dilutive securities: Stock options outstanding 154 418 233 401 Restricted shares outstanding — 3 — 2 Warrants 74 124 78 121 Weighted-average common shares outstanding – assuming dilution 19,333 19,165 19,407 19,135 Diluted earnings per share $ 0.18 $ 0.65 $ 1.34 $ 1.15 The effect from 51 thousand and 34 thousand shares of restricted stock grants were not included in the computation of diluted earnings per share for the three and six month periods ended June 30, 2016, respectively, because such amounts would have had an antidilutive effect on earnings per share.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The amortized cost and market values of investment securities, with gross unrealized gains and losses, as of June 30, 2016 and December 31, 2015 , were as follows: June 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Market Value (In thousands) Less Than One Year Greater Than One Year Available for sale: U.S. government agency securities $ 146,702 $ 2,747 $ — $ — $ 149,449 U.S. Treasury securities 13,014 114 — — 13,128 Municipal securities 11,969 158 — — 12,127 Mortgage-backed securities 117,475 1,347 (274 ) (41 ) 118,507 Corporate bonds 8,021 27 — — 8,048 Other equity securities 20 — — — 20 $ 297,201 $ 4,393 $ (274 ) $ (41 ) $ 301,279 Held to maturity: Municipal securities $ 38,162 $ 2,588 $ — $ — $ 40,750 Mortgage-backed securities 41,436 3,274 — (18 ) 44,692 $ 79,598 $ 5,862 $ — $ (18 ) $ 85,442 December 31, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Market Value (In thousands) Less Than One Year Greater Than One Year Available for sale: U.S. government agency securities $ 151,369 $ 552 $ (1,591 ) $ (655 ) $ 149,675 U.S. Treasury securities 13,015 — — (312 ) 12,703 Municipal securities 12,115 76 — (91 ) 12,100 Mortgage-backed securities 78,227 367 (934 ) (149 ) 77,511 Corporate bonds 8,103 — (280 ) — 7,823 Other equity securities 20 — — — 20 Other debt securities 25,994 1 (1 ) — 25,994 $ 288,843 $ 996 $ (2,806 ) $ (1,207 ) $ 285,826 Held to maturity: Municipal securities $ 38,950 $ 1,888 $ — $ (18 ) $ 40,820 Mortgage-backed securities 43,124 674 (196 ) (1,622 ) 41,980 $ 82,074 $ 2,562 $ (196 ) $ (1,640 ) $ 82,800 During 2013, the Company transferred securities with a fair value of $95.4 million from available for sale to held to maturity. Management determined it had both the positive intent and ability to hold these securities until maturity. The reclassified securities consisted of municipal and mortgage-backed securities and were transferred due to movements in interest rates. The securities were reclassified at fair value at the time of transfer and represented a non-cash transaction. Accumulated other comprehensive income (loss) included pre-tax unrealized losses of $5.9 million on these securities at the date of transfer. As of June 30, 2016 , $4.2 million of pre-tax unrealized losses on these securities were included in accumulated other comprehensive income. These unrealized losses and offsetting other comprehensive income components are being amortized into net interest income over the remaining life of the related securities as a yield adjustment, resulting in no impact on future net income. As of June 30, 2016 and December 31, 2015 , the Company had 51 and 205 securities, respectively, that were in a loss position. The unrealized losses for each of the 51 securities relate to market interest rate changes. The Company has considered the current market for the securities in a loss position, as well as the severity and duration of the impairments, and expects that the value will recover. As of June 30, 2016 , management does not intend to sell these investments until the fair value exceeds amortized cost and it is more likely than not that the Company will not be required to sell debt securities before the anticipated recovery of the amortized cost basis of the security; thus, the impairment is determined not to be other-than-temporary. The amortized cost and estimated market values by contractual maturity of investment securities as of June 30, 2016 and December 31, 2015 are shown in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2016 December 31, 2015 (In thousands) Weighted Average Yield Amortized Cost Estimated Market Value Weighted Average Yield Amortized Cost Estimated Market Value Available for sale: Due in one year or less 1.91 % $ 84,431 $ 85,284 1.19 % $ 36,599 $ 36,558 Due after one year through five years 1.89 146,155 148,084 1.71 134,275 133,485 Due after five years through ten years 2.44 54,069 55,341 1.88 105,950 104,184 Due after ten years 2.44 12,546 12,570 2.29 12,019 11,599 Total securities 2.00 % $ 297,201 $ 301,279 1.77 % $ 288,843 $ 285,826 Held to maturity: Due in one year or less 9.68 % $ 8,710 $ 8,892 4.90 % $ 3,190 $ 3,068 Due after one year through five years 3.86 40,584 43,409 3.68 36,673 38,371 Due after five years through ten years 3.18 10,423 11,162 3.25 14,416 14,968 Due after ten years 3.67 19,881 21,979 3.44 27,795 26,393 Total securities 3.74 % $ 79,598 $ 85,442 3.57 % $ 82,074 $ 82,800 Securities with estimated market values of $225.5 million and $233.2 million at June 30, 2016 and December 31, 2015 , respectively, were pledged to secure public deposits, securities sold under agreements to repurchase, and long-term borrowings.

Loans

Loans	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Loans	Loans Major classifications of loans at June 30, 2016 and December 31, 2015 were as follows: (In thousands) June 30, 2016 December 31, 2015 Commercial real estate loans: Construction $ 548,563 $ 522,269 Mortgage(1) 1,642,719 1,423,545 2,191,282 1,945,814 Consumer real estate loans: Construction 16 9 Mortgage 234,787 264,422 234,803 264,431 Commercial and industrial loans 1,304,952 1,221,283 Loans to individuals, excluding real estate 28,139 21,688 Other loans 20,809 5,377 3,779,985 3,458,593 Less allowance for loan losses (76,964 ) (78,478 ) Loans, net $ 3,703,021 $ 3,380,115 (1) Included in commercial real estate loans, mortgage, are owner-occupied real estate loans of $502.1 million at June 30, 2016 and $449.1 million at December 31, 2015 . A summary of changes in the allowance for loan losses during the three and six months ended June 30, 2016 and June 30, 2015 is as follows: Three Months Ended June 30, 2016 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Balance, beginning of period $ 6,706 $ 21,115 $ 5,293 $ 50,746 $ 329 $ 84,189 Charge-offs (25 ) (300 ) (45 ) (505 ) (5 ) (880 ) Recoveries — 9 4 2 5 20 (Recovery) Provision (609 ) 6,260 (1,408 ) (10,627 ) 19 (6,365 ) Balance, end of period $ 6,072 $ 27,084 $ 3,844 $ 39,616 $ 348 $ 76,964 Three Months Ended June 30, 2015 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Balance, beginning of period $ 4,733 $ 16,750 $ 3,316 $ 20,205 $ 191 $ 45,195 Charge-offs (10 ) (501 ) (41 ) (122 ) (24 ) (698 ) Recoveries — 243 2 5 4 254 Provision 628 327 257 4,388 — 5,600 Balance, end of period $ 5,351 $ 16,819 $ 3,534 $ 24,476 $ 171 $ 50,351 Six Months Ended June 30, 2016 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Balance, beginning of period $ 5,027 $ 18,016 $ 3,500 $ 51,736 $ 199 $ 78,478 Charge-offs (25 ) (496 ) (45 ) (9,364 ) (7 ) (9,937 ) Recoveries — 13 4 14 9 40 Provision (Recovery) 1,070 9,551 385 (2,770 ) 147 8,383 Balance, end of period $ 6,072 $ 27,084 $ 3,844 $ 39,616 $ 348 $ 76,964 Six Months Ended June 30, 2015 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Balance, beginning of period $ 4,030 $ 14,965 $ 3,316 $ 19,814 $ 211 $ 42,336 Charge-offs (12 ) (530 ) (41 ) (272 ) (50 ) (905 ) Recoveries — 243 2 66 9 320 Provision 1,333 2,141 257 4,868 1 8,600 Balance, end of period $ 5,351 $ 16,819 $ 3,534 $ 24,476 $ 171 $ 50,351 The allowance for loan losses and recorded investment in loans, including loans acquired with deteriorated credit quality, as of the dates indicated are as follows: June 30, 2016 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 516 $ 4,722 $ 384 $ 20,433 $ 25 $ 26,080 Collectively evaluated for impairment 5,556 22,362 3,460 19,183 323 50,884 Total $ 6,072 $ 27,084 $ 3,844 $ 39,616 $ 348 $ 76,964 Outstanding loan balances: Individually evaluated for impairment $ 12,704 $ 25,554 $ 6,017 $ 127,311 $ 270 $ 171,856 Collectively evaluated for impairment 535,875 1,617,165 228,770 1,198,450 27,869 3,608,129 Total $ 548,579 $ 1,642,719 $ 234,787 $ 1,325,761 $ 28,139 $ 3,779,985 December 31, 2015 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 508 $ 5,674 $ 322 $ 40,176 $ 13 $ 46,693 Collectively evaluated for impairment 4,519 12,342 3,178 11,560 186 31,785 Total $ 5,027 $ 18,016 $ 3,500 $ 51,736 $ 199 $ 78,478 Outstanding loan balances: Individually evaluated for impairment $ 2,630 $ 30,007 $ 4,318 $ 119,652 $ 144 $ 156,751 Collectively evaluated for impairment 519,648 1,393,538 260,104 1,107,008 21,544 3,301,842 Total $ 522,278 $ 1,423,545 $ 264,422 $ 1,226,660 $ 21,688 $ 3,458,593 Credit quality indicators on the Company’s loan portfolio, including loans acquired with deteriorated credit quality, as of the dates indicated were as follows: June 30, 2016 (In thousands) Pass and Pass/Watch Special Mention Substandard Doubtful Total Construction $ 451,226 $ — $ 97,353 $ — $ 548,579 Commercial real estate 1,546,679 12,216 83,824 — 1,642,719 Consumer real estate 218,732 5,533 10,522 — 234,787 Commercial and industrial 1,126,209 9,754 170,474 19,324 1,325,761 Consumer 27,779 8 352 — 28,139 Total loans $ 3,370,625 $ 27,511 $ 362,525 $ 19,324 $ 3,779,985 December 31, 2015 (In thousands) Pass and Pass/Watch Special Mention Substandard Doubtful Total Construction $ 444,713 $ — $ 77,565 $ — $ 522,278 Commercial real estate 1,325,513 15,230 82,802 — 1,423,545 Consumer real estate 252,707 175 11,540 — 264,422 Commercial and industrial 1,038,567 7,377 161,391 19,325 1,226,660 Consumer 21,364 13 311 — 21,688 Total loans $ 3,082,864 $ 22,795 $ 333,609 $ 19,325 $ 3,458,593 The table above as of June 30, 2016 included $3.4 million of substandard loans which are loans acquired with deteriorated credit quality and accounted for under ASC 310-30. As of December 31, 2015 , included in the above table were $3.2 million of substandard loans which are loans acquired with deteriorated credit quality and accounted for under ASC 310-30. The above classifications follow regulatory guidelines and can generally be described as follows: • Pass and pass/watch loans are of satisfactory quality. • Special mention loans have an existing weakness that could cause future impairment, including the deterioration of financial ratios, past due status, questionable management capabilities, and possible reduction in the collateral values. • Substandard loans have an existing specific and well-defined weakness that may include poor liquidity and deterioration of financial ratios. The loan may be past due and related deposit accounts may be experiencing overdrafts. Immediate corrective action is necessary. • Doubtful loans have specific weaknesses that are severe enough to make collection or liquidation in full highly questionable and improbable. An aged analysis of past due loans, including loans acquired with deteriorated credit quality, as of the dates indicated is as follows: June 30, 2016 (In thousands) Greater Than 30 and Fewer Than 90 Days Past Due 90 Days and Greater Past Due Total Past Due Current Loans Total Loans Real estate loans: Construction $ 656 $ 11,375 $ 12,031 $ 536,548 $ 548,579 Commercial real estate 3,941 5,111 9,052 1,633,667 1,642,719 Consumer real estate 3,737 4,547 8,284 226,503 234,787 Total real estate loans 8,334 21,033 29,367 2,396,718 2,426,085 Other loans: Commercial and industrial 4,648 11,411 16,059 1,309,702 1,325,761 Consumer 38 81 119 28,020 28,139 Total other loans 4,686 11,492 16,178 1,337,722 1,353,900 Total loans $ 13,020 $ 32,525 $ 45,545 $ 3,734,440 $ 3,779,985 December 31, 2015 (In thousands) Greater Than 30 and Fewer Than 90 Days Past Due 90 Days and Greater Past Due Total Past Due Current Loans Total Loans Real estate loans: Construction $ 430 $ 981 $ 1,411 $ 520,867 $ 522,278 Commercial real estate 979 5,943 6,922 1,416,623 1,423,545 Consumer real estate 5,628 2,517 8,145 256,277 264,422 Total real estate loans 7,037 9,441 16,478 2,193,767 2,210,245 Other loans: Commercial and industrial 2,018 2,588 4,606 1,222,054 1,226,660 Consumer 385 190 575 21,113 21,688 Total other loans 2,403 2,778 5,181 1,243,167 1,248,348 Total loans $ 9,440 $ 12,219 $ 21,659 $ 3,436,934 $ 3,458,593 The following is a summary of information pertaining to impaired loans excluding loans acquired with deteriorated credit quality, as of the periods indicated: June 30, 2016 (In thousands) Recorded Investment Contractual Balance Related Allowance With no related allowance recorded: Construction $ 10,596 $ 10,609 $ — Commercial real estate 5,364 6,830 — Consumer real estate 3,814 3,898 — Commercial and industrial 3,958 6,966 — Consumer 167 167 — Total $ 23,899 $ 28,470 $ — With an allowance recorded: Construction $ 2,108 $ 2,122 $ 516 Commercial real estate 20,190 20,853 4,722 Consumer real estate 2,203 2,287 384 Commercial and industrial 123,353 131,221 20,433 Consumer 103 103 25 Total $ 147,957 $ 156,586 $ 26,080 Total impaired loans: Construction $ 12,704 $ 12,731 $ 516 Commercial real estate 25,554 27,683 4,722 Consumer real estate 6,017 6,185 384 Commercial and industrial 127,311 138,187 20,433 Consumer 270 270 25 Total $ 171,856 $ 185,056 $ 26,080 December 31, 2015 (In thousands) Recorded Investment Contractual Balance Related Allowance With no related allowance recorded: Construction $ 902 $ 915 $ — Commercial real estate 12,090 12,424 — Consumer real estate 2,802 2,938 — Commercial and industrial 6,072 6,264 — Consumer 130 130 — Total $ 21,996 $ 22,671 $ — With an allowance recorded: Construction $ 1,728 $ 1,755 $ 508 Commercial real estate 17,917 17,982 5,674 Consumer real estate 1,516 1,534 322 Commercial and industrial 113,580 113,862 40,176 Consumer 14 14 13 Total $ 134,755 $ 135,147 $ 46,693 Total impaired loans: Construction $ 2,630 $ 2,670 $ 508 Commercial real estate 30,007 30,406 5,674 Consumer real estate 4,318 4,472 322 Commercial and industrial 119,652 120,126 40,176 Consumer 144 144 13 Total $ 156,751 $ 157,818 $ 46,693 For the Three Months Ended June 30, 2016 June 30, 2015 (In thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Construction $ 10,352 $ — $ 883 $ 18 Commercial real estate 5,683 — 3,402 14 Consumer real estate 3,466 6 2,364 — Commercial and industrial 3,929 — 7,514 — Consumer 94 — 99 — Total $ 23,524 $ 6 $ 14,262 $ 32 With an allowance recorded: Construction $ 2,132 $ — $ 22 $ — Commercial real estate 22,199 6 10,143 60 Consumer real estate 2,214 — 318 — Commercial and industrial 118,710 297 16,322 — Consumer 205 — 1 — Total $ 145,460 $ 303 $ 26,806 $ 60 Total impaired loans: Construction $ 12,484 $ — $ 905 $ 18 Commercial real estate 27,882 6 13,545 74 Consumer real estate 5,680 6 2,682 — Commercial and industrial 122,639 297 23,836 — Consumer 299 — 100 — Total $ 168,984 $ 309 $ 41,068 $ 92 For the Six Months Ended June 30, 2016 June 30, 2015 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Construction $ 5,749 $ — $ 891 $ 18 Commercial real estate 8,727 20 4,529 14 Consumer real estate 3,308 7 2,348 3 Commercial and industrial 5,015 — 371 — Consumer 149 — 163 — Total $ 22,948 $ 27 $ 8,302 $ 35 With an allowance recorded: Construction $ 1,912 $ 17 $ 21 $ — Commercial real estate 19,060 75 8,711 60 Consumer real estate 1,860 7 292 — Commercial and industrial 118,466 299 16,038 4 Consumer 59 — 2 — Total $ 141,357 $ 398 $ 25,064 $ 64 Total impaired loans: Construction $ 7,661 $ 17 $ 912 $ 18 Commercial real estate 27,787 95 13,240 74 Consumer real estate 5,168 14 2,640 3 Commercial and industrial 123,481 299 16,409 4 Consumer 208 — 165 — Total $ 164,305 $ 425 $ 33,366 $ 99 Also presented in the above table is the average recorded investment of the impaired loans and the related amount of interest recognized during the time within the period that the impaired loans were impaired. When the ultimate collectability of the total principal of an impaired loan is in doubt and the loan is on nonaccrual status, all payments are applied to principal under the cost recovery method. When the ultimate collectability of the total principal of an impaired loan is not in doubt and the loan is in nonaccrual status, contractual interest is credited to interest income when received under the cash basis method. In the table above, all interest recognized represents cash collected. The average balances are calculated based on the month-end balances of the financing receivables of the period reported. As of June 30, 2016 , there were no cash secured tuition loans that were past due 90 days or more still accruing interest. There were $0.1 million in cash secured tuition loans that were past due 90 days or more still accruing interest as of December 31, 2015 . The following is a summary of information pertaining to nonaccrual loans as of the periods indicated: (In thousands) June 30, 2016 December 31, 2015 Nonaccrual loans: Construction $ 12,691 $ 2,633 Commercial real estate 21,634 27,937 Consumer real estate 5,948 4,538 Commercial and industrial 126,727 119,705 Consumer 310 125 Total $ 167,310 $ 154,938 As of June 30, 2016 and December 31, 2015 , the average recorded investment in nonaccrual loans was $163.1 million and $34.0 million , respectively. The amount of interest income that would have been recognized on nonaccrual loans based on contractual terms was $4.4 million and $1.8 million at June 30, 2016 and December 31, 2015 , respectively. Information about the Company’s TDRs at June 30, 2016 and December 31, 2015 is presented in the following tables: (In thousands) Current Greater Than 30 Days Past Due Nonaccrual TDRs Total TDRs As of June 30, 2016 Real estate loans: Construction $ — $ — $ 1,249 $ 1,249 Commercial real estate 1,842 — — 1,842 Consumer real estate 561 — 127 688 Total real estate loans 2,403 — 1,376 3,779 Other loans: Commercial and industrial 447 — 115,375 115,822 Total loans $ 2,850 $ — $ 116,751 $ 119,601 (In thousands) Current Greater Than 30 Days Past Due Nonaccrual TDRs Total TDRs As of December 31, 2015 Real estate loans: Construction $ 1 $ — $ 366 $ 367 Commercial real estate 2,215 — 1,393 3,608 Consumer real estate 585 — 771 1,356 Total real estate loans 2,801 — 2,530 5,331 Other loans: Commercial and industrial 482 — 109,727 110,209 Total loans $ 3,283 $ — $ 112,257 $ 115,540 There were no TDRs modified during the three months ended June 30, 2016 and June 30, 2015. The following table provides information on how the TDRs were modified during the six months ended June 30, 2016 and June 30, 2015. (In thousands) June 30, 2016 June 30, 2015 Maturity and interest rate adjustment $ — $ — Movement to, or extension of, interest rate-only payments 6,324 — Other concessions (1) — — Total $ 6,324 $ — A summary of information pertaining to modified terms of loans, as of the dates indicated, is as follows: As of June 30, 2016 (In thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Troubled debt restructuring: Construction 1 $ 1,249 $ 1,249 Commercial real estate 1 1,842 1,842 Consumer real estate 1 688 688 Commercial and industrial 18 115,822 115,822 21 $ 119,601 $ 119,601 As of December 31, 2015 (In thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Troubled debt restructuring: Construction 3 $ 367 $ 367 Commercial real estate 3 3,608 3,608 Consumer real estate 5 1,356 1,356 Commercial and industrial 30 110,209 110,209 41 $ 115,540 $ 115,540 None of the performing TDRs defaulted subsequent to the restructuring through the date the financial statements were available to be issued. As of June 30, 2016 , the Company was committed to lend $0.1 million in additional funds to customers whose loans were classified as impaired or TDR. As of December 31, 2015 , the Company was not committed to lend additional funds to any customer whose loan was classified as impaired or as a TDR.

Investments in Tax Credit Entit

Investments in Tax Credit Entities	6 Months Ended
	Jun. 30, 2016
Investments, All Other Investments [Abstract]
Investments in Tax Credit Entities	Investments in Tax Credit Entities Federal NMTC Investment in Bank Owned CDE The Bank owns a CDE which competes each year for a Federal New Markets Tax Credits allocation. The Federal NMTC program is administered by the Community Development Financial Institutions Fund of the U.S. Treasury and is aimed at stimulating economic and community development and job creation in low-income communities. The program provides federal tax credits to investors who make qualified equity investments (QEIs) in a CDE. The CDE is required to invest the proceeds of each QEI in projects located in or benefiting low-income communities, which are generally defined as those census tracts with poverty rates greater than 20% and/or median family incomes that are less than or equal to 80% of the area median family income. FNBC CDE has received allocations of Federal NMTC totaling $118.0 million since 2011. These allocations generated $46.0 million in tax credits. The credit provided to the investor totals 39% of each QEI in a CDE and is claimed over a seven -year credit allowance period. In each of the first three years, the investor receives a credit equal to 5% of the total QEI allocated to each project. For each of the remaining four years, the investor receives a credit equal to 6% of the total QEI allocated to each project. The Company has received up to $46.0 million in tax credits over the seven -year credit allowance period, beginning with the period in which the QEI was made, for its total QEI of $118.0 million . Through June 30, 2016 , FNBC CDE had invested in allocations of $118.0 million , of which $40.0 million was invested by the Company and $78.0 million was invested by other investors and leverage lenders, which include the Company. Of the $78.0 million invested by other investors and leverage lenders, $17.5 million was invested by the Company as the leverage lender. The Company's investment in its subsidiary CDE is eliminated upon consolidation. While the leverage lender's portion of the investment in the CDE is classified as a loan, the remaining investment in the CDE is accounted for as an equity method investment included in investment in tax credit entities in the accompanying consolidated balance sheets and evaluated at each reporting date for impairment. The impairment is evaluated based on the remaining tax credits available along with any applicable equity income or loss allocations. Impairment, if any, is recorded in the consolidated statement of income as a component of noninterest expense as well as any applicable equity income or loss allocations. The Federal NMTC claimed by the Company, with respect to each QEI, remain subject to recapture over each QEI’s credit allowance period upon the occurrence of any of the following: • CDE does not invest substantially all (defined as a minimum of 85% ) of the QEI proceeds in qualified low-income community investments; • CDE ceases to be a CDE; or • CDE redeems its QEI investment prior to the end of the current credit allowance period. At June 30, 2016 and December 31, 2015 , none of the above recapture events had occurred, nor, in the opinion of management, are such events anticipated to occur in the foreseeable future. As of June 30, 2016 , FNBC CDE had total assets of $132.3 million , consisting of cash of $7.3 million , loans of $112.3 million and other assets of $12.7 million , with liabilities of $0.5 million and capital of $131.8 million . Based on the structure of these transactions, the Company expects to recover its investment solely through use of the tax credits that were generated by the investments and any equity returns received through the limited partnership. Investments in Non-Bank Owned CDEs The Company is also a limited partner in several tax-advantaged limited partnerships and a shareholder in several C corporations whose purpose is to invest in approved Federal NMTC projects through CDEs that are not associated with FNBC CDE. During 2014, several of these partnerships that the Company was a limited partner in converted to C corporations. The Company’s ownership in the CDEs did not change based on the conversion. These investments are accounted for using the equity method of accounting and are included in investment in tax credit entities in the accompanying consolidated balance sheets. The limited partnerships and C corporations are considered VIEs. The VIEs have not been consolidated because the Company is not considered the primary beneficiary. The Company's investment in Federal NMTC partnerships and C corporations, net of the loans to the investment fund, are evaluated for impairment at the end of each reporting period based on the remaining tax credits available along with any equity income or loss allocations. Impairment, if any, is recorded in the consolidated statement of income as a component of noninterest expense as well as any applicable equity income or loss allocations. All of the Company’s investments in Federal NMTC structures are privately held, and their market values are not readily determinable. Based on the structure of these transactions, the Company expects to recover its investment solely through use of the tax credits that were generated by the investments and any equity returns received through the limited partnership. Federal Low-Income Housing Tax Credits The Company is a limited partner in tax-advantaged limited partnerships whose purpose is to invest in approved Federal Low-Income Housing tax credit projects. The tax credits associated with these investments are typically received over a 10 to 15 year period subject to recapture. These investments are accounted for using the equity method of accounting and are included in investments in tax credit entities in the accompanying consolidated balance sheets. The limited partnerships are considered to be VIEs and are evaluated for consolidation based on the Company's determination if it is the primary beneficiary. The Company has determined that it is not the primary beneficiary with respect to the limited partnerships. Thus, the VIEs have not been consolidated except for three Federal Low-Income Housing investments which were consolidated (See Note 7 for further details.) The Company utilizes the effective yield method to evaluate impairment. Impairment, if any, is recorded in the consolidated statement of income as a component of noninterest expense as well as any applicable equity income or loss allocations. All of the Company’s investments in Federal Low-Income Housing partnerships are evaluated for impairment at the end of each reporting period. Based on the structure of these transactions, the Company expects to recover its remaining investments at June 30, 2016 through the use of the tax credits that were generated by the investments and any equity returns received through the limited partnerships. Federal Historic Rehabilitation Tax Credits The Company is a limited partner in several tax-advantaged limited partnerships whose purpose is to invest in approved Federal Historic Rehabilitation tax credit projects. The tax credits generated on these investments are received in the year that the project is placed in service and subject to recapture over a 5 year period. These investments are accounted for using the equity method of accounting and are included in investments in tax credit entities in the accompanying consolidated balance sheets. The limited partnerships are considered to be VIEs and are evaluated for consolidation based on the Company's determination if it is the primary beneficiary. The Company has determined that it is not the primary beneficiary with respect to any of the limited partnerships and, thus, the VIEs have not been consolidated. All of the Company’s investments in limited partnerships are evaluated for impairment at the end of each reporting period and the Company records impairment, if any, in its consolidated statement of income as a component of noninterest expense. Impairment is calculated based upon future cash flows to be received during the Company's ownership period and the residual amount expected to be received upon disposition of its ownership position. Based on the structure of these transactions, the Company expects to recover its remaining investments in Federal Historic Rehabilitation tax credits at June 30, 2016 through the future cash flows and equity ownership in the underlying projects. State Historic Rehabilitation Tax Credits In connection with its limited partner interest in several tax-advantaged limited partnerships whose purpose is to invest in approved Federal Historic Rehabilitation tax credit projects, the Company can receive Louisiana State Historic Rehabilitation tax credits. These credits are certified by the State of Louisiana and are earned by the Company once the project is placed in service and then sold to investors after the State Historic Rehabilitation tax credits are certified by the State of Louisiana and transferred from the project to the Company. The credits are typically sold within 12 months of the project being placed in service. The Company evaluates its investment for impairment at the end of each reporting period. Impairment, if any, is recorded in its consolidated statement of income as a component of noninterest expense. State NMTC Investments in Non-Bank Owned CDEs The Company is a limited partner in several tax-advantaged limited partnerships that are CDEs, whose purpose is to invest in approved State NMTC projects that are not associated with FNBC CDE. Based on the structure of these transactions, the Company expects to recover its remaining investments in State NMTC at June 30, 2016 through the transfer of its ownership interest to third party investors. The Company evaluates its investment for impairment at the end of each reporting period. Impairment, if any, is recorded in its consolidated statement of income as a component of noninterest expense. The tables below set forth the Company's investment in Federal and State NMTC, Federal Low-Income Housing, and Federal and State Historic Rehabilitation tax credits, along with the credits earned and expected to be generated through its participation in these programs as of June 30, 2016 and December 31, 2015 : June 30, 2016 (In thousands) Investment Total Impairment(1) Loans to Investment Funds(2) Elimination(3) Net Investment Tax Benefits Recognized Through December 31, 2015 Tax Benefits Earned and Expected to be Recognized in 2016 Tax Benefits Earned and Expected to be Recognized in 2017, and Thereafter Total Tax Benefits Earned and to be Recognized NMTC: Federal: Bank Owned CDEs $ 154,720 $ (11,828 ) $ — $ (118,000 ) $ 24,892 $ 23,070 $ 7,080 $ 15,870 $ 46,020 Non-Bank Owned CDEs 191,303 (27,898 ) (141,200 ) — 22,205 46,349 9,792 18,084 74,225 Total NMTC 346,023 (39,726 ) (141,200 ) (118,000 ) 47,097 69,419 16,872 33,954 120,245 Low-Income Housing 30,175 (7,177 ) — — 22,998 17,153 5,051 33,921 56,125 Historic Rehabilitation: Federal(4) 89,991 (76,280 ) — — 13,711 75,305 51,381 — 126,686 State 13,437 (4,363 ) — — 9,074 — — — — Total Historic Rehabilitation(5) 103,428 (80,643 ) — — 22,785 75,305 51,381 — 126,686 Total $ 479,626 $ (127,546 ) $ (141,200 ) $ (118,000 ) $ 92,880 $ 161,877 $ 73,304 $ 67,875 $ 303,056 (1) Amount represents impairment recorded from the date of original investment through the current period, as evaluated by the Company at the end of each reporting period. (2) Interest-only leverage loans made to the investment fund during the compliance period for Federal NMTC. This amount is recorded as an offset to the Federal NMTC investment due to the interest-only leverage loan being repaid at the end of the compliance period. (3) Through June 30, 2016 , FNBC CDE received allocations of Federal NMTC from the CDFI Fund of the U.S. Treasury totaling $118.0 million over a three year period beginning in 2011. These investments are eliminated upon consolidation by the Company. (4) As of June 30, 2016 , the Company had $2.6 million invested and $23.0 million in outstanding commitments in Federal Historic Rehabilitation tax credit projects which the Company expects to generate Federal Historic Rehabilitation tax credits in 2017 and thereafter when the projects are completed, receive the certificates of occupancy, and the property is placed into service. The amount of tax credits to be received will be determined when the costs are certified. (5) The total accumulated impairment includes $ 0.5 million in additional accrued impairment in 2016 which is owed to the project based on the investment payment terms. December 31, 2015 (In thousands) Investment Total Impairment(1) Loans to Investment Funds(2) Elimination(3) Net Investment Tax Benefits Recognized Through December 31, 2014 Tax Benefits Recognized in 2015 Tax Benefits Earned and to be Recognized in 2016, and Thereafter Total Tax Benefits Earned and to be Recognized NMTC: Federal: Bank Owned CDEs $ 154,720 $ (8,288 ) $ — $ (118,000 ) $ 28,432 $ 16,490 $ 6,580 $ 22,950 $ 46,020 Non-Bank Owned CDEs 171,303 (23,738 ) (127,520 ) — 20,045 36,580 9,769 20,076 66,425 State 13,810 — — — 13,810 — — — — Total NMTC 339,833 (32,026 ) (127,520 ) (118,000 ) 62,287 53,070 16,349 43,026 112,445 Low-Income Housing 30,166 (5,979 ) — — 24,187 13,188 3,965 38,972 56,125 Historic Rehabilitation: Federal(4) 69,177 (55,220 ) — — 13,957 34,335 40,970 — 75,305 State 12,518 (4,363 ) — — 8,155 — — — — Total Historic Rehabilitation(5) 81,695 (59,583 ) — — 22,112 34,335 40,970 — 75,305 Total $ 451,694 $ (97,588 ) $ (127,520 ) $ (118,000 ) $ 108,586 $ 100,593 $ 61,284 $ 81,998 $ 243,875 (1) Amount represents impairment recorded from the date of original investment through the current period, as evaluated by the Company at the end of each reporting period. (2) Interest-only leverage loans made to the investment fund during the compliance period for Federal NMTC. This amount is recorded as an offset to the Federal NMTC investment due to the interest-only leverage loan being repaid at the end of the compliance period. (3) Through December 31, 2015 , FNBC CDE received allocations of Federal NMTC from the CDFI Fund of the U.S. Treasury totaling $118.0 million over a three year period beginning in 2011. These investments are eliminated upon consolidation by the Company. (4) As of December 31, 2015 , the Company had $10.9 million invested and $ 39.1 million in outstanding commitments in Federal Historic Rehabilitation tax credit projects which the Company expects to generate Federal Historic Rehabilitation tax credits in 2016, 2017 and 2018 when the projects are completed, receive the certificates of occupancy, and the property is placed into service. The amount of tax credits to be received will be determined when the costs are certified. (5) The total accumulated impairment includes $ 5.8 million in additional accrued impairment in 2015 which is owed to the project based on the investment payment terms. The impairment of tax credit investments for the three and six month periods ended June 30, 2016 and 2015 were as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, (In thousands) 2016 2015 2016 2015 (Restated) (Restated) Federal NMTC $ 3,850 $ 3,703 $ 7,700 $ 7,406 Federal Low-Income Housing 599 (765 ) 1,198 158 Federal and State Historic Rehabilitation 10,267 8,723 20,533 17,444 Total impairment $ 14,716 $ 11,661 $ 29,431 $ 25,008 The Company also made loans and leverage loans in the normal course of business to the tax credit related projects. These loans are subject to the Company's underwriting criteria and all loans were performing according to their contractual terms at June 30, 2016 . These loans were classified in the Company's loan portfolio at June 30, 2016 and December 31, 2015 as follows: (In thousands) June 30, 2016 December 31, 2015 Construction $ 59,110 $ 43,962 Commercial real estate 78,351 67,579 Commercial and industrial 145,201 117,389 Total loans $ 282,662 $ 228,930

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2016
Investments, All Other Investments [Abstract]
Variable Interest Entities	Variable Interest Entities During 2013, the Company entered into a loan workout arrangement with a borrower. The result of this workout arrangement is considered to be a VIE, whereby the Company is considered the primary beneficiary and must consolidate the VIE. The initial recognition of this VIE relationship was accounted for using acquisition accounting. Under acquisition accounting, the assets and liabilities acquired are accounted for at market value and intercompany balances are eliminated. The asset acquired from the debtor, which consisted of a net operating loss, is included in the accompanying consolidated balance sheets. A subsidiary of the Bank, FNBC CDC, is the managing member of several tax-advantaged limited partnerships whose purpose are to invest in approved Federal Low-Income Housing tax credit projects. This limited partnership is considered to be a VIE, whereby the Company is considered the primary beneficiary and must consolidate the VIE. As such, no impairment charges have been recorded with respect to this investment. The initial recognition of this VIE relationship was accounted for using acquisition accounting. Under acquisition accounting, the assets and liabilities acquired are accounted for at fair value and intercompany balances are eliminated. As of June 30, 2016 , the Company included in its consolidated financial statements the VIE's total assets of $70.2 million , consisting of real estate of $69.4 million and other assets of $0.8 million , with liabilities of $5.5 million and capital of ($25.4) million .

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Borrowings	Borrowings Short-term Borrowings The following is a summary of short-term borrowings at June 30, 2016 and December 31, 2015 : (In thousands) June 30, 2016 December 31, 2015 FHLB $ 7,022 $ 8,000 Total short-term borrowings $ 7,022 $ 8,000 The Company's short-term borrowings at June 30, 2016 and December 31, 2015 consisted of advances from the Federal Home Loan Bank of Dallas (FHLB). These advances mature between August 22, 2016 and June 1, 2017 and had a weighted average interest rate of 0.85% as of June 30, 2016 . The Company paid off a $2.0 million short-term borrowing that matured on March 21, 2016. Long-term Borrowings During the first quarter of 2016, the Company entered into a $ 19.1 million loan with the State of Louisiana Office of Community Development, which bears interest at 1% and is due on September 1, 2045. The loan is related to a Federal Low-Income Housing tax credit investment.

Derivative - Interest Rate Swap

Derivative - Interest Rate Swap Agreements	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative - Interest Rate Swap Agreements	Derivative - Interest Rate Swap Agreements Interest Rate Swaps. In March 2016, the Company entered into two delayed interest rate swaps with Counterparty C to manage exposure against the variability in the expected future cash flows attributed to changes in the benchmark interest rate on a portion of its variable-rate debt. The Company entered into these interest rate swap agreements to convert a portion of its forecasted variable-rate debt to a fixed rate, which is a cash flow hedge of a forecasted transaction. The notional amounts of each of the two derivative contracts is $55.0 million for a total notional amount of $110.0 million . The Company will receive payments from the counterparty at three-month LIBOR and make payments to the counterparty at fixed rates of 0.94% and 1.06% , respectively, on the $55.0 million notional amounts of each derivative contract. The cash flow payments on the derivatives began April 2016 and terminate October 2017 for the 0.94% interest rate swap and began April 2016 and terminate October 2018 for the 1.06% interest rate swap. During 2014, the Company entered into three delayed interest rate swaps with Counterparty C to manage exposure against the variability in the expected future cash flows attributed to changes in the benchmark interest rate on a portion of its variable-rate debt. The Company entered into these interest rate swap agreements to convert a portion of its forecasted variable-rate debt to a fixed rate, which is a cash flow hedge of a forecasted transaction. The total notional amount of the three derivative contracts is $165.0 million . During 2014, the Company terminated its cash flow hedge with Counterparty A, which the Company had entered into in 2012, as internal forecasts for future interest rates changed since this transaction was initiated. The total notional amount of the derivative contract was $115.0 million . The termination of the cash flow hedge resulted in a loss of $8.0 million which had been reflected in the Company’s operating cash flows and will be reclassified from accumulated other comprehensive income (loss) to net income as interest expense as it is amortized over a multi-year period consistent with the original maturity dates of the hedge which began in January 2015 and terminates in January 2022. The Company entered into a delayed interest rate swap with Counterparty B in 2013 to manage exposure against the variability in the expected future cash flows attributed to changes in the benchmark interest rate on a portion of its variable-rate debt. The Company entered into this interest rate swap agreement to convert a portion of its variable-rate debt to a fixed rate, which is a cash flow hedge of a forecasted transaction. The total notional amount of the derivative contract is $150.0 million . A summary of the Company's interest rate swaps as of June 30, 2016 is as follows: (In thousands) Notional Amount Fixed Payment Rate Term Interest rate swaps: Counterparty B: Three-month LIBOR swap $ 150,000 4.165% December 2016 - September 2023 150,000 Counterparty C: Three-month LIBOR swap 55,000 2.652% January 2018 - October 2023 Three-month LIBOR swap 55,000 2.753% January 2019 - October 2024 Three-month LIBOR swap 55,000 2.793% July 2019 - April 2025 Three-month LIBOR swap 55,000 0.940% April 2016 - October 2017 Three-month LIBOR swap 55,000 1.060% April 2016 - October 2018 275,000 Total interest rate swaps $ 425,000 Interest Rate-Prime Swaps. In May 2016, the Company terminated one of its interest rate-prime swaps with Counterparty C, which the Company entered into in 2015, as internal forecasts for future interest rates changed since this transaction was initiated. The total notional amount of the derivative contract was $10.0 million . The termination of the cash flow hedge resulted in a gain of $0.3 million which had been reflected in the Company’s operating cash flows and will be reclassified from accumulated other comprehensive income (loss) to net income as interest income as it is accreted over a multi-year period consistent with the original maturity dates of the hedge which began in June 2015 and terminates in March 2021. During 2015, the Company entered into six interest rate-prime swaps with Counterparty C to manage exposure against the variability in the expected future cash flows on the designated Prime, Prime plus 1% , Prime plus 1% floored at 5% , Prime plus 2% , Prime plus 2% actual/365, and Prime plus 2.25% pools of its floating rate loan portfolio. The Company entered into these interest rate-prime swap agreements to hedge the cash flows from these pools of its floating rate loan portfolio, which is expected to offset the variability in the expected future cash flows attributable to the fluctuations in the daily weighted average Wall Street Journal Prime index, which is a cash flow hedge of a forecasted transaction. The Company terminated the Prime plus 2.25% tranche during 2016 (see 2016 interest rate-prime swaps transaction with Counterparty C above). The total notional amount of the contracts is $135.0 million as of June 30, 2016 . The cash flow payments on the derivatives began March 2015 and terminate September 2022. During 2015, the Company terminated two of its interest rate-prime swaps with Counterparty B, which the Company entered into in 2013, as internal forecasts for future interest rates changed since these transactions were initiated. The total notional amount of the derivative contracts was $70.0 million . The termination of the cash flow hedges resulted in a gain of $1.3 million which had been reflected in the Company’s operating cash flows and will be reclassified from accumulated other comprehensive income (loss) to net income as interest income as it is accreted over a multi-year period consistent with the original maturity dates of the hedges which began in September 2013 and terminate in September 2019. During 2013, the Company entered into four interest rate swaps with Counterparty B to manage exposure against the variability in the expected future cash flows on the designated Prime, Prime plus 1% , Prime plus 1% floored at 5% and Prime plus 1% floored at 5.5% pools of its floating rate loan portfolio. The Company entered into the interest rate swap agreements to hedge the cash flows from these pools of its floating rate loan portfolio, which is expected to offset the variability in the expected future cash flows attributable to the fluctuations in the daily weighted average Wall Street Journal Prime index, which is a cash flow hedge of a forecasted transaction. The Company terminated the Prime and Prime plus 1% tranches during 2015 (see 2015 interest rate-prime swaps transaction with Counterparty B above). The total notional amount of the remaining prime hedges is $180.0 million as of June 30, 2016 . The cash flow payments on the derivatives began September 2013 and terminate September 2019. A summary of the Company's interest rate-prime swaps as of June 30, 2016 is as follows: (In thousands) Notional Amount Fixed Rate Term Interest rate-prime swaps: Counterparty B: Prime plus 1% floored at 5% $ 100,000 6.010% September 2013 - September 2019 Prime plus 1% floored at 5.5% 80,000 6.260% September 2013 - September 2019 180,000 Counterparty C: Prime 30,000 4.500% December 2015 - September 2022 Prime plus 1% 40,000 5.490% December 2015 - September 2022 Prime plus 1% floored at 5% 40,000 5.810% March 2015 - March 2021 Prime plus 2% 15,000 6.560% March 2015 - March 2021 Prime plus 2% actual/365 10,000 6.560% March 2015 - March 2021 135,000 Total interest rate-prime swaps $ 315,000 Information pertaining to outstanding derivative instruments is as follows: Derivative Assets Fair Value Derivative Liabilities Fair Value (In thousands) Balance Sheet Location June 30, 2016 December 31, 2015 Balance Sheet Location June 30, 2016 December 31, 2015 Derivatives designated as hedging instruments under ASC Topic 815: Interest rate swaps - Counterparty B Other Assets $ — $ — Other Liabilities $ 31,046 $ 20,613 Interest rate-prime swaps - Counterparty B Other Assets 5,172 3,815 Other Liabilities — — Interest rate swaps - Counterparty C Other Assets — — Other Liabilities 13,311 3,037 Interest rate-prime swaps - Counterparty C Other Assets 5,596 541 Other Liabilities — 406 $ 10,768 $ 4,356 $ 44,357 $ 24,056 The Company entered into master netting arrangements with both Counterparty B and Counterparty C whereby the delayed interest rate swaps and hedges would be settled net. Net fair values of the Counterparty B and Counterparty C delayed interest rate swaps and hedges as of June 30, 2016 and December 31, 2015 were as follows: June 30, 2016 Gross Amounts Presented in the Balance Sheet Gross Amounts Not Offset in the Balance Sheet (In thousands) Derivatives Collateral Net Derivatives subject to master netting arrangements: Derivative liabilities: Counterparty B $ 25,874 $ — $ — $ 25,874 Counterparty C 7,715 — — 7,715 Net derivative liability $ 33,589 $ — $ — $ 33,589 December 31, 2015 Gross Amounts Presented in the Balance Sheet Gross Amounts Not Offset in the Balance Sheet (In thousands) Derivatives Collateral Net Derivatives subject to master netting arrangements: Derivative liabilities: Counterparty B $ 16,798 $ — $ — $ 16,798 Counterparty C 2,902 — — 2,902 Net derivative liability $ 19,700 $ — $ — $ 19,700 Pursuant to the interest rate swap agreements described above with Counterparty B, the Company pledged collateral in the form of investment securities totaling $28.7 million (with a fair value at June 30, 2016 of $29.7 million ), which has been presented gross in the Company’s balance sheet. Pursuant to the interest rate swap agreements described above with Counterparty C, the Company pledged collateral in the form of investment securities totaling $6.2 million (with a fair value at June 30, 2016 of $6.7 million ), which has been presented gross in the Company’s balance sheet. There was no collateral posted from the counterparties to the Company as of June 30, 2016 . As a result of the discontinuance of the cash flow hedge with Counterparty A, the Company reclassified $0.3 million from accumulated other comprehensive income (loss) into interest expense for the three month periods ended June 30, 2016 and 2015. For the six month periods ended June 30, 2016 and 2015, the Company reclassified $0.6 million and $0.5 million , respectively, from accumulated other comprehensive income (loss) into interest expense. As a result of the discontinuance of the cash flow hedge with Counterparty B, the Company reclassified $0.1 million from accumulated other comprehensive income (loss) into interest income for the three month period ended June 30, 2016 . For the six month period ended June 30, 2016 , the Company reclassified $0.2 million from accumulated other comprehensive income (loss) into interest income. No amounts were reclassified into earnings for the three and six month periods ended June 30, 2015 . There were no amounts reclassified for the three and six month periods ended June 30, 2016 and 2015 from accumulated other comprehensive income (loss) into interest income as a result of the discontinuance of the cash flow hedges with Counterparty C. As of June 30, 2016 and 2015 , no amounts of gains or losses have been reclassified from accumulated comprehensive income (loss), nor have any amounts of gains or losses been recognized due to ineffectiveness of a portion of the derivatives. At June 30, 2016 , no amount of the derivatives will mature within the next 12 months. The Company does not expect to reclassify any amount from accumulated other comprehensive income (loss) into interest income over the next 12 months for derivatives that will be settled. At June 30, 2016 and 2015 , and for the six months then ended, information pertaining to the effect of the hedging instruments on the consolidated financial statements is as follows: Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion) (In thousands) As of June 30, Derivatives in ASC Topic 815 Cash Flow Hedging Relationships: 2016 2015 Interest rate swap with Counterparty A $ (4,124 ) $ (4,844 ) Interest rate swap and prime swaps with Counterparty B (16,120 ) (7,592 ) Interest rate swap and prime swaps with Counterparty C (4,848 ) 944 Total $ (25,092 ) $ (11,492 )

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The income tax benefit on the statement of income for the three and six months ended June 30, 2016 and 2015 was as follows: For the Three Months Ended For the Six Months Ended (In thousands) 2016 2015 2016 2015 (Restated) (Restated) Current tax expense $ 293 $ 831 $ 1,134 $ 1,911 Deferred tax benefit (4,343 ) (19,427 ) (45,054 ) (35,191 ) Total tax benefit $ (4,050 ) $ (18,596 ) $ (43,920 ) $ (33,280 ) The amount of taxes in the accompanying consolidated statements of income is different from the expected amount using statutory federal income tax rates primarily due to the effect of various tax credits. As discussed in Note 6, the Company earns Federal NMTC, Federal Historic Rehabilitation, and Low-Income Housing tax credits, which reduce the Company’s federal income tax liability or create a carryforward as applicable. The Company uses the flow-through method to account for investment tax credits earned on eligible Federal tax credit investments. Under this method, the investment tax credits are recognized as a reduction of income tax expense. The Company is also required to reduce its tax basis of the investment in certain of the projects that generated the Federal NMTC or Federal Historic Rehabilitation tax credits by the amount of the credit generated in that year. The Company recorded a valuation allowance of $1.6 million for the net deferred tax assets at June 30, 2016 and $1.5 million at December 31, 2015. In determining whether a valuation allowance related to deferred tax assets was necessary, the Company considered all available evidence including historical information supplemented by all currently available information about future years. The Company also considered events occurring subsequent to June 30, 2016 but before the financial statements were released that provided additional evidence (negative or positive) regarding the likelihood of realization of existing deferred tax assets. The negative evidence cited included cumulative losses in recent years which included all "non-recurring" charges such as impairments or losses on certain assets that had not occurred previously. Certain of these items may not be indicative of future results, but they are part of total results, and therefore similar types of items may occur in future years. Considerable judgment is required in assessing the need for a valuation allowance including all available evidence, both positive and negative, as the assessment includes determining the feasibility and willingness of the Company to employ various tax planning strategies and projections of future taxable income. Management employed various stress test techniques when evaluating the reasonableness of their estimates, including future taxable income, deferring to scenarios deemed to be mostly likely and supportable by the available data.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation Matters On May 5, 2016, a purported securities class action suit was commenced in the United States District Court for the Eastern District of Louisiana, naming as defendants the Company, its Chairman and Chief Executive Officer, and its Chief Financial Officer. The lawsuit alleges violations of the Securities Exchange Act of 1934 and Rule 10b-5 in connection with allegedly false and misleading statements made by the Company related to its tax credit accounting practices and exposure to the oil and gas industry. The plaintiff seeks, among other things, damages for purchasers of the Company's common stock between May 10, 2013 and April 8, 2016. A group of institutional investors and a pension fund have each moved for appointment as lead plaintiff of the putative class. Briefing on the lead plaintiff motions was completed on July 19, 2016, and the parties currently await a decision on these motions from the Court. The Company believes that it has meritorious defenses and intends to defend this lawsuit vigorously. This lawsuit and any other related lawsuits are subject to inherent uncertainties, and the ultimate outcome of such litigation is necessarily unknown. The Company is unable to make a reasonable estimate of the amount or range of loss that could result from an unfavorable outcome in such matters. The SEC has commenced an investigation relating to the Company’s financial reporting. The Company is fully cooperating with the SEC. The Company cannot predict the duration or outcome of this investigation. Any action by the SEC or other government agency could result in civil or criminal sanctions against the Company and/or certain of its current or former officers, directors or employees. The Company is party to various other litigation matters incidental to the conduct of its business. Based upon its evaluation of information currently available, the Company believes that the ultimate resolution of any such proceedings will not have a material adverse effect, either individually or in the aggregate, on its financial condition, results of operations or cash flows. Off-Balance Sheet Arrangements The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These transactions include commitments to extend credit in the ordinary course of business to approved customers. Generally, loan commitments have been granted on a temporary basis for working capital or commercial real estate financing requirements or may be reflective of loans in various stages of funding. These commitments are recorded on the Company’s financial statements as they are funded. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Loan commitments include unused commitments for open-end lines secured by one to four family residential properties and commercial properties, commitments to fund loans secured by commercial real estate, construction loans, business lines of credit, and other unused commitments. Standby letters of credit are written conditional commitments issued by the Company to guarantee the performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment is funded, the Company would be entitled to seek recovery from the customer. The Company minimizes its exposure to loss under loan commitments and standby letters of credit by subjecting them to credit approval and monitoring procedures. The effect on the Company’s revenues, expenses, cash flows, and liquidity of the unused portions of these commitments cannot be reasonably predicted because there is no guarantee that the lines of credit will be used. The reserve for losses on unfunded commitments totaled $0.3 million at June 30, 2016 and December 31, 2015 . The following is a summary of the total notional amount of loan commitments and standby letters of credit outstanding at June 30, 2016 and December 31, 2015 : (In thousands) June 30, 2016 December 31, 2015 Standby letters of credit $ 140,668 $ 106,232 Unused loan commitments 717,682 715,759 Total $ 858,350 $ 821,991

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Changes in accumulated other comprehensive income (loss) by component are presented in the following table: (In thousands) Cash Flow Terminated Cash Flow Hedges(2) Transfers of Available Total Balance at January 1, 2016 $ (12,806 ) $ (3,685 ) $ (2,926 ) $ (1,968 ) $ (21,385 ) Other comprehensive income (loss) before income taxes: Net change in unrealized gain (loss) (13,889 ) 263 — 7,102 (6,524 ) Reclassification of net losses realized and included in earnings — 394 — — 394 Amortization of unrealized net gain — — 303 — 303 Income tax expense (benefit) (4,769 ) 138 106 2,484 (2,041 ) Balance at June 30, 2016 $ (21,926 ) $ (3,166 ) $ (2,729 ) $ 2,650 $ (25,171 ) (In thousands) Cash Flow Hedges(1) Terminated Cash Flow Hedge(2) Transfers of Available for Sale Securities to Held to Maturity Available for Sale Securities Total Balance at January 1, 2015 $ (8,396 ) $ (5,194 ) $ (3,354 ) $ (2,793 ) $ (19,737 ) Other comprehensive income (loss) before income taxes: Net change in unrealized gain 2,690 — — 472 3,162 Reclassification of net losses realized and included in earnings — 539 — — 539 Amortization of unrealized net gain — — 288 — 288 Income tax expense (benefit) 942 189 101 165 1,397 Balance at June 30, 2015 $ (6,648 ) $ (4,844 ) $ (3,167 ) $ (2,486 ) $ (17,145 ) (1) Balances represent the net operating changes in all of the Company's cash flow hedge relationships as of the dates stated. (2) Balances represent the net unrealized gains (loss) at termination of a certain cash flow hedge, interest rate swap cash flow hedge, and interest rate-prime swap cash flow hedge relationships. See Note 9 for further explanation on the terminated cash flow hedges.

Capital Requirements and Other

Capital Requirements and Other Regulatory Matters	6 Months Ended
	Jun. 30, 2016
Banking and Thrift [Abstract]
Capital Requirements and Other Regulatory Matters	Capital Requirements and Other Regulatory Matters The Company and the Bank are subject to various regulatory capital requirements administered by federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the consolidated financial statements of the Company and the Bank. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance sheet items. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of total and Tier 1 capital to risk-weighted assets, Tier 1 capital to average assets, and common equity Tier 1 capital to risk-weighted assets. Management believes, as of June 30, 2016 and December 31, 2015 , that the Company and the Bank met all minimum capital adequacy requirements to which they were subject. As of June 30, 2016 , the Bank was classified as “adequately capitalized” for purposes of the FDIC's prompt corrective action requirements. To be categorized as "well capitalized", an institution must maintain minimum total risk-based, Tier 1 risk-based, Tier 1 leverage, and common equity Tier 1 risk-based capital ratios as set forth in the following table. There are no conditions or events since the notification that management believes have changed that categorization. Section 29 of the Federal Deposit Insurance Act limits the use of brokered deposits by institutions that are less than “well-capitalized” and allows the FDIC to place restrictions on interest rates that institutions may pay. The following tables present the actual capital amounts and regulatory capital ratios for the Company and the Bank as of June 30, 2016 and December 31, 2015 : June 30, 2016 "Well Capitalized" Minimums Actual (In thousands) Ratio Amount First NBC Bank Holding Company Tier 1 leverage capital 5.97 % $ 281,298 Tier 1 risk-based capital 6.41 % 281,298 Total risk-based capital 9.03 % 396,079 Common equity tier 1 risk-based capital 6.41 % 281,298 First NBC Bank Tier 1 leverage capital 5.00 % 7.26 % $ 340,612 Tier 1 risk-based capital 8.00 % 7.78 % 340,612 Total risk-based capital 10.00 % 9.05 % 396,439 Common equity tier 1 risk-based capital 6.50 % 7.78 % 340,612 December 31, 2015 "Well Capitalized" Minimums Actual (In thousands) Ratio Amount First NBC Bank Holding Company Tier 1 leverage capital 6.03 % $ 265,191 Tier 1 risk-based capital 6.33 % 265,191 Total risk-based capital 9.04 % 378,815 Common equity tier 1 risk-based capital 6.33 % 265,191 First NBC Bank Tier 1 leverage capital 5.00 % 7.44 % $ 321,346 Tier 1 risk-based capital 8.00 % 7.68 % 321,346 Total risk-based capital 10.00 % 8.96 % 374,976 Common equity tier 1 risk-based capital 6.50 % 7.68 % 321,346 On October 11, 2016, the holding company was informed in writing by the Federal Reserve Bank of Atlanta (“FRB”) and Louisiana Office of Financial Institutions (“OFI”) that it is deemed to be in “troubled condition” under Section 225.71 of Regulation Y. This regulatory designation results in two primary limitations upon the holding company. First, the Company will be required to seek the prior approval of the FRB before adding any new director or senior executive officer at the holding company level or changing the responsibilities of any current senior executive officer. Second, the Company may not make indemnification or severance payments to, or enter into agreements providing for such indemnification or severance payments with, institution-affiliated parties, which include key employees and directors of the Company, without complying with certain statutory restrictions including prior approval of the FRB and FDIC. The FRB has also advised the Company that in light of its obligation to serve as a source of financial and managerial strength to the Bank, the Company should not incur indebtedness; distribute any interest, principal or other sums on subordinate debentures; declare or pay dividends on any of the Company’s equity securities; redeem any corporate stock; or make any other payment representing a reduction in capital, except for the payment of normal and routine operating expenses, without prior FRB and OFI approval.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments ASC 820, Fair Value Measurements and Disclosures, clarifies the principle that fair value should be based on the assumptions that market participants would use when pricing the asset or liability and establishes a fair value hierarchy that prioritizes the inputs used to develop those assumptions and measure fair value. The hierarchy requires companies to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: • Level 1 – Quoted prices in active markets for identical assets or liabilities. • Level 2 – Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies, and similar techniques that use significant unobservable inputs. A description of the valuation methodologies used for instruments measured at fair value follows, as well as the classification of such instruments within the valuation hierarchy. Securities are classified within Level 1 when quoted market prices are available in an active market. Inputs include securities that have quoted prices in active markets for identical assets. If quoted market prices are unavailable, fair value is estimated using pricing models or quoted prices of securities with similar characteristics, at which point the securities would be classified within Level 2 of the hierarchy. Examples include certain available for sale securities. The Company’s investment portfolio did not include Level 3 securities as of June 30, 2016 and December 31, 2015 . The Company has segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy, based on the inputs used to determine the fair value at the measurement date in the tables below: June 30, 2016 Fair Value Measurement Using (In thousands) Total Quoted Prices in Active Markets for Identical Assets ( Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale securities: U.S. government agency securities $ 149,449 $ — $ 149,449 $ — U.S. Treasury securities 13,128 — 13,128 — Municipal securities 12,127 — 12,127 — Mortgage-backed securities 118,507 — 118,507 — Corporate bonds 8,048 — 8,048 — Other equity securities 20 20 — — Total $ 301,279 $ 20 $ 301,259 $ — Liabilities Derivative instruments $ 33,589 $ — $ 33,589 $ — December 31, 2015 Fair Value Measurement Using (In thousands) Total Quoted Prices in Active Markets for Identical Assets ( Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale securities: U.S. government agency securities $ 149,675 $ — $ 149,675 $ — U.S. Treasury securities 12,703 — 12,703 — Municipal securities 12,100 — 12,100 — Mortgage-backed securities 77,511 — 77,511 — Corporate bonds 7,823 — 7,823 — Other equity securities 20 20 — — Other debt securities 25,994 — 25,994 — Total $ 285,826 $ 20 $ 285,806 $ — Liabilities Derivative instruments $ 19,700 $ — $ 19,700 $ — The Company has segregated all financial assets and liabilities that are measured at fair value on a nonrecurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below: June 30, 2016 Fair Value Measurement Using (In thousands) Total Quoted Prices in Active Markets for Identical Assets ( Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Loans $ 147,957 $ — $ — $ 147,957 OREO 2,460 — — 2,460 Investment in tax credit entities 6,233 — — 6,233 $ 156,650 $ — $ — $ 156,650 December 31, 2015 Fair Value Measurement Using (In thousands) Total Quoted Prices in Active Markets for Identical Assets ( Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Loans $ 134,755 $ — $ — $ 134,755 OREO 3,701 — — 3,701 Investment in tax credit entities 1,425 — — 1,425 $ 139,881 $ — $ — $ 139,881 In accordance with ASC Topic 310, the Company records loans and other real estate considered impaired at the lower of cost or fair value. Impaired loans, recorded at fair value, are Level 3 assets measured using appraisals from external parties of the collateral, less any prior liens primarily using the market or income approach. The residual value or fair value of the Company's investment in tax credit entities are Level 3 assets measured using appraisals or actual costs incurred on the underlying individual properties, applying an estimated inflation rate on the appraised values or actual costs and discounting the cash flows. The Company did not record any liabilities at fair value for which measurement of the fair value was made on a nonrecurring basis during the six months ended June 30, 2016 or the year ended December 31, 2015 . ASC 820 requires the disclosure of the fair value for each class of financial instruments for which it is practicable to estimate. The fair value of a financial instrument is the current amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. ASC 820 excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company. The following methods and assumptions were used to estimate the fair value of each class of financial instrument for which it is practicable to estimate that value. Cash and Cash Equivalents The carrying amounts of these short-term instruments approximate their fair values and would be classified within Level 1 of the hierarchy. Investment in Short-Term Receivables The carrying amounts of these short-term receivables approximate their fair value and would be classified within Level 1 of the hierarchy. Investment Securities Securities are classified within Level 1 where quoted market prices are available in the active market. If quoted market prices are unavailable, fair value is estimated using pricing models or quoted prices of securities with similar characteristics, at which point the securities would be classified within Level 2 of the hierarchy. Inputs include securities that have quoted prices in active markets for identical assets. Loans For variable-rate loans that reprice frequently and have no significant change in credit risk, fair values are based on carrying values. Fair values for fixed-rate commercial real estate, commercial loans, and consumer loans are estimated using discounted cash flow analyses using interest rates currently being offered for loans with similar terms and borrowers of similar credit quality. Fair value of mortgage loans held for sale is based on commitments on hand from investors or prevailing market rates. The fair value associated with the loans includes estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows, which would be classified as Level 3 of the hierarchy. Deposits The fair values disclosed for demand deposits are, by definition, equal to the amount payable on demand at the reporting date (that is, their carrying amounts) and would be categorized within Level 2 of the fair value hierarchy. The carrying amounts of variable-rate, fixed-term money market accounts approximate their fair values at the reporting date. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits. The fair value of the Company’s interest-bearing deposits would, therefore, be categorized within Level 3 of the fair value hierarchy. Short-Term Borrowings and Repurchase Agreements The carrying amounts of these short-term instruments approximate their fair values and would be classified within Level 2 of the hierarchy. Long-Term Borrowings The fair values of long-term borrowings are estimated using discounted cash flows analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. The fair value of the Company’s long-term debt would, therefore, be categorized within Level 2 of the fair value hierarchy. Derivative Instruments Fair values for interest rate swap agreements are based upon the amounts required to settle the contracts. The derivative instruments are classified within Level 2 of the fair value hierarchy. The estimated fair values of the Company’s financial instruments were as follows as of the dates indicated: Fair Value Measurements at June 30, 2016 (In thousands) Carrying Amount Total Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents $ 146,011 $ 146,011 $ 146,011 $ — $ — Investment securities available for sale 301,279 301,279 20 301,259 — Investment securities held to maturity 79,598 85,442 — 85,442 — Loans and loans held for sale 3,783,183 3,766,902 — — 3,766,902 Financial Liabilities: Deposits, noninterest-bearing 381,553 381,553 — 381,553 — Deposits, interest-bearing 3,550,471 3,543,587 — — 3,543,587 Repurchase agreements 85,757 85,757 — 85,757 — Short-term borrowings 7,022 7,027 — 7,027 — Long-term borrowings 355,130 360,921 — 360,921 — Derivative instruments 33,589 33,589 — 33,589 — Fair Value Measurements at December 31, 2015 (In thousands) Carrying Amount Total Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 349,054 $ 349,054 $ 349,054 $ — $ — Investment in short-term receivables 25,604 25,604 25,604 — — Investment securities available for sale 285,826 285,826 20 285,806 — Investment securities held to maturity 82,074 82,799 — 82,799 — Loans and loans held for sale 3,466,268 3,444,920 — — 3,444,920 Financial Liabilities: Deposits, noninterest-bearing 368,421 368,421 — 368,421 — Deposits, interest-bearing 3,475,421 3,403,261 — — 3,403,261 Repurchase agreements 79,251 79,251 — 79,251 — Short-term borrowings 8,000 7,994 — 7,994 — Long-term borrowings 339,042 341,033 — 341,033 — Derivative instruments 19,700 19,700 — 19,700 —

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations The Company is a bank holding company that offers a broad range of financial services through First NBC Bank (Bank), a Louisiana state non-member bank, to businesses, institutions, and individuals in southeastern Louisiana and the Florida panhandle. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States and to prevailing practices within the banking industry.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of the Company and the Bank, and First NBC Bank’s wholly owned subsidiaries, which include First NBC Community Development, LLC (FNBC CDC), First NBC Community Development Fund, LLC (FNBC CDE) (collectively referred to as the Bank) and any variable interest entities of which the Company is the primary beneficiary. Substantially all of the variable interest entities (VIE) for which the Company is the primary beneficiary relate to tax credit investments. FNBC CDC is a Community Development Corporation formed to construct, purchase, and renovate affordable residential real estate properties in the New Orleans area. FNBC CDE is a Community Development Entity (CDE) formed to apply for and receive allocations of Federal New Markets Tax Credits (NMTC).
Investments in Tax Credit Entities	Investments in Tax Credit Entities As part of its Community Reinvestment Act responsibilities and due to their favorable economics, the Company invests in tax credit-motivated projects. These projects produce tax credits issued under Federal Low-Income Housing, Federal Historic Rehabilitation, and Federal New Markets Tax Credits (Federal NMTC) programs. The Company generates its returns on tax credit motivated projects through the receipt of federal, and if applicable, state tax credits as well as equity returns. The federal tax credits are recorded as an offset to the income tax provision in the year that they are earned under federal income tax law – over 10 to 15 years, beginning in the year in which rental activity commences for Federal Low-Income Housing credits, in the year of the issuance of the certificate of occupancy and the property being placed into service for Federal Historic Rehabilitation credits, and over 7 years for Federal NMTC upon the investment of funds into the CDE. These credits, if not used in the tax return for the year of origination, can be carried forward for 20 years. The state credits are recorded in income when earned (usually when the project is placed in service) and sold to investors since the Company pays minimal state income taxes under Louisiana tax law. The Company invests in projects generating Federal Low-Income Housing credits, by investing in a tax credit entity, usually a limited liability company, which owns the real estate. The Company receives a 99.99% nonvoting interest in the entity that must be retained during the compliance period for the credits ( 15 years). Control of the tax credit entity rests in the .01% interest general partner, who has the power and authority to make decisions that impact economic performance of the project and is required to oversee and manage the project. The Company accounts for its investment in Federal Low-Income Housing credits utilizing the equity method of accounting. The Company begins to evaluate its investment for impairment at the time the tax credits are earned through the end of the 15 year compliance period. The Company evaluates its investment at the end of each reporting period for impairment and any residual returns are expected to be minor. For Federal Historic Rehabilitation credits, the Company invests in a tax credit entity, usually a limited liability company, which owns the real estate or a master tenant structure. In some cases, the Company receives a 99% nonvoting interest in the tax credit entity that must be retained during the compliance period for the credits ( 5 years). In some instances, the Company invests 99% in a pass through entity called a master tenant, which maintains an ownership interest in a limited liability company which owns the real estate. In most cases, the Company’s interest in the entity (in either structure) is generally reduced from a 99% interest to a 0% to 25% interest at the end of the compliance period. Control of the tax credit entity rests in the 1% interest general partner (in either structure), who has the power and authority to make decisions that impact economic performance of the project and is required to oversee and manage the project. The Company accounts for its investment in Federal Historic Rehabilitation credits utilizing the equity method of accounting. The Company begins to evaluate its investment for impairment at the time the credit is earned, which is typically in the year the project is placed in service, through the end of its compliance period. The Company evaluates its investment at the end of each reporting period for impairment and any expected residual returns reduce the amount of impairment recognized. For Federal NMTC, a different structure is required by federal tax law. In order to distribute Federal NMTC, the federal government allocates such credits to CDEs. The Company invests in both CDEs formed by unaffiliated parties and in CDEs formed by the Company. Projects must be commercial or real estate operations and are qualified by their location in low- income areas or by their employment of, or service to, low-income citizens. A CDE, in most cases, creates a special-purpose subsidiary for each project through which the credits are allocated and through which the proceeds from the tax credit investor and a leverage lender, if applicable, flow through to the project, which in turn generate the credit. The credits are calculated at 39% of the total CDE allocation to the project at the rate of 5% for the first three years and 6% for the next four years. Federal tax law requires special terms benefiting the qualified project, which can include below-market interest rates. The Company evaluates its investment for impairment under the equity method of accounting at the end of each reporting period, beginning at the time the tax credits are earned on the project through the end of the seven -year compliance period, and any residual returns are expected to be minor. When the Company also has a loan to the project, it is reported as a loan in the consolidated balance sheet, as the Company has credit exposure to the project and the loan is repaid at the end of the compliance period. In general, the debt has no principal payments during the compliance period but the Company may require the project to fund a sinking fund over the compliance period to achieve the same risk reduction effect as if principal is being amortized. When the Company is the tax credit investor in a CDE formed by an unaffiliated party, it has no control of the applicable CDE or the CDE’s special-purpose subsidiary. For projects which are funded through FNBC CDE, the Company consolidates its CDE and the specifically formed special-purpose entities since it maintains control over these entities; however, the Company does not have control over the entity which oversees the project. As part of the activities of FNBC CDE, the Company makes investments in the CDE for purposes of providing equity to the projects sponsored by the FNBC CDE. When a project is funded through FNBC CDE, the CDE will receive a CDE management fee at the time of the project's closing of approximately 4% and an annual fee of 0.5% of the qualified equity investment in the project. The annual fee is received until the end of the Federal NMTC compliance period. The CDE management fee earned is recorded in the consolidated statement of income as a component of noninterest income. The Company may pay a fee to the CDE when the project is funded through a CDE other than FNBC CDE at the time of a project's closing and annually during the compliance period for the allocation of the credits. The fee is recorded as a component of noninterest expense in the Company's consolidated statement of income over the Federal NMTC compliance period. The Company has the risk of credit recapture if the project fails during the compliance period for Federal Low-Income Housing and Federal Historic Rehabilitation transactions. For Federal NMTC transactions, the risk of credit recapture exists if investment requirements are not maintained during the compliance period. The risk of recapture for Federal NMTC transactions when the project is funded by FNBC CDE is described in Note 6. Such events, although rare, are accounted for when they occur and no such events have occurred to date involving FNBC CDE.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are susceptible to a significant change in the near term are the allowance for loan losses, income tax provision, fair value adjustments, impairment on tax credit investments, and share-based compensation.
Concentration of Credit Risk	Concentration of Credit Risk The Company’s loan portfolio consists of the various types of loans described in Note 5. Real estate or other assets secure most loans. The majority of these loans have been made to individuals and businesses in the Company’s market area of southeastern Louisiana and the Florida panhandle, which are dependent on the area economy for their livelihoods and servicing of their loan obligations. The Company does not have any significant concentrations to any one industry or customer. The Company maintains deposits in other financial institutions that may, from time to time, exceed the federally insured deposit limits.
Reclassifications	Reclassifications Some amounts previously reported have been adjusted to reflect certain reclassification adjustments to conform to the current period presentation. These include reclassifications of amounts previously reported in occupancy and equipment expenses to rental property expenses. The Company has presented rental property expenses, previously presented as a component of other noninterest expense in its consolidated statements of income, and rental property income, previously presented as a component of other noninterest income in its consolidated statements of income, as separate components on its consolidated statements of income.
Recent Accounting Pronouncements	Recent Accounting Pronouncements ASU No. 2014-09 and 2015-14 In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 205): An Amendment of the FASB Accounting Standards Codification , which clarifies the principles for recognizing revenue from contracts with customers. The new accounting guidance, which does not apply to financial instruments, clarifies that an entity should recognize 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. As part of that principle, the entity should identify the contract(s) with the customer, identify the performance obligation(s) of the contract, determine the transaction price, allocate that transaction price to the performance obligation(s) of the contract, and then recognize revenue when or as the entity satisfies the performance obligation(s). In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date , which deferred the original effective date declared in ASU No. 2014-09 by one year. Accordingly, the amendments in ASU No. 2014-09 will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that annual reporting period. The amendments will be applied through the election of one of two retrospective methods. The Company is in the process of evaluating the new guidance and its impact on the Company's financial condition or results of operations. ASU No. 2014-15 In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern , which will require management to assess an entity’s ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards in connection with preparing financial statements for each annual and interim reporting period. The new accounting guidance is for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter, with early application permitted. The Company does not expect the new guidance to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-01 In January 2016, the FASB issued ASU No. 2016-01, Financial Instrument-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , which (1) requires equity investments to be measured at fair value with changes in fair value recognized in net income, (2) simplifies the impairment assessment of equity investments with readily determinable fair values by requiring a qualitative assessment to identify impairment, (3) eliminates the requirement to disclose the fair value instruments measured at amortized cost for entities that are not public business entities, (4) eliminates the requirement for public business entities to disclose the method and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (5) requires public business entities to use the exit price notion when measuring fair value of financial instruments for disclosure purposes, (6) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (7) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements, and (8) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity's other deferred tax assets. The new accounting guidance is for the annual period beginning after December 15, 2017, including interim periods. The Company does not expect the new guidance to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-02 In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires lessees to recognize a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term for all leases (with the exception of short-term leases) at the commencement date. The new lease guidance simplified the accounting for sale and leaseback transactions primarily because lessees must recognize lease assets and lease liabilities. Lessees will no longer be provided with a source of off-balance sheet financing. The guidance is for fiscal years beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. Early application is permitted for all entities upon issuance. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. The Company is currently evaluating the provisions of the ASU to determine the potential impact the new standard will have on the Company's financial condition or results of operations. ASU No. 2016-05 In March 2016, the FASB issued ASU 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, which clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument does not, in and of itself, require de-designation of that hedging relationship. The amendments apply to all reporting entities for which there is a change in the counterparty to a derivative instrument that has been designated as a hedging instrument. The amendments are effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The amendments may be applied on either a prospective basis or a modified retrospective basis. The adoption of this guidance is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-06 In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments, that requires embedded derivatives to be separated from the host contract and accounted for separately as derivatives if certain criteria are met. The amendments apply to all entities that are issuers of or investors in debt instruments (or hybrid financial instruments that are determined to have a debt host) with embedded call (put) options. The amendments clarify what steps are required when assessing whether the economic characteristics and risks or call (put) options are clearly and closely related to the economic characteristics and risks of their debt hosts, which is one of the criteria for bifurcating an embedded derivative. Consequently, when a call (put) option is contingently exercisable, an entity does not have to assess whether the event triggers the ability to exercise a call (put) option is related to interest rates or credit risks. Public business entities must apply the new requirements for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-07 In March 2016, the FASB issued ASU 2016-07, Investments- Equity Method and Joint Ventures (Topic 323), which simplifies the transition to the equity method of accounting. The amendments affect all entities that have an investment that becomes qualified for the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The amendments require that an entity that has an available for sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. The amendments are effective for all entities for fiscal years beginning after December 15, 2016. The adoption of this guidance is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-08 In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), that improves the operability and understandibility of the implementation guidance on principal versus agent considerations. The amendments relate to when another party, along with the entity, is involved in providing a good or service to a customer. It requires an entity to determine whether the nature of its promise is to provide that good or service to the customer (i.e., the entity is a principal) or to arrange for the good or service to be provided to the customer by the other party (i.e., the entity is an agent). Public entities should apply the amendments for annual reporting periods beginning after December 15, 2017. The adoption of this guidance is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-09 In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, to improve the accounting for employee share-based payments. Several aspects of the accounting for share-based payment award transactions are simplified, including income tax consequences; classification of awards as either equity or liabilities; and classification on the statement of cash flows. The amendments are effective for public business entities for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted for any interim or annual period. The Company is currently assessing the pronouncement and the impact of adoption. ASU No. 2016-10 In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, that clarifies the identification of performance obligations and licensing from revenue from contracts with customers. The amendments help determine the whether promises to transfer goods or services to a customer are separately identifiable by emphasizing that an entity determines whether the nature of its promise in the contract is to transfer each of the goods or services or whether the promise is to transfer a combined item (or items) to which promised goods and/or services are inputs. In addition, the amendments clarify how to determine whether an entity's promise to grant a license provides a customer with either a right to use the entity's intellectual property or a right to access the entity's intellectual property. Public entities should apply the amendments for annual reporting periods beginning after December 15, 2017, including interim reporting periods therein. Early application for public entities is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is currently assessing this pronouncement and adoption of this guidance, but it is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-12 In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients , which is intended to improve implementation guidance on certain narrow aspects of Topic 606. The amendments in this ASU: • Clarify how an entity assesses the collectability criterion in Step 1 of Topic 606; • Permit, as an accounting policy election, entities to exclude from the transaction price amounts collected from customers for all sales (and other similar) taxes; • Specify the measurement date of noncash consideration as the date of contract inception; • Clarify when a contract is considered completed for purposes of transition of Topic 606; and • Clarify that an entity that retrospectively applies the guidance in Topic 606 to each prior reporting period is not required to disclose the effect of the accounting change for the period of adoption. However, an entity is still required to disclose the effect of the changes on any prior periods retrospectively adjusted. Public entities should apply the amendments for annual reporting periods beginning after December 15, 2017, including interim reporting periods therein. Early application for public entities is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is currently assessing this pronouncement and adoption of this guidance, but it is not expected to have a material impact on the Company's financial condition or results of operations. ASU No. 2016-13 In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The ASU, more commonly referred to as Current Expected Credit Losses, or CECL, requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. Public entities should apply the amendments for annual reporting periods beginning after December 15, 2019, including interim reporting periods therein. Early application for public entities is permitted as of annual reporting periods beginning after December 15, 2018, including interim reporting periods within that reporting period. The Company is currently evaluating the impact of the ASU on the Company’s financial condition or results of operations. ASU No. 2016-15 In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 320): Clarification of Certain Cash Receipts and Cash Payments, to address eight specific cash flow issues with the objective of reducing diversity in practice. The issues identified within the ASU include: debt prepayments or extinguishment costs; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. Public entities should apply the amendments for annual reporting periods beginning after December 15, 2017, including interim reporting periods therein. Early application for public entities is permitted. The Company is currently evaluating the impact of the ASU on the Company’s financial condition or results of operations.

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2016
First National Bank of Crestview
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	(In thousands) Total consideration received $ 10,035 Fair value of assets acquired, including identifiable intangible assets 61,088 Fair value of liabilities assumed 72,314 Goodwill $ 1,191
Schedule of Acquired Assets and Liabilities	The acquired assets and liabilities, as well as the adjustments to record the assets and liabilities at their estimated fair values, are presented in the following tables: First National Bank of Crestview (In thousands) As Acquired Fair Value Adjustments As recorded by First NBC Bank Assets Cash and due from banks $ 1,511 $ — $ 1,511 Short-term investments 19,971 — 19,971 Investment securities-available for sale 9,559 — 9,559 Loans 27,647 (1,203 ) (1) 26,444 Bank premises 3,120 — 3,120 Core deposit intangible — 188 (2) 188 Other assets 455 (160 ) 295 Total Assets $ 62,263 $ (1,175 ) $ 61,088 Liabilities Deposits: Non-interest bearing $ 22,680 $ — $ 22,680 Interest bearing 49,584 16 (3) 49,600 Total deposits 72,264 16 72,280 Other liabilities 34 — 34 Total Liabilities $ 72,298 $ 16 $ 72,314 (1) The amount represents the adjustment of the book value of First National Bank of Crestview's loans to their estimated fair value based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio. (2) The amount represents the estimated fair value of the core deposit intangible asset created in the acquisition. The core deposit intangible asset is being amortized over the estimated useful life of 12 years. (3) The adjustment is necessary because the weighted-average interest rate of First National Bank of Crestview's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment is being amortized to reduce future interest expense over the expected life of the deposits, which is estimated at 49 months .
State-Investors Bank
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	(In thousands) Total consideration paid $ 48,744 Fair value of assets acquired, including identifiable intangible assets 254,080 Fair value of liabilities assumed 213,981 Goodwill $ 8,645
Schedule of Acquired Assets and Liabilities	State Investors Bancorp, Inc. (In thousands) As Acquired Fair Value Adjustments As recorded by First NBC Bank Assets Cash and due from banks $ 20,031 $ — $ 20,031 Short-term investments 12,338 — 12,338 Investment securities-available for sale 27,388 (193 ) (1) 27,195 Loans 182,249 (2,830 ) (2) 179,419 Bank premises and equipment 7,708 592 (3) 8,300 Deferred tax asset 1,004 1,416 (4) 2,420 Core deposit intangible — 468 (5) 468 Other assets 3,909 — 3,909 Total Assets $ 254,627 $ (547 ) $ 254,080 Liabilities Deposits: Noninterest-bearing $ 11,416 $ — $ 11,416 Interest-bearing 141,235 1,245 (6) 142,480 Total deposits 152,651 1,245 153,896 Borrowings 55,913 868 (7) 56,781 Other liabilities 3,304 — 3,304 Total Liabilities $ 211,868 $ 2,113 $ 213,981 (1) The amount represents the adjustment of the book value of SIBC's investments to their estimated fair value based on fair values on the date of acquisition. (2) The amount represents the adjustment of the book value of loans acquired to their estimated fair value based on current interest rates and expected cash flows, which includes estimates of expected credit losses inherent in the portfolio. (3) The amount represents the adjustment of the book value of SIBC's bank premises and equipment to their estimated fair value at the acquisition date based on their appraised value on the date of acquisition. (4) The amount represents the deferred tax asset recognized on the fair value adjustment of SIBC acquired assets and assumed liabilities. (5) The amount represents the estimated fair value of the core deposit intangible asset created in the acquisition. The core deposit intangible asset is being amortized over the estimated useful life of 12 years. (6) The adjustment is necessary because the weighted-average interest rate of SIBC's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment is being amortized to reduce future interest expense over the life of the deposits. (7) The adjustment represents the adjustment of the book value of SIBC's borrowings to their estimated fair value based on current interest rates and the credit characteristics inherent in the liability.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Income Per Common Share	The following sets forth the computation of basic net income per common share and diluted net income per common share: For the Three Months Ended For the Six Months Ended (In thousands, except per share data) 2016 2015 2016 2015 (Restated) (Restated) Basic: Income available to common shareholders $ 3,382 $ 12,388 $ 26,078 $ 22,054 Weighted-average common shares outstanding 19,105 18,620 19,096 18,611 Basic earnings per share $ 0.18 $ 0.67 $ 1.37 $ 1.19 Diluted: Income available to common shareholders $ 3,382 $ 12,388 $ 26,078 $ 22,054 Weighted-average common shares outstanding 19,105 18,620 19,096 18,611 Effect of dilutive securities: Stock options outstanding 154 418 233 401 Restricted shares outstanding — 3 — 2 Warrants 74 124 78 121 Weighted-average common shares outstanding – assuming dilution 19,333 19,165 19,407 19,135 Diluted earnings per share $ 0.18 $ 0.65 $ 1.34 $ 1.15

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Market Values of Investment Securities with Gross Unrealized Gains and Losses	The amortized cost and market values of investment securities, with gross unrealized gains and losses, as of June 30, 2016 and December 31, 2015 , were as follows: June 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Market Value (In thousands) Less Than One Year Greater Than One Year Available for sale: U.S. government agency securities $ 146,702 $ 2,747 $ — $ — $ 149,449 U.S. Treasury securities 13,014 114 — — 13,128 Municipal securities 11,969 158 — — 12,127 Mortgage-backed securities 117,475 1,347 (274 ) (41 ) 118,507 Corporate bonds 8,021 27 — — 8,048 Other equity securities 20 — — — 20 $ 297,201 $ 4,393 $ (274 ) $ (41 ) $ 301,279 Held to maturity: Municipal securities $ 38,162 $ 2,588 $ — $ — $ 40,750 Mortgage-backed securities 41,436 3,274 — (18 ) 44,692 $ 79,598 $ 5,862 $ — $ (18 ) $ 85,442 December 31, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Market Value (In thousands) Less Than One Year Greater Than One Year Available for sale: U.S. government agency securities $ 151,369 $ 552 $ (1,591 ) $ (655 ) $ 149,675 U.S. Treasury securities 13,015 — — (312 ) 12,703 Municipal securities 12,115 76 — (91 ) 12,100 Mortgage-backed securities 78,227 367 (934 ) (149 ) 77,511 Corporate bonds 8,103 — (280 ) — 7,823 Other equity securities 20 — — — 20 Other debt securities 25,994 1 (1 ) — 25,994 $ 288,843 $ 996 $ (2,806 ) $ (1,207 ) $ 285,826 Held to maturity: Municipal securities $ 38,950 $ 1,888 $ — $ (18 ) $ 40,820 Mortgage-backed securities 43,124 674 (196 ) (1,622 ) 41,980 $ 82,074 $ 2,562 $ (196 ) $ (1,640 ) $ 82,800
Summary of Amortized Cost and Estimated Market Values by Contractual Maturity of Investment Securities	The amortized cost and estimated market values by contractual maturity of investment securities as of June 30, 2016 and December 31, 2015 are shown in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2016 December 31, 2015 (In thousands) Weighted Average Yield Amortized Cost Estimated Market Value Weighted Average Yield Amortized Cost Estimated Market Value Available for sale: Due in one year or less 1.91 % $ 84,431 $ 85,284 1.19 % $ 36,599 $ 36,558 Due after one year through five years 1.89 146,155 148,084 1.71 134,275 133,485 Due after five years through ten years 2.44 54,069 55,341 1.88 105,950 104,184 Due after ten years 2.44 12,546 12,570 2.29 12,019 11,599 Total securities 2.00 % $ 297,201 $ 301,279 1.77 % $ 288,843 $ 285,826 Held to maturity: Due in one year or less 9.68 % $ 8,710 $ 8,892 4.90 % $ 3,190 $ 3,068 Due after one year through five years 3.86 40,584 43,409 3.68 36,673 38,371 Due after five years through ten years 3.18 10,423 11,162 3.25 14,416 14,968 Due after ten years 3.67 19,881 21,979 3.44 27,795 26,393 Total securities 3.74 % $ 79,598 $ 85,442 3.57 % $ 82,074 $ 82,800

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Summary of Major Classifications of Loans	Major classifications of loans at June 30, 2016 and December 31, 2015 were as follows: (In thousands) June 30, 2016 December 31, 2015 Commercial real estate loans: Construction $ 548,563 $ 522,269 Mortgage(1) 1,642,719 1,423,545 2,191,282 1,945,814 Consumer real estate loans: Construction 16 9 Mortgage 234,787 264,422 234,803 264,431 Commercial and industrial loans 1,304,952 1,221,283 Loans to individuals, excluding real estate 28,139 21,688 Other loans 20,809 5,377 3,779,985 3,458,593 Less allowance for loan losses (76,964 ) (78,478 ) Loans, net $ 3,703,021 $ 3,380,115 (1) Included in commercial real estate loans, mortgage, are owner-occupied real estate loans of $502.1 million at June 30, 2016 and $449.1 million at December 31, 2015 . These loans were classified in the Company's loan portfolio at June 30, 2016 and December 31, 2015 as follows: (In thousands) June 30, 2016 December 31, 2015 Construction $ 59,110 $ 43,962 Commercial real estate 78,351 67,579 Commercial and industrial 145,201 117,389 Total loans $ 282,662 $ 228,930
Summary of Changes in Allowance for Loan Losses	A summary of changes in the allowance for loan losses during the three and six months ended June 30, 2016 and June 30, 2015 is as follows: Three Months Ended June 30, 2016 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Balance, beginning of period $ 6,706 $ 21,115 $ 5,293 $ 50,746 $ 329 $ 84,189 Charge-offs (25 ) (300 ) (45 ) (505 ) (5 ) (880 ) Recoveries — 9 4 2 5 20 (Recovery) Provision (609 ) 6,260 (1,408 ) (10,627 ) 19 (6,365 ) Balance, end of period $ 6,072 $ 27,084 $ 3,844 $ 39,616 $ 348 $ 76,964 Three Months Ended June 30, 2015 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Balance, beginning of period $ 4,733 $ 16,750 $ 3,316 $ 20,205 $ 191 $ 45,195 Charge-offs (10 ) (501 ) (41 ) (122 ) (24 ) (698 ) Recoveries — 243 2 5 4 254 Provision 628 327 257 4,388 — 5,600 Balance, end of period $ 5,351 $ 16,819 $ 3,534 $ 24,476 $ 171 $ 50,351 Six Months Ended June 30, 2016 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Balance, beginning of period $ 5,027 $ 18,016 $ 3,500 $ 51,736 $ 199 $ 78,478 Charge-offs (25 ) (496 ) (45 ) (9,364 ) (7 ) (9,937 ) Recoveries — 13 4 14 9 40 Provision (Recovery) 1,070 9,551 385 (2,770 ) 147 8,383 Balance, end of period $ 6,072 $ 27,084 $ 3,844 $ 39,616 $ 348 $ 76,964 Six Months Ended June 30, 2015 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Balance, beginning of period $ 4,030 $ 14,965 $ 3,316 $ 19,814 $ 211 $ 42,336 Charge-offs (12 ) (530 ) (41 ) (272 ) (50 ) (905 ) Recoveries — 243 2 66 9 320 Provision 1,333 2,141 257 4,868 1 8,600 Balance, end of period $ 5,351 $ 16,819 $ 3,534 $ 24,476 $ 171 $ 50,351
Summary of Allowance for Loan Losses and Recorded Investment in Loans	The allowance for loan losses and recorded investment in loans, including loans acquired with deteriorated credit quality, as of the dates indicated are as follows: June 30, 2016 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 516 $ 4,722 $ 384 $ 20,433 $ 25 $ 26,080 Collectively evaluated for impairment 5,556 22,362 3,460 19,183 323 50,884 Total $ 6,072 $ 27,084 $ 3,844 $ 39,616 $ 348 $ 76,964 Outstanding loan balances: Individually evaluated for impairment $ 12,704 $ 25,554 $ 6,017 $ 127,311 $ 270 $ 171,856 Collectively evaluated for impairment 535,875 1,617,165 228,770 1,198,450 27,869 3,608,129 Total $ 548,579 $ 1,642,719 $ 234,787 $ 1,325,761 $ 28,139 $ 3,779,985 December 31, 2015 (In thousands) Construction Commercial Real Estate Consumer Real Estate Commercial and Industrial Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 508 $ 5,674 $ 322 $ 40,176 $ 13 $ 46,693 Collectively evaluated for impairment 4,519 12,342 3,178 11,560 186 31,785 Total $ 5,027 $ 18,016 $ 3,500 $ 51,736 $ 199 $ 78,478 Outstanding loan balances: Individually evaluated for impairment $ 2,630 $ 30,007 $ 4,318 $ 119,652 $ 144 $ 156,751 Collectively evaluated for impairment 519,648 1,393,538 260,104 1,107,008 21,544 3,301,842 Total $ 522,278 $ 1,423,545 $ 264,422 $ 1,226,660 $ 21,688 $ 3,458,593
Summary of Credit Quality Indicators on Company's Loan Portfolio	Credit quality indicators on the Company’s loan portfolio, including loans acquired with deteriorated credit quality, as of the dates indicated were as follows: June 30, 2016 (In thousands) Pass and Pass/Watch Special Mention Substandard Doubtful Total Construction $ 451,226 $ — $ 97,353 $ — $ 548,579 Commercial real estate 1,546,679 12,216 83,824 — 1,642,719 Consumer real estate 218,732 5,533 10,522 — 234,787 Commercial and industrial 1,126,209 9,754 170,474 19,324 1,325,761 Consumer 27,779 8 352 — 28,139 Total loans $ 3,370,625 $ 27,511 $ 362,525 $ 19,324 $ 3,779,985 December 31, 2015 (In thousands) Pass and Pass/Watch Special Mention Substandard Doubtful Total Construction $ 444,713 $ — $ 77,565 $ — $ 522,278 Commercial real estate 1,325,513 15,230 82,802 — 1,423,545 Consumer real estate 252,707 175 11,540 — 264,422 Commercial and industrial 1,038,567 7,377 161,391 19,325 1,226,660 Consumer 21,364 13 311 — 21,688 Total loans $ 3,082,864 $ 22,795 $ 333,609 $ 19,325 $ 3,458,593
Age Analysis of Past Due Loans Including Loans Acquired with Deteriorated Credit Quality	An aged analysis of past due loans, including loans acquired with deteriorated credit quality, as of the dates indicated is as follows: June 30, 2016 (In thousands) Greater Than 30 and Fewer Than 90 Days Past Due 90 Days and Greater Past Due Total Past Due Current Loans Total Loans Real estate loans: Construction $ 656 $ 11,375 $ 12,031 $ 536,548 $ 548,579 Commercial real estate 3,941 5,111 9,052 1,633,667 1,642,719 Consumer real estate 3,737 4,547 8,284 226,503 234,787 Total real estate loans 8,334 21,033 29,367 2,396,718 2,426,085 Other loans: Commercial and industrial 4,648 11,411 16,059 1,309,702 1,325,761 Consumer 38 81 119 28,020 28,139 Total other loans 4,686 11,492 16,178 1,337,722 1,353,900 Total loans $ 13,020 $ 32,525 $ 45,545 $ 3,734,440 $ 3,779,985 December 31, 2015 (In thousands) Greater Than 30 and Fewer Than 90 Days Past Due 90 Days and Greater Past Due Total Past Due Current Loans Total Loans Real estate loans: Construction $ 430 $ 981 $ 1,411 $ 520,867 $ 522,278 Commercial real estate 979 5,943 6,922 1,416,623 1,423,545 Consumer real estate 5,628 2,517 8,145 256,277 264,422 Total real estate loans 7,037 9,441 16,478 2,193,767 2,210,245 Other loans: Commercial and industrial 2,018 2,588 4,606 1,222,054 1,226,660 Consumer 385 190 575 21,113 21,688 Total other loans 2,403 2,778 5,181 1,243,167 1,248,348 Total loans $ 9,440 $ 12,219 $ 21,659 $ 3,436,934 $ 3,458,593
Summary of Information Pertaining to Impaired Loans	The following is a summary of information pertaining to impaired loans excluding loans acquired with deteriorated credit quality, as of the periods indicated: June 30, 2016 (In thousands) Recorded Investment Contractual Balance Related Allowance With no related allowance recorded: Construction $ 10,596 $ 10,609 $ — Commercial real estate 5,364 6,830 — Consumer real estate 3,814 3,898 — Commercial and industrial 3,958 6,966 — Consumer 167 167 — Total $ 23,899 $ 28,470 $ — With an allowance recorded: Construction $ 2,108 $ 2,122 $ 516 Commercial real estate 20,190 20,853 4,722 Consumer real estate 2,203 2,287 384 Commercial and industrial 123,353 131,221 20,433 Consumer 103 103 25 Total $ 147,957 $ 156,586 $ 26,080 Total impaired loans: Construction $ 12,704 $ 12,731 $ 516 Commercial real estate 25,554 27,683 4,722 Consumer real estate 6,017 6,185 384 Commercial and industrial 127,311 138,187 20,433 Consumer 270 270 25 Total $ 171,856 $ 185,056 $ 26,080 December 31, 2015 (In thousands) Recorded Investment Contractual Balance Related Allowance With no related allowance recorded: Construction $ 902 $ 915 $ — Commercial real estate 12,090 12,424 — Consumer real estate 2,802 2,938 — Commercial and industrial 6,072 6,264 — Consumer 130 130 — Total $ 21,996 $ 22,671 $ — With an allowance recorded: Construction $ 1,728 $ 1,755 $ 508 Commercial real estate 17,917 17,982 5,674 Consumer real estate 1,516 1,534 322 Commercial and industrial 113,580 113,862 40,176 Consumer 14 14 13 Total $ 134,755 $ 135,147 $ 46,693 Total impaired loans: Construction $ 2,630 $ 2,670 $ 508 Commercial real estate 30,007 30,406 5,674 Consumer real estate 4,318 4,472 322 Commercial and industrial 119,652 120,126 40,176 Consumer 144 144 13 Total $ 156,751 $ 157,818 $ 46,693 For the Three Months Ended June 30, 2016 June 30, 2015 (In thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Construction $ 10,352 $ — $ 883 $ 18 Commercial real estate 5,683 — 3,402 14 Consumer real estate 3,466 6 2,364 — Commercial and industrial 3,929 — 7,514 — Consumer 94 — 99 — Total $ 23,524 $ 6 $ 14,262 $ 32 With an allowance recorded: Construction $ 2,132 $ — $ 22 $ — Commercial real estate 22,199 6 10,143 60 Consumer real estate 2,214 — 318 — Commercial and industrial 118,710 297 16,322 — Consumer 205 — 1 — Total $ 145,460 $ 303 $ 26,806 $ 60 Total impaired loans: Construction $ 12,484 $ — $ 905 $ 18 Commercial real estate 27,882 6 13,545 74 Consumer real estate 5,680 6 2,682 — Commercial and industrial 122,639 297 23,836 — Consumer 299 — 100 — Total $ 168,984 $ 309 $ 41,068 $ 92 For the Six Months Ended June 30, 2016 June 30, 2015 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Construction $ 5,749 $ — $ 891 $ 18 Commercial real estate 8,727 20 4,529 14 Consumer real estate 3,308 7 2,348 3 Commercial and industrial 5,015 — 371 — Consumer 149 — 163 — Total $ 22,948 $ 27 $ 8,302 $ 35 With an allowance recorded: Construction $ 1,912 $ 17 $ 21 $ — Commercial real estate 19,060 75 8,711 60 Consumer real estate 1,860 7 292 — Commercial and industrial 118,466 299 16,038 4 Consumer 59 — 2 — Total $ 141,357 $ 398 $ 25,064 $ 64 Total impaired loans: Construction $ 7,661 $ 17 $ 912 $ 18 Commercial real estate 27,787 95 13,240 74 Consumer real estate 5,168 14 2,640 3 Commercial and industrial 123,481 299 16,409 4 Consumer 208 — 165 — Total $ 164,305 $ 425 $ 33,366 $ 99
Summary of Nonaccrual Loans	The following is a summary of information pertaining to nonaccrual loans as of the periods indicated: (In thousands) June 30, 2016 December 31, 2015 Nonaccrual loans: Construction $ 12,691 $ 2,633 Commercial real estate 21,634 27,937 Consumer real estate 5,948 4,538 Commercial and industrial 126,727 119,705 Consumer 310 125 Total $ 167,310 $ 154,938
Summary of Company's Troubled Debt Restructurings ("TDRs')	Information about the Company’s TDRs at June 30, 2016 and December 31, 2015 is presented in the following tables: (In thousands) Current Greater Than 30 Days Past Due Nonaccrual TDRs Total TDRs As of June 30, 2016 Real estate loans: Construction $ — $ — $ 1,249 $ 1,249 Commercial real estate 1,842 — — 1,842 Consumer real estate 561 — 127 688 Total real estate loans 2,403 — 1,376 3,779 Other loans: Commercial and industrial 447 — 115,375 115,822 Total loans $ 2,850 $ — $ 116,751 $ 119,601 (In thousands) Current Greater Than 30 Days Past Due Nonaccrual TDRs Total TDRs As of December 31, 2015 Real estate loans: Construction $ 1 $ — $ 366 $ 367 Commercial real estate 2,215 — 1,393 3,608 Consumer real estate 585 — 771 1,356 Total real estate loans 2,801 — 2,530 5,331 Other loans: Commercial and industrial 482 — 109,727 110,209 Total loans $ 3,283 $ — $ 112,257 $ 115,540
Summary of Information on TDRs Modification	The following table provides information on how the TDRs were modified during the six months ended June 30, 2016 and June 30, 2015. (In thousands) June 30, 2016 June 30, 2015 Maturity and interest rate adjustment $ — $ — Movement to, or extension of, interest rate-only payments 6,324 — Other concessions (1) — — Total $ 6,324 $ —
Summary of Information Pertaining to Modified Terms of Loans	A summary of information pertaining to modified terms of loans, as of the dates indicated, is as follows: As of June 30, 2016 (In thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Troubled debt restructuring: Construction 1 $ 1,249 $ 1,249 Commercial real estate 1 1,842 1,842 Consumer real estate 1 688 688 Commercial and industrial 18 115,822 115,822 21 $ 119,601 $ 119,601 As of December 31, 2015 (In thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Troubled debt restructuring: Construction 3 $ 367 $ 367 Commercial real estate 3 3,608 3,608 Consumer real estate 5 1,356 1,356 Commercial and industrial 30 110,209 110,209 41 $ 115,540 $ 115,540

Investments in Tax Credit Ent27

Investments in Tax Credit Entities (Tables)	6 Months Ended
	Jun. 30, 2016
Investments, All Other Investments [Abstract]
Investment Holdings, Schedule of Investments	The tables below set forth the Company's investment in Federal and State NMTC, Federal Low-Income Housing, and Federal and State Historic Rehabilitation tax credits, along with the credits earned and expected to be generated through its participation in these programs as of June 30, 2016 and December 31, 2015 : June 30, 2016 (In thousands) Investment Total Impairment(1) Loans to Investment Funds(2) Elimination(3) Net Investment Tax Benefits Recognized Through December 31, 2015 Tax Benefits Earned and Expected to be Recognized in 2016 Tax Benefits Earned and Expected to be Recognized in 2017, and Thereafter Total Tax Benefits Earned and to be Recognized NMTC: Federal: Bank Owned CDEs $ 154,720 $ (11,828 ) $ — $ (118,000 ) $ 24,892 $ 23,070 $ 7,080 $ 15,870 $ 46,020 Non-Bank Owned CDEs 191,303 (27,898 ) (141,200 ) — 22,205 46,349 9,792 18,084 74,225 Total NMTC 346,023 (39,726 ) (141,200 ) (118,000 ) 47,097 69,419 16,872 33,954 120,245 Low-Income Housing 30,175 (7,177 ) — — 22,998 17,153 5,051 33,921 56,125 Historic Rehabilitation: Federal(4) 89,991 (76,280 ) — — 13,711 75,305 51,381 — 126,686 State 13,437 (4,363 ) — — 9,074 — — — — Total Historic Rehabilitation(5) 103,428 (80,643 ) — — 22,785 75,305 51,381 — 126,686 Total $ 479,626 $ (127,546 ) $ (141,200 ) $ (118,000 ) $ 92,880 $ 161,877 $ 73,304 $ 67,875 $ 303,056 (1) Amount represents impairment recorded from the date of original investment through the current period, as evaluated by the Company at the end of each reporting period. (2) Interest-only leverage loans made to the investment fund during the compliance period for Federal NMTC. This amount is recorded as an offset to the Federal NMTC investment due to the interest-only leverage loan being repaid at the end of the compliance period. (3) Through June 30, 2016 , FNBC CDE received allocations of Federal NMTC from the CDFI Fund of the U.S. Treasury totaling $118.0 million over a three year period beginning in 2011. These investments are eliminated upon consolidation by the Company. (4) As of June 30, 2016 , the Company had $2.6 million invested and $23.0 million in outstanding commitments in Federal Historic Rehabilitation tax credit projects which the Company expects to generate Federal Historic Rehabilitation tax credits in 2017 and thereafter when the projects are completed, receive the certificates of occupancy, and the property is placed into service. The amount of tax credits to be received will be determined when the costs are certified. (5) The total accumulated impairment includes $ 0.5 million in additional accrued impairment in 2016 which is owed to the project based on the investment payment terms. December 31, 2015 (In thousands) Investment Total Impairment(1) Loans to Investment Funds(2) Elimination(3) Net Investment Tax Benefits Recognized Through December 31, 2014 Tax Benefits Recognized in 2015 Tax Benefits Earned and to be Recognized in 2016, and Thereafter Total Tax Benefits Earned and to be Recognized NMTC: Federal: Bank Owned CDEs $ 154,720 $ (8,288 ) $ — $ (118,000 ) $ 28,432 $ 16,490 $ 6,580 $ 22,950 $ 46,020 Non-Bank Owned CDEs 171,303 (23,738 ) (127,520 ) — 20,045 36,580 9,769 20,076 66,425 State 13,810 — — — 13,810 — — — — Total NMTC 339,833 (32,026 ) (127,520 ) (118,000 ) 62,287 53,070 16,349 43,026 112,445 Low-Income Housing 30,166 (5,979 ) — — 24,187 13,188 3,965 38,972 56,125 Historic Rehabilitation: Federal(4) 69,177 (55,220 ) — — 13,957 34,335 40,970 — 75,305 State 12,518 (4,363 ) — — 8,155 — — — — Total Historic Rehabilitation(5) 81,695 (59,583 ) — — 22,112 34,335 40,970 — 75,305 Total $ 451,694 $ (97,588 ) $ (127,520 ) $ (118,000 ) $ 108,586 $ 100,593 $ 61,284 $ 81,998 $ 243,875 (1) Amount represents impairment recorded from the date of original investment through the current period, as evaluated by the Company at the end of each reporting period. (2) Interest-only leverage loans made to the investment fund during the compliance period for Federal NMTC. This amount is recorded as an offset to the Federal NMTC investment due to the interest-only leverage loan being repaid at the end of the compliance period. (3) Through December 31, 2015 , FNBC CDE received allocations of Federal NMTC from the CDFI Fund of the U.S. Treasury totaling $118.0 million over a three year period beginning in 2011. These investments are eliminated upon consolidation by the Company. (4) As of December 31, 2015 , the Company had $10.9 million invested and $ 39.1 million in outstanding commitments in Federal Historic Rehabilitation tax credit projects which the Company expects to generate Federal Historic Rehabilitation tax credits in 2016, 2017 and 2018 when the projects are completed, receive the certificates of occupancy, and the property is placed into service. The amount of tax credits to be received will be determined when the costs are certified. (5) The total accumulated impairment includes $ 5.8 million in additional accrued impairment in 2015 which is owed to the project based on the investment payment terms.
Schedule of Amortization of Credit Investments	The impairment of tax credit investments for the three and six month periods ended June 30, 2016 and 2015 were as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, (In thousands) 2016 2015 2016 2015 (Restated) (Restated) Federal NMTC $ 3,850 $ 3,703 $ 7,700 $ 7,406 Federal Low-Income Housing 599 (765 ) 1,198 158 Federal and State Historic Rehabilitation 10,267 8,723 20,533 17,444 Total impairment $ 14,716 $ 11,661 $ 29,431 $ 25,008
Summary of Major Classifications of Loans	Major classifications of loans at June 30, 2016 and December 31, 2015 were as follows: (In thousands) June 30, 2016 December 31, 2015 Commercial real estate loans: Construction $ 548,563 $ 522,269 Mortgage(1) 1,642,719 1,423,545 2,191,282 1,945,814 Consumer real estate loans: Construction 16 9 Mortgage 234,787 264,422 234,803 264,431 Commercial and industrial loans 1,304,952 1,221,283 Loans to individuals, excluding real estate 28,139 21,688 Other loans 20,809 5,377 3,779,985 3,458,593 Less allowance for loan losses (76,964 ) (78,478 ) Loans, net $ 3,703,021 $ 3,380,115 (1) Included in commercial real estate loans, mortgage, are owner-occupied real estate loans of $502.1 million at June 30, 2016 and $449.1 million at December 31, 2015 . These loans were classified in the Company's loan portfolio at June 30, 2016 and December 31, 2015 as follows: (In thousands) June 30, 2016 December 31, 2015 Construction $ 59,110 $ 43,962 Commercial real estate 78,351 67,579 Commercial and industrial 145,201 117,389 Total loans $ 282,662 $ 228,930

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	The following is a summary of short-term borrowings at June 30, 2016 and December 31, 2015 : (In thousands) June 30, 2016 December 31, 2015 FHLB $ 7,022 $ 8,000 Total short-term borrowings $ 7,022 $ 8,000

Derivative - Interest Rate Sw29

Derivative - Interest Rate Swap Agreements (Tables)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Swaps	A summary of the Company's interest rate-prime swaps as of June 30, 2016 is as follows: (In thousands) Notional Amount Fixed Rate Term Interest rate-prime swaps: Counterparty B: Prime plus 1% floored at 5% $ 100,000 6.010% September 2013 - September 2019 Prime plus 1% floored at 5.5% 80,000 6.260% September 2013 - September 2019 180,000 Counterparty C: Prime 30,000 4.500% December 2015 - September 2022 Prime plus 1% 40,000 5.490% December 2015 - September 2022 Prime plus 1% floored at 5% 40,000 5.810% March 2015 - March 2021 Prime plus 2% 15,000 6.560% March 2015 - March 2021 Prime plus 2% actual/365 10,000 6.560% March 2015 - March 2021 135,000 Total interest rate-prime swaps $ 315,000 A summary of the Company's interest rate swaps as of June 30, 2016 is as follows: (In thousands) Notional Amount Fixed Payment Rate Term Interest rate swaps: Counterparty B: Three-month LIBOR swap $ 150,000 4.165% December 2016 - September 2023 150,000 Counterparty C: Three-month LIBOR swap 55,000 2.652% January 2018 - October 2023 Three-month LIBOR swap 55,000 2.753% January 2019 - October 2024 Three-month LIBOR swap 55,000 2.793% July 2019 - April 2025 Three-month LIBOR swap 55,000 0.940% April 2016 - October 2017 Three-month LIBOR swap 55,000 1.060% April 2016 - October 2018 275,000 Total interest rate swaps $ 425,000
Schedule of Derivative Instruments	Information pertaining to outstanding derivative instruments is as follows: Derivative Assets Fair Value Derivative Liabilities Fair Value (In thousands) Balance Sheet Location June 30, 2016 December 31, 2015 Balance Sheet Location June 30, 2016 December 31, 2015 Derivatives designated as hedging instruments under ASC Topic 815: Interest rate swaps - Counterparty B Other Assets $ — $ — Other Liabilities $ 31,046 $ 20,613 Interest rate-prime swaps - Counterparty B Other Assets 5,172 3,815 Other Liabilities — — Interest rate swaps - Counterparty C Other Assets — — Other Liabilities 13,311 3,037 Interest rate-prime swaps - Counterparty C Other Assets 5,596 541 Other Liabilities — 406 $ 10,768 $ 4,356 $ 44,357 $ 24,056
Schedule of Derivative Assets Subject to Master Netting Arrangements	The Company entered into master netting arrangements with both Counterparty B and Counterparty C whereby the delayed interest rate swaps and hedges would be settled net. Net fair values of the Counterparty B and Counterparty C delayed interest rate swaps and hedges as of June 30, 2016 and December 31, 2015 were as follows: June 30, 2016 Gross Amounts Presented in the Balance Sheet Gross Amounts Not Offset in the Balance Sheet (In thousands) Derivatives Collateral Net Derivatives subject to master netting arrangements: Derivative liabilities: Counterparty B $ 25,874 $ — $ — $ 25,874 Counterparty C 7,715 — — 7,715 Net derivative liability $ 33,589 $ — $ — $ 33,589 December 31, 2015 Gross Amounts Presented in the Balance Sheet Gross Amounts Not Offset in the Balance Sheet (In thousands) Derivatives Collateral Net Derivatives subject to master netting arrangements: Derivative liabilities: Counterparty B $ 16,798 $ — $ — $ 16,798 Counterparty C 2,902 — — 2,902 Net derivative liability $ 19,700 $ — $ — $ 19,700
Schedule of Derivative Liabilities Subject to Master Netting Arrangements	The Company entered into master netting arrangements with both Counterparty B and Counterparty C whereby the delayed interest rate swaps and hedges would be settled net. Net fair values of the Counterparty B and Counterparty C delayed interest rate swaps and hedges as of June 30, 2016 and December 31, 2015 were as follows: June 30, 2016 Gross Amounts Presented in the Balance Sheet Gross Amounts Not Offset in the Balance Sheet (In thousands) Derivatives Collateral Net Derivatives subject to master netting arrangements: Derivative liabilities: Counterparty B $ 25,874 $ — $ — $ 25,874 Counterparty C 7,715 — — 7,715 Net derivative liability $ 33,589 $ — $ — $ 33,589 December 31, 2015 Gross Amounts Presented in the Balance Sheet Gross Amounts Not Offset in the Balance Sheet (In thousands) Derivatives Collateral Net Derivatives subject to master netting arrangements: Derivative liabilities: Counterparty B $ 16,798 $ — $ — $ 16,798 Counterparty C 2,902 — — 2,902 Net derivative liability $ 19,700 $ — $ — $ 19,700
Schedule of Effect of Hedging Instruments	At June 30, 2016 and 2015 , and for the six months then ended, information pertaining to the effect of the hedging instruments on the consolidated financial statements is as follows: Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion) (In thousands) As of June 30, Derivatives in ASC Topic 815 Cash Flow Hedging Relationships: 2016 2015 Interest rate swap with Counterparty A $ (4,124 ) $ (4,844 ) Interest rate swap and prime swaps with Counterparty B (16,120 ) (7,592 ) Interest rate swap and prime swaps with Counterparty C (4,848 ) 944 Total $ (25,092 ) $ (11,492 )

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Summary of Income Tax Benefit on Statement of Income	The income tax benefit on the statement of income for the three and six months ended June 30, 2016 and 2015 was as follows: For the Three Months Ended For the Six Months Ended (In thousands) 2016 2015 2016 2015 (Restated) (Restated) Current tax expense $ 293 $ 831 $ 1,134 $ 1,911 Deferred tax benefit (4,343 ) (19,427 ) (45,054 ) (35,191 ) Total tax benefit $ (4,050 ) $ (18,596 ) $ (43,920 ) $ (33,280 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Summary of Total Notional Amount of Loan Commitments and Standby Letters of Credit	The following is a summary of the total notional amount of loan commitments and standby letters of credit outstanding at June 30, 2016 and December 31, 2015 : (In thousands) June 30, 2016 December 31, 2015 Standby letters of credit $ 140,668 $ 106,232 Unused loan commitments 717,682 715,759 Total $ 858,350 $ 821,991

Accumulated Other Comprehensi32

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Summary of Changes in Accumulated Other Comprehensive Income (Loss)	Changes in accumulated other comprehensive income (loss) by component are presented in the following table: (In thousands) Cash Flow Terminated Cash Flow Hedges(2) Transfers of Available Total Balance at January 1, 2016 $ (12,806 ) $ (3,685 ) $ (2,926 ) $ (1,968 ) $ (21,385 ) Other comprehensive income (loss) before income taxes: Net change in unrealized gain (loss) (13,889 ) 263 — 7,102 (6,524 ) Reclassification of net losses realized and included in earnings — 394 — — 394 Amortization of unrealized net gain — — 303 — 303 Income tax expense (benefit) (4,769 ) 138 106 2,484 (2,041 ) Balance at June 30, 2016 $ (21,926 ) $ (3,166 ) $ (2,729 ) $ 2,650 $ (25,171 ) (In thousands) Cash Flow Hedges(1) Terminated Cash Flow Hedge(2) Transfers of Available for Sale Securities to Held to Maturity Available for Sale Securities Total Balance at January 1, 2015 $ (8,396 ) $ (5,194 ) $ (3,354 ) $ (2,793 ) $ (19,737 ) Other comprehensive income (loss) before income taxes: Net change in unrealized gain 2,690 — — 472 3,162 Reclassification of net losses realized and included in earnings — 539 — — 539 Amortization of unrealized net gain — — 288 — 288 Income tax expense (benefit) 942 189 101 165 1,397 Balance at June 30, 2015 $ (6,648 ) $ (4,844 ) $ (3,167 ) $ (2,486 ) $ (17,145 ) (1) Balances represent the net operating changes in all of the Company's cash flow hedge relationships as of the dates stated. (2) Balances represent the net unrealized gains (loss) at termination of a certain cash flow hedge, interest rate swap cash flow hedge, and interest rate-prime swap cash flow hedge relationships. See Note 9 for further explanation on the terminated cash flow hedges.

Capital Requirements and Othe33

Capital Requirements and Other Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2016
Banking and Thrift [Abstract]
Summary of Capital Amounts and Ratios	The following tables present the actual capital amounts and regulatory capital ratios for the Company and the Bank as of June 30, 2016 and December 31, 2015 : June 30, 2016 "Well Capitalized" Minimums Actual (In thousands) Ratio Amount First NBC Bank Holding Company Tier 1 leverage capital 5.97 % $ 281,298 Tier 1 risk-based capital 6.41 % 281,298 Total risk-based capital 9.03 % 396,079 Common equity tier 1 risk-based capital 6.41 % 281,298 First NBC Bank Tier 1 leverage capital 5.00 % 7.26 % $ 340,612 Tier 1 risk-based capital 8.00 % 7.78 % 340,612 Total risk-based capital 10.00 % 9.05 % 396,439 Common equity tier 1 risk-based capital 6.50 % 7.78 % 340,612 December 31, 2015 "Well Capitalized" Minimums Actual (In thousands) Ratio Amount First NBC Bank Holding Company Tier 1 leverage capital 6.03 % $ 265,191 Tier 1 risk-based capital 6.33 % 265,191 Total risk-based capital 9.04 % 378,815 Common equity tier 1 risk-based capital 6.33 % 265,191 First NBC Bank Tier 1 leverage capital 5.00 % 7.44 % $ 321,346 Tier 1 risk-based capital 8.00 % 7.68 % 321,346 Total risk-based capital 10.00 % 8.96 % 374,976 Common equity tier 1 risk-based capital 6.50 % 7.68 % 321,346

Fair Value of Financial Instr34

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Carrying Value and Fair Value Measurements of Financial Assets and Liabilities on Recurring Basis	The Company has segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy, based on the inputs used to determine the fair value at the measurement date in the tables below: June 30, 2016 Fair Value Measurement Using (In thousands) Total Quoted Prices in Active Markets for Identical Assets ( Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale securities: U.S. government agency securities $ 149,449 $ — $ 149,449 $ — U.S. Treasury securities 13,128 — 13,128 — Municipal securities 12,127 — 12,127 — Mortgage-backed securities 118,507 — 118,507 — Corporate bonds 8,048 — 8,048 — Other equity securities 20 20 — — Total $ 301,279 $ 20 $ 301,259 $ — Liabilities Derivative instruments $ 33,589 $ — $ 33,589 $ — December 31, 2015 Fair Value Measurement Using (In thousands) Total Quoted Prices in Active Markets for Identical Assets ( Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale securities: U.S. government agency securities $ 149,675 $ — $ 149,675 $ — U.S. Treasury securities 12,703 — 12,703 — Municipal securities 12,100 — 12,100 — Mortgage-backed securities 77,511 — 77,511 — Corporate bonds 7,823 — 7,823 — Other equity securities 20 20 — — Other debt securities 25,994 — 25,994 — Total $ 285,826 $ 20 $ 285,806 $ — Liabilities Derivative instruments $ 19,700 $ — $ 19,700 $ —
Carrying Value and Fair Value Measurements of Financial Assets and Liabilities on Non Recurring Basis	The Company has segregated all financial assets and liabilities that are measured at fair value on a nonrecurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below: June 30, 2016 Fair Value Measurement Using (In thousands) Total Quoted Prices in Active Markets for Identical Assets ( Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Loans $ 147,957 $ — $ — $ 147,957 OREO 2,460 — — 2,460 Investment in tax credit entities 6,233 — — 6,233 $ 156,650 $ — $ — $ 156,650 December 31, 2015 Fair Value Measurement Using (In thousands) Total Quoted Prices in Active Markets for Identical Assets ( Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Loans $ 134,755 $ — $ — $ 134,755 OREO 3,701 — — 3,701 Investment in tax credit entities 1,425 — — 1,425 $ 139,881 $ — $ — $ 139,881
Carrying Value and Fair Value Measurements of Financial Instruments	The estimated fair values of the Company’s financial instruments were as follows as of the dates indicated: Fair Value Measurements at June 30, 2016 (In thousands) Carrying Amount Total Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents $ 146,011 $ 146,011 $ 146,011 $ — $ — Investment securities available for sale 301,279 301,279 20 301,259 — Investment securities held to maturity 79,598 85,442 — 85,442 — Loans and loans held for sale 3,783,183 3,766,902 — — 3,766,902 Financial Liabilities: Deposits, noninterest-bearing 381,553 381,553 — 381,553 — Deposits, interest-bearing 3,550,471 3,543,587 — — 3,543,587 Repurchase agreements 85,757 85,757 — 85,757 — Short-term borrowings 7,022 7,027 — 7,027 — Long-term borrowings 355,130 360,921 — 360,921 — Derivative instruments 33,589 33,589 — 33,589 — Fair Value Measurements at December 31, 2015 (In thousands) Carrying Amount Total Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 349,054 $ 349,054 $ 349,054 $ — $ — Investment in short-term receivables 25,604 25,604 25,604 — — Investment securities available for sale 285,826 285,826 20 285,806 — Investment securities held to maturity 82,074 82,799 — 82,799 — Loans and loans held for sale 3,466,268 3,444,920 — — 3,444,920 Financial Liabilities: Deposits, noninterest-bearing 368,421 368,421 — 368,421 — Deposits, interest-bearing 3,475,421 3,403,261 — — 3,403,261 Repurchase agreements 79,251 79,251 — 79,251 — Short-term borrowings 8,000 7,994 — 7,994 — Long-term borrowings 339,042 341,033 — 341,033 — Derivative instruments 19,700 19,700 — 19,700 —

Basis of Presentation (Details)

Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2016
Organization and Significant Accounting Policies [Line Items]
Tax credit carryforward period (years)	20 years
Tax credit as Percentage of project cost	39.00%
Minimum
Organization and Significant Accounting Policies [Line Items]
Interest at the end of compliance period (as a percent)	0.00%
Maximum
Organization and Significant Accounting Policies [Line Items]
Interest at the end of compliance period (as a percent)	25.00%
Low-Income Housing Credits
Organization and Significant Accounting Policies [Line Items]
Non voting interest (as a percent)	99.99%
Compliance period (years)	15 years
Interest percentage for general partners	0.01%
Low-Income Housing Credits | Minimum
Organization and Significant Accounting Policies [Line Items]
Federal Tax Credit, Adjustment Period (years)	10 years
Low-Income Housing Credits | Maximum
Organization and Significant Accounting Policies [Line Items]
Federal Tax Credit, Adjustment Period (years)	15 years
Federal NMTC
Organization and Significant Accounting Policies [Line Items]
Compliance period (years)	7 years
CDE fee (as a percent)	4.00%
Annual fee (as a percent)	0.50%
Federal NMTC | Minimum
Organization and Significant Accounting Policies [Line Items]
Federal Tax Credit, Adjustment Period (years)	7 years
Federal and State Historic Rehabilitation
Organization and Significant Accounting Policies [Line Items]
Non voting interest (as a percent)	99.00%
Compliance period (years)	5 years
Interest percentage for general partners	1.00%
First Three Years
Organization and Significant Accounting Policies [Line Items]
Tax credit as Percentage of project cost	5.00%
Next Four Years
Organization and Significant Accounting Policies [Line Items]
Tax credit as Percentage of project cost	6.00%

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) $ / shares in Units, $ in Thousands	Nov. 30, 2015USD ($)$ / shares	Jan. 16, 2015USD ($)facility	Dec. 31, 2015USD ($)acquisition	Jun. 30, 2016USD ($)
First National Bank of Crestview and State-Investors Bank
Business Acquisition [Line Items]
Acquisition related costs			$ 1,200
Number of acquisitions | acquisition			2
First National Bank of Crestview
Business Acquisition [Line Items]
Fair value of assets acquired, including identifiable intangible assets		$ 62,263		$ 61,088
Number of banks acquired | facility		3
Contingency, amount of settlement		$ 10,000
Goodwill		1,191
Total consideration received		$ 10,035
State-Investors Bank
Business Acquisition [Line Items]
Fair value of assets acquired, including identifiable intangible assets	$ 254,627			$ 254,080
Goodwill	$ 8,645
Per share price of common stock converted to cash (in dollars per share) | $ / shares	$ 21.51
Total consideration received	$ 48,744

Acquisitions - Consideration Tr

Acquisitions - Consideration Transferred (Details) - USD ($) $ in Thousands	Nov. 30, 2015	Jan. 16, 2015	Jun. 30, 2016
State-Investors Bank
Business Acquisition [Line Items]
Total consideration received	$ 48,744
Fair value of assets acquired, including identifiable intangible assets	254,627		$ 254,080
Fair value of liabilities assumed	211,868		213,981
Goodwill	$ 8,645
First National Bank of Crestview
Business Acquisition [Line Items]
Total consideration received		$ 10,035
Fair value of assets acquired, including identifiable intangible assets		62,263	61,088
Fair value of liabilities assumed		72,298	$ 72,314
Goodwill		$ 1,191

Acquisitions - Assets and Liabi

Acquisitions - Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	6 Months Ended	7 Months Ended	17 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2016	Nov. 30, 2015	Jan. 16, 2015
First National Bank of Crestview
Assets
Cash and due from banks	$ 1,511	$ 1,511	$ 1,511		$ 1,511
Short-term investments	19,971	19,971	19,971		19,971
Investment securities-available for sale	9,559	9,559	9,559		9,559
Loans	26,444	26,444	26,444		27,647
Bank premises	3,120	3,120	3,120		3,120
Core deposit intangible	188	188	188		0
Other assets	295	295	295		455
Total Assets	61,088	61,088	61,088		62,263
Deposits:
Non-interest bearing	22,680	22,680	22,680		22,680
Interest bearing	49,600	49,600	49,600		49,584
Total deposits	72,280	72,280	72,280		72,264
Other liabilities	34	34	34		34
Total Liabilities	$ 72,314	72,314	72,314		$ 72,298
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Cash and due from banks			0
Short-term investments			0
Investment securities-available for sale			0
Loans			(1,203)
Bank premises			0
Core deposit intangible			188
Other assets			(160)
Total Assets			(1,175)
Noninterest-bearing deposits			0
Interest bearing deposits			16
Total deposits			16
Other liabilities			0
Total Liabilities			16
Intangible assets, estimated useful life (in years)	12 years
Amortization period for fair value adjustment of interest bearing deposit liabilities (in months)	49 months
State-Investors Bank
Assets
Cash and due from banks	$ 20,031	20,031	20,031	$ 20,031
Short-term investments	12,338	12,338	12,338	12,338
Investment securities-available for sale	27,195	27,195	27,195	27,388
Loans	179,419	179,419	179,419	182,249
Bank premises	8,300	8,300	8,300	7,708
Deferred tax asset	2,420	2,420	2,420	1,004
Core deposit intangible	468	468	468	0
Other assets	3,909	3,909	3,909	3,909
Total Assets	254,080	254,080	254,080	254,627
Deposits:
Non-interest bearing	11,416	11,416	11,416	11,416
Interest bearing	142,480	142,480	142,480	141,235
Total deposits	153,896	153,896	153,896	152,651
Borrowings	56,781	56,781	56,781	55,913
Other liabilities	3,304	3,304	3,304	3,304
Total Liabilities	$ 213,981	213,981	$ 213,981	$ 211,868
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Cash and due from banks		0
Short-term investments		0
Investment securities-available for sale		(193)
Loans		(2,830)
Bank premises		592
Deferred tax asset		1,416
Core deposit intangible		468
Other assets		0
Total Assets		(547)
Noninterest-bearing deposits		0
Interest bearing deposits		1,245
Total deposits		1,245
Borrowings		868
Other liabilities		0
Total Liabilities		$ 2,113
Intangible assets, estimated useful life (in years)	12 years

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic: Income available to common shareholders	$ 3,382	$ 12,388	$ 26,078	$ 22,054
Weighted-average common shares outstanding	19,105	18,620	19,096	18,611
Basic earnings per share (in usd per share)	$ 0.18	$ 0.67	$ 1.37	$ 1.19
Diluted: Income available to common shareholders	$ 3,382	$ 12,388	$ 26,078	$ 22,054
Weighted-average common shares outstanding	19,105	18,620	19,096	18,611
Effect of dilutive securities:
Stock options outstanding (in shares)	154	418	233	401
Restricted shares outstanding (in shares)	0	3	0	2
Warrants (in shares)	74	124	78	121
Weighted-average common shares outstanding – assuming dilution	19,333	19,165	19,407	19,135
Diluted earnings per share (in usd per share)	$ 0.18	$ 0.65	$ 1.34	$ 1.15
Restricted Stock
Effect of dilutive securities:
Antidilutive securities excluded from computation of EPS (in shares)	51		34

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Market Values of Investment Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available for sale:
Amortized Cost	$ 297,201	$ 288,843
Gross Unrealized Gains	4,393	996
Gross Unrealized Losses Less Than One Year	(274)	(2,806)
Gross Unrealized Losses Greater Than One Year	(41)	(1,207)
Estimated Market Value	301,279	285,826
Held to maturity:
Amortized Cost	79,598	82,074
Gross Unrealized Gains	5,862	2,562
Gross Unrealized Losses Less Than One Year	0	(196)
Gross Unrealized Losses Greater Than One Year	(18)	(1,640)
Estimated Market Value	85,442	82,800
U.S. government agency securities
Available for sale:
Amortized Cost	146,702	151,369
Gross Unrealized Gains	2,747	552
Gross Unrealized Losses Less Than One Year	0	(1,591)
Gross Unrealized Losses Greater Than One Year	0	(655)
Estimated Market Value	149,449	149,675
U.S. Treasury securities
Available for sale:
Amortized Cost	13,014	13,015
Gross Unrealized Gains	114	0
Gross Unrealized Losses Less Than One Year	0	0
Gross Unrealized Losses Greater Than One Year	0	(312)
Estimated Market Value	13,128	12,703
Municipal securities
Available for sale:
Amortized Cost	11,969	12,115
Gross Unrealized Gains	158	76
Gross Unrealized Losses Less Than One Year	0	0
Gross Unrealized Losses Greater Than One Year	0	(91)
Estimated Market Value	12,127	12,100
Held to maturity:
Amortized Cost	38,162	38,950
Gross Unrealized Gains	2,588	1,888
Gross Unrealized Losses Less Than One Year	0	0
Gross Unrealized Losses Greater Than One Year	0	(18)
Estimated Market Value	40,750	40,820
Mortgage-backed securities
Available for sale:
Amortized Cost	117,475	78,227
Gross Unrealized Gains	1,347	367
Gross Unrealized Losses Less Than One Year	(274)	(934)
Gross Unrealized Losses Greater Than One Year	(41)	(149)
Estimated Market Value	118,507	77,511
Held to maturity:
Amortized Cost	41,436	43,124
Gross Unrealized Gains	3,274	674
Gross Unrealized Losses Less Than One Year	0	(196)
Gross Unrealized Losses Greater Than One Year	(18)	(1,622)
Estimated Market Value	44,692	41,980
Corporate bonds
Available for sale:
Amortized Cost	8,021	8,103
Gross Unrealized Gains	27	0
Gross Unrealized Losses Less Than One Year	0	(280)
Gross Unrealized Losses Greater Than One Year	0	0
Estimated Market Value	8,048	7,823
Other equity securities
Available for sale:
Amortized Cost	20	20
Gross Unrealized Gains	0	0
Gross Unrealized Losses Less Than One Year	0	0
Gross Unrealized Losses Greater Than One Year	0	0
Estimated Market Value	$ 20	20
Other debt securities
Available for sale:
Amortized Cost		25,994
Gross Unrealized Gains		1
Gross Unrealized Losses Less Than One Year		(1)
Gross Unrealized Losses Greater Than One Year		0
Estimated Market Value		$ 25,994

Investment Securities - Additio

Investment Securities - Additional Information (Detail) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016USD ($)security	Dec. 31, 2013USD ($)	Dec. 31, 2015USD ($)security
Investments, Debt and Equity Securities [Abstract]
Transfer of securities with fair value		$ 95.4
Accumulated other comprehensive loss included net pre-tax unrealized losses	$ 4.2	$ 5.9
Number of securities in loss position | security	51		205
Securities with estimated market values	$ 225.5		$ 233.2

Investment Securities - Summa42

Investment Securities - Summary of Amortized Cost and Estimated Market Values by Contractual Maturity of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available for sale:
Weighted average yield, Due in one year or less	1.91%	1.19%
Weighted average yield, Due after one year through five years	1.89%	1.71%
Weighted average yield, Due after five years through ten years	2.44%	1.88%
Weighted average yield, Due after ten years	2.44%	2.29%
Weighted average yield, Total securities	2.00%	1.77%
Amortized Cost, Due in one year or less	$ 84,431	$ 36,599
Amortized Cost, Due after one year through five years	146,155	134,275
Amortized Cost, Due after five years through ten years	54,069	105,950
Amortized Cost, Due after ten years	12,546	12,019
Amortized Cost	297,201	288,843
Estimated Market Value, Due in one year or less	85,284	36,558
Estimated Market Value, Due after one year through five years	148,084	133,485
Estimated Market Value, Due after five years through ten years	55,341	104,184
Estimated Market Value, Due after ten years	12,570	11,599
Estimated Market Value	$ 301,279	$ 285,826
Held to maturity:
Weighted average yield, Due in one year or less	9.68%	4.90%
Weighted average yield, Due after one year through five years	3.86%	3.68%
Weighted average yield, Due after five years through ten years	3.18%	3.25%
Weighted average yield, Due after ten years	3.67%	3.44%
Weighted average yield, Total securities	3.74%	3.57%
Amortized Cost, Due in one year or less	$ 8,710	$ 3,190
Amortized Cost, Due after one year through five years	40,584	36,673
Amortized Cost, Due after five years through ten years	10,423	14,416
Amortized Cost, Due after ten years	19,881	27,795
Amortized Cost, Total securities	79,598	82,074
Estimated Market Value, Due in one year or less	8,892	3,068
Estimated Market Value, Due after one year through five years	43,409	38,371
Estimated Market Value, Due after five years through ten years	11,162	14,968
Estimated Market Value, Due after ten years	21,979	26,393
Estimated Market Value	$ 85,442	$ 82,800

Loans - Summary of Major Classi

Loans - Summary of Major Classifications of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Commercial real estate loans:
Construction	$ 548,563		$ 522,269
Mortgage	1,642,719		1,423,545
Total commercial real estate loans	2,191,282		1,945,814
Consumer real estate loans:
Construction	16		9
Mortgage	234,787		264,422
Total consumer real estate loans	234,803		264,431
Commercial and industrial loans	1,304,952		1,221,283
Loans to individuals, excluding real estate	28,139		21,688
Other loans	20,809		5,377
Total Loans	3,779,985		3,458,593
Less allowance for loan losses	(76,964)	$ (84,189)	(78,478)	$ (50,351)	$ (45,195)	$ (42,336)
Loans, net	3,703,021		3,380,115
Owner Occupied Commercial Real Estate Loan	$ 502,100		$ 449,100

Loans - Summary of Allowance fo

Loans - Summary of Allowance for Loan Losses and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 84,189	$ 45,195	$ 78,478	$ 42,336
Charge-offs	(880)	(698)	(9,937)	(905)
Recoveries	20	254	40	320
(Recovery) Provision	(6,365)	5,600	8,383	8,600
Balance, end of period	76,964	50,351	76,964	50,351
Individually evaluated for impairment	26,080		26,080		$ 46,693
Collectively evaluated for impairment	50,884		50,884		31,785
Total	76,964		76,964		78,478
Total Loans	3,779,985		3,779,985		3,458,593
Loans receivable
Allowance for Loan and Lease Losses [Roll Forward]
Individually evaluated for impairment	171,856		171,856		156,751
Collectively evaluated for impairment	3,608,129		3,608,129		3,301,842
Total Loans	3,779,985		3,779,985		3,458,593
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	6,706	4,733	5,027	4,030
Charge-offs	(25)	(10)	(25)	(12)
Recoveries	0	0	0	0
(Recovery) Provision	(609)	628	1,070	1,333
Balance, end of period	6,072	5,351	6,072	5,351
Individually evaluated for impairment	516		516		508
Collectively evaluated for impairment	5,556		5,556		4,519
Total	6,072		6,072		5,027
Total Loans	548,579		548,579		522,278
Construction | Loans receivable
Allowance for Loan and Lease Losses [Roll Forward]
Individually evaluated for impairment	12,704		12,704		2,630
Collectively evaluated for impairment	535,875		535,875		519,648
Total Loans	548,579		548,579		522,278
Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	21,115	16,750	18,016	14,965
Charge-offs	(300)	(501)	(496)	(530)
Recoveries	9	243	13	243
(Recovery) Provision	6,260	327	9,551	2,141
Balance, end of period	27,084	16,819	27,084	16,819
Individually evaluated for impairment	4,722		4,722		5,674
Collectively evaluated for impairment	22,362		22,362		12,342
Total	27,084		27,084		18,016
Total Loans	1,642,719		1,642,719		1,423,545
Commercial Real Estate | Loans receivable
Allowance for Loan and Lease Losses [Roll Forward]
Individually evaluated for impairment	25,554		25,554		30,007
Collectively evaluated for impairment	1,617,165		1,617,165		1,393,538
Total Loans	1,642,719		1,642,719		1,423,545
Consumer Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,293	3,316	3,500	3,316
Charge-offs	(45)	(41)	(45)	(41)
Recoveries	4	2	4	2
(Recovery) Provision	(1,408)	257	385	257
Balance, end of period	3,844	3,534	3,844	3,534
Individually evaluated for impairment	384		384		322
Collectively evaluated for impairment	3,460		3,460		3,178
Total	3,844		3,844		3,500
Total Loans	234,787		234,787		264,422
Consumer Real Estate | Loans receivable
Allowance for Loan and Lease Losses [Roll Forward]
Individually evaluated for impairment	6,017		6,017		4,318
Collectively evaluated for impairment	228,770		228,770		260,104
Total Loans	234,787		234,787		264,422
Commercial and Industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	50,746	20,205	51,736	19,814
Charge-offs	(505)	(122)	(9,364)	(272)
Recoveries	2	5	14	66
(Recovery) Provision	(10,627)	4,388	(2,770)	4,868
Balance, end of period	39,616	24,476	39,616	24,476
Individually evaluated for impairment	20,433		20,433		40,176
Collectively evaluated for impairment	19,183		19,183		11,560
Total	39,616		39,616		51,736
Total Loans	1,325,761		1,325,761		1,226,660
Commercial and Industrial | Loans receivable
Allowance for Loan and Lease Losses [Roll Forward]
Individually evaluated for impairment	127,311		127,311		119,652
Collectively evaluated for impairment	1,198,450		1,198,450		1,107,008
Total Loans	1,325,761		1,325,761		1,226,660
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	329	191	199	211
Charge-offs	(5)	(24)	(7)	(50)
Recoveries	5	4	9	9
(Recovery) Provision	19	0	147	1
Balance, end of period	348	$ 171	348	$ 171
Individually evaluated for impairment	25		25		13
Collectively evaluated for impairment	323		323		186
Total	348		348		199
Total Loans	28,139		28,139		21,688
Consumer | Loans receivable
Allowance for Loan and Lease Losses [Roll Forward]
Individually evaluated for impairment	270		270		144
Collectively evaluated for impairment	27,869		27,869		21,544
Total Loans	$ 28,139		$ 28,139		$ 21,688

Loans - Summary of Credit Quali

Loans - Summary of Credit Quality Indicators on Company's Loan Portfolio (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 3,779,985	$ 3,458,593
Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	548,579	522,278
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,642,719	1,423,545
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	234,787	264,422
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,325,761	1,226,660
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	28,139	21,688
Pass and Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,370,625	3,082,864
Pass and Pass/Watch | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	451,226	444,713
Pass and Pass/Watch | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,546,679	1,325,513
Pass and Pass/Watch | Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	218,732	252,707
Pass and Pass/Watch | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,126,209	1,038,567
Pass and Pass/Watch | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	27,779	21,364
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	27,511	22,795
Special Mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,216	15,230
Special Mention | Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,533	175
Special Mention | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,754	7,377
Special Mention | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	8	13
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	362,525	333,609
Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	97,353	77,565
Substandard | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	83,824	82,802
Substandard | Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,522	11,540
Substandard | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	170,474	161,391
Substandard | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	352	311
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	19,324	19,325
Doubtful | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	19,324	19,325
Doubtful | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 0	$ 0

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due Loans	$ 45,545,000	$ 21,659,000
Average recorded investment in nonaccrual loan	163,100,000	34,000,000
Amount of interest income	4,400,000	1,800,000
Commitment to lend additional funds	100,000	0
Receivables Acquired with Deteriorated Credit Quality | Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	3,400,000	3,200,000
90 Days and Greater Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due Loans	32,525,000	12,219,000
90 Days and Greater Past Due | Secured Tuition Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due Loans	$ 0	$ 100,000

Loans - Age Analysis of Past Du

Loans - Age Analysis of Past Due Loans Including Loans Acquired with Deteriorated Credit Quality (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	$ 45,545	$ 21,659
Current Loans	3,734,440	3,436,934
Total Loans	3,779,985	3,458,593
Total real estate loans
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	29,367	16,478
Current Loans	2,396,718	2,193,767
Total Loans	2,426,085	2,210,245
Total other loans
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	16,178	5,181
Current Loans	1,337,722	1,243,167
Total Loans	1,353,900	1,248,348
Construction
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	12,031	1,411
Current Loans	536,548	520,867
Total Loans	548,579	522,278
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	9,052	6,922
Current Loans	1,633,667	1,416,623
Total Loans	1,642,719	1,423,545
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	8,284	8,145
Current Loans	226,503	256,277
Total Loans	234,787	264,422
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	16,059	4,606
Current Loans	1,309,702	1,222,054
Total Loans	1,325,761	1,226,660
Consumer
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	119	575
Current Loans	28,020	21,113
Total Loans	28,139	21,688
Greater Than 30 and Fewer Than 90 Days Past Due
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	13,020	9,440
Greater Than 30 and Fewer Than 90 Days Past Due | Total real estate loans
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	8,334	7,037
Greater Than 30 and Fewer Than 90 Days Past Due | Total other loans
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	4,686	2,403
Greater Than 30 and Fewer Than 90 Days Past Due | Construction
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	656	430
Greater Than 30 and Fewer Than 90 Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	3,941	979
Greater Than 30 and Fewer Than 90 Days Past Due | Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	3,737	5,628
Greater Than 30 and Fewer Than 90 Days Past Due | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	4,648	2,018
Greater Than 30 and Fewer Than 90 Days Past Due | Consumer
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	38	385
90 Days and Greater Past Due
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	32,525	12,219
90 Days and Greater Past Due | Total real estate loans
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	21,033	9,441
90 Days and Greater Past Due | Total other loans
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	11,492	2,778
90 Days and Greater Past Due | Construction
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	11,375	981
90 Days and Greater Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	5,111	5,943
90 Days and Greater Past Due | Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	4,547	2,517
90 Days and Greater Past Due | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	11,411	2,588
90 Days and Greater Past Due | Consumer
Financing Receivable, Recorded Investment [Line Items]
Past Due Loans	$ 81	$ 190

Loans - Summary of Information

Loans - Summary of Information Pertaining to Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	$ 23,899		$ 23,899		$ 21,996
With no related allowance recorded, Contractual Balance	28,470		28,470		22,671
With no related allowance recorded, Related Allowance	0		0		0
With an allowance recorded, Recorded Investment	147,957		147,957		134,755
With an allowance recorded, Contractual Balance	156,586		156,586		135,147
With an allowance recorded, Related Allowance	26,080		26,080		46,693
Total impaired loans, Recorded Investment	171,856		171,856		156,751
Total impaired loans, Contractual Balance	185,056		185,056		157,818
Total impaired loans, Related Allowance	26,080		26,080		46,693
With no related allowance recorded, Average Recorded Investment	23,524	$ 14,262	22,948	$ 8,302
With no related allowance recorded, Interest Income Recognized	6	32	27	35
With an allowance recorded, Average Recorded Investment	145,460	26,806	141,357	25,064
With an allowance recorded, Interest Income Recognized	303	60	398	64
Total impaired loans, Average Recorded Investment	168,984	41,068	164,305	33,366
Total impaired loans, Interest Income Recognized	309	92	425	99
Construction
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	10,596		10,596		902
With no related allowance recorded, Contractual Balance	10,609		10,609		915
With no related allowance recorded, Related Allowance	0		0		0
With an allowance recorded, Recorded Investment	2,108		2,108		1,728
With an allowance recorded, Contractual Balance	2,122		2,122		1,755
With an allowance recorded, Related Allowance	516		516		508
Total impaired loans, Recorded Investment	12,704		12,704		2,630
Total impaired loans, Contractual Balance	12,731		12,731		2,670
Total impaired loans, Related Allowance	516		516		508
With no related allowance recorded, Average Recorded Investment	10,352	883	5,749	891
With no related allowance recorded, Interest Income Recognized	0	18	0	18
With an allowance recorded, Average Recorded Investment	2,132	22	1,912	21
With an allowance recorded, Interest Income Recognized	0	0	17	0
Total impaired loans, Average Recorded Investment	12,484	905	7,661	912
Total impaired loans, Interest Income Recognized	0	18	17	18
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	5,364		5,364		12,090
With no related allowance recorded, Contractual Balance	6,830		6,830		12,424
With no related allowance recorded, Related Allowance	0		0		0
With an allowance recorded, Recorded Investment	20,190		20,190		17,917
With an allowance recorded, Contractual Balance	20,853		20,853		17,982
With an allowance recorded, Related Allowance	4,722		4,722		5,674
Total impaired loans, Recorded Investment	25,554		25,554		30,007
Total impaired loans, Contractual Balance	27,683		27,683		30,406
Total impaired loans, Related Allowance	4,722		4,722		5,674
With no related allowance recorded, Average Recorded Investment	5,683	3,402	8,727	4,529
With no related allowance recorded, Interest Income Recognized	0	14	20	14
With an allowance recorded, Average Recorded Investment	22,199	10,143	19,060	8,711
With an allowance recorded, Interest Income Recognized	6	60	75	60
Total impaired loans, Average Recorded Investment	27,882	13,545	27,787	13,240
Total impaired loans, Interest Income Recognized	6	74	95	74
Consumer Real Estate
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	3,814		3,814		2,802
With no related allowance recorded, Contractual Balance	3,898		3,898		2,938
With no related allowance recorded, Related Allowance	0		0		0
With an allowance recorded, Recorded Investment	2,203		2,203		1,516
With an allowance recorded, Contractual Balance	2,287		2,287		1,534
With an allowance recorded, Related Allowance	384		384		322
Total impaired loans, Recorded Investment	6,017		6,017		4,318
Total impaired loans, Contractual Balance	6,185		6,185		4,472
Total impaired loans, Related Allowance	384		384		322
With no related allowance recorded, Average Recorded Investment	3,466	2,364	3,308	2,348
With no related allowance recorded, Interest Income Recognized	6	0	7	3
With an allowance recorded, Average Recorded Investment	2,214	318	1,860	292
With an allowance recorded, Interest Income Recognized	0	0	7	0
Total impaired loans, Average Recorded Investment	5,680	2,682	5,168	2,640
Total impaired loans, Interest Income Recognized	6	0	14	3
Commercial and Industrial
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	3,958		3,958		6,072
With no related allowance recorded, Contractual Balance	6,966		6,966		6,264
With no related allowance recorded, Related Allowance	0		0		0
With an allowance recorded, Recorded Investment	123,353		123,353		113,580
With an allowance recorded, Contractual Balance	131,221		131,221		113,862
With an allowance recorded, Related Allowance	20,433		20,433		40,176
Total impaired loans, Recorded Investment	127,311		127,311		119,652
Total impaired loans, Contractual Balance	138,187		138,187		120,126
Total impaired loans, Related Allowance	20,433		20,433		40,176
With no related allowance recorded, Average Recorded Investment	3,929	7,514	5,015	371
With no related allowance recorded, Interest Income Recognized	0	0	0	0
With an allowance recorded, Average Recorded Investment	118,710	16,322	118,466	16,038
With an allowance recorded, Interest Income Recognized	297	0	299	4
Total impaired loans, Average Recorded Investment	122,639	23,836	123,481	16,409
Total impaired loans, Interest Income Recognized	297	0	299	4
Consumer
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	167		167		130
With no related allowance recorded, Contractual Balance	167		167		130
With no related allowance recorded, Related Allowance	0		0		0
With an allowance recorded, Recorded Investment	103		103		14
With an allowance recorded, Contractual Balance	103		103		14
With an allowance recorded, Related Allowance	25		25		13
Total impaired loans, Recorded Investment	270		270		144
Total impaired loans, Contractual Balance	270		270		144
Total impaired loans, Related Allowance	25		25		$ 13
With no related allowance recorded, Average Recorded Investment	94	99	149	163
With no related allowance recorded, Interest Income Recognized	0	0	0	0
With an allowance recorded, Average Recorded Investment	205	1	59	2
With an allowance recorded, Interest Income Recognized	0	0	0	0
Total impaired loans, Average Recorded Investment	299	100	208	165
Total impaired loans, Interest Income Recognized	$ 0	$ 0	$ 0	$ 0

Loans - Summary of Nonaccrual L

Loans - Summary of Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Loans Receivable [Line Items]
Nonaccrual loans	$ 167,310	$ 154,938
Nonaccrual Loans | Construction
Loans Receivable [Line Items]
Nonaccrual loans	12,691	2,633
Nonaccrual Loans | Commercial Real Estate
Loans Receivable [Line Items]
Nonaccrual loans	21,634	27,937
Nonaccrual Loans | Consumer Real Estate
Loans Receivable [Line Items]
Nonaccrual loans	5,948	4,538
Nonaccrual Loans | Commercial and Industrial
Loans Receivable [Line Items]
Nonaccrual loans	126,727	119,705
Nonaccrual Loans | Consumer
Loans Receivable [Line Items]
Nonaccrual loans	$ 310	$ 125

Loans - Summary of Company's Tr

Loans - Summary of Company's Troubled Debt Restructurings ("TDRs") (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Current	$ 2,850	$ 3,283
Greater Than 30 Days Past Due	0	0
Nonaccrual TDRs	116,751	112,257
Total TDRs	119,601	115,540
Total real estate loans
Financing Receivable, Modifications [Line Items]
Current	2,403	2,801
Greater Than 30 Days Past Due	0	0
Nonaccrual TDRs	1,376	2,530
Total TDRs	3,779	5,331
Total real estate loans | Construction
Financing Receivable, Modifications [Line Items]
Current	0	1
Greater Than 30 Days Past Due	0	0
Nonaccrual TDRs	1,249	366
Total TDRs	1,249	367
Total real estate loans | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Current	1,842	2,215
Greater Than 30 Days Past Due	0	0
Nonaccrual TDRs	0	1,393
Total TDRs	1,842	3,608
Total real estate loans | Consumer Real Estate
Financing Receivable, Modifications [Line Items]
Current	561	585
Greater Than 30 Days Past Due	0	0
Nonaccrual TDRs	127	771
Total TDRs	688	1,356
Total other loans | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Current	447	482
Greater Than 30 Days Past Due	0	0
Nonaccrual TDRs	115,375	109,727
Total TDRs	$ 115,822	$ 110,209

Loans - Modification of Trouble

Loans - Modification of Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Receivables [Abstract]
Maturity and interest rate adjustment	$ 0	$ 0
Movement to, or extension of, interest rate-only payments	6,324	0
Other concessions	0	0
Total	$ 6,324	$ 0

Loans - Summary of Informatio52

Loans - Summary of Information Pertaining to Modified Terms of Loans (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016USD ($)contract	Dec. 31, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	21	41
Pre- Modification Outstanding Recorded Investment	$ 119,601	$ 115,540
Post- Modification Outstanding Recorded Investment	$ 119,601	$ 115,540
Construction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	3
Pre- Modification Outstanding Recorded Investment	$ 1,249	$ 367
Post- Modification Outstanding Recorded Investment	$ 1,249	$ 367
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	3
Pre- Modification Outstanding Recorded Investment	$ 1,842	$ 3,608
Post- Modification Outstanding Recorded Investment	$ 1,842	$ 3,608
Consumer Real Estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	5
Pre- Modification Outstanding Recorded Investment	$ 688	$ 1,356
Post- Modification Outstanding Recorded Investment	$ 688	$ 1,356
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	18	30
Pre- Modification Outstanding Recorded Investment	$ 115,822	$ 110,209
Post- Modification Outstanding Recorded Investment	$ 115,822	$ 110,209

Investments in Tax Credit Ent53

Investments in Tax Credit Entities - Narrative (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)investment	Dec. 31, 2015USD ($)
Net Investment Income [Line Items]
Tax credit as Percentage of project cost	39.00%
Assets	$ 4,851,417	$ 4,705,825
Cash and Due from Banks	34,573	50,270
Loans Receivable, Net	3,703,021	3,380,115
Other assets	45,193	32,684
Liabilities	$ 4,446,301	4,325,074
Federal
Net Investment Income [Line Items]
Tax credit as Percentage of project cost	39.00%
Period Of Credit Allowance	7 years
Qualified Equity Investments	$ 118,000
Federal | Maximum
Net Investment Income [Line Items]
Allocation Of Tax Credits Received	$ 46,000
Federal | Due Between One Year And Three Years
Net Investment Income [Line Items]
Investment Credit Percentage Due	5.00%
Federal | Due Between Year Four And Year Seven
Net Investment Income [Line Items]
Investment Credit Percentage Due	6.00%
Federal NMTC | Federal
Net Investment Income [Line Items]
CDE investments in QEI projects located in low-income communities with poverty rates (as a percent)	20.00%
CDE investments in QEI projects located in low-income communities with median family income (as a percent)	80.00%
Allocation Of Tax Credits Received	$ 118,000	$ 118,000
Amortization of tax credit investments	46,000
Bank Owned CDEs | Federal
Net Investment Income [Line Items]
Equity Method Investment, Aggregate Cost	118,000
Assets	132,300
Cash and Due from Banks	7,300
Loans Receivable, Net	112,300
Other assets	12,700
Liabilities	500
Capital	$ 131,800
Community Development Fund | Federal
Net Investment Income [Line Items]
Qualified Equity Investment Percentage Of Proceeds	85.00%
Low-Income Housing Credits
Net Investment Income [Line Items]
Number of investments consolidated | investment	3
Low-Income Housing Credits | Federal
Net Investment Income [Line Items]
Assets	$ 70,200
Other assets	800
Liabilities	5,500
Capital	(25,400)
Parent Company | Bank Owned CDEs | Federal
Net Investment Income [Line Items]
Equity Method Investment, Aggregate Cost	40,000
Other Investors and Leverage Lenders | Bank Owned CDEs | Federal
Net Investment Income [Line Items]
Equity Method Investment, Aggregate Cost	78,000
Leverage Lender | Bank Owned CDEs | Federal
Net Investment Income [Line Items]
Equity Method Investment, Aggregate Cost	$ 17,500
Low-Income Housing Credits
Net Investment Income [Line Items]
Compliance period (years)	15 years
Low-Income Housing Credits | Minimum
Net Investment Income [Line Items]
Federal Tax Credit, Adjustment Period (years)	10 years
Low-Income Housing Credits | Maximum
Net Investment Income [Line Items]
Federal Tax Credit, Adjustment Period (years)	15 years
Federal and State Historic Rehabilitation
Net Investment Income [Line Items]
Compliance period (years)	5 years

Investments in Tax Credit Ent54

Investments in Tax Credit Entities - Schedule of Investments and Tax Benefits (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Net Investment Income [Line Items]
Investment	$ 479,626	$ 451,694
Total Impairment	(127,546)	(97,588)
Loans to Investment Funds	(141,200)	(127,520)
Elimination	(118,000)	(118,000)
Net Investment	92,880	108,586
Tax Benefits Recognized Through Prior Year	161,877	100,593
Tax Benefits Expected to be Recognized in Current Year	73,304	61,284
Tax Benefits Expected to be Recognized in Future Year and Thereafter	67,875	81,998
Total Tax Benefits Earned and to be Recognized	303,056	243,875
Low-Income Housing
Net Investment Income [Line Items]
Investment	30,175	30,166
Total Impairment	(7,177)	(5,979)
Loans to Investment Funds	0	0
Elimination	0	0
Net Investment	22,998	24,187
Low Income Housing Tax Credits Benefits Recognized, Prior Year	17,153	13,188
Low Income Housing Tax Credits Benefits Recognized, Current Year	5,051	3,965
Low Income Housing Tax Credits Benefits Recognizable Year Two And After	33,921	38,972
Total Tax Benefits Earned and to be Recognized	56,125	56,125
Federal and State Historic Rehabilitation
Net Investment Income [Line Items]
Investment	103,428	81,695
Total Impairment	(80,643)	(59,583)
Loans to Investment Funds	0	0
Elimination	0	0
Net Investment	22,785	22,112
Historic Rehabilitation Tax Credits Benefits Recognized, Prior Year	75,305	34,335
Historic Rehabilitation Tax Credits Benefits Recognized, Current Year	51,381	40,970
Historic Rehabilitation Tax Credits Benefits Recognizable Year Two And After	0	0
Total Tax Benefits Earned and to be Recognized	126,686	75,305
Accrued impairment owed to project	500	5,800
Federal
Net Investment Income [Line Items]
Investment	346,023	339,833
Total Impairment	(39,726)	(32,026)
Loans to Investment Funds	(141,200)	(127,520)
Elimination	(118,000)	(118,000)
Net Investment	47,097	62,287
Tax Benefits Recognized Through Prior Year	69,419	53,070
Tax Benefits Expected to be Recognized in Current Year	16,872	16,349
Tax Benefits Expected to be Recognized in Future Year and Thereafter	33,954	43,026
Total Tax Benefits Earned and to be Recognized	120,245	112,445
Federal | Bank Owned CDEs
Net Investment Income [Line Items]
Investment	154,720	154,720
Total Impairment	(11,828)	(8,288)
Loans to Investment Funds	0	0
Elimination	(118,000)	(118,000)
Net Investment	24,892	28,432
Tax Benefits Recognized Through Prior Year	23,070	16,490
Tax Benefits Expected to be Recognized in Current Year	7,080	6,580
Tax Benefits Expected to be Recognized in Future Year and Thereafter	15,870	22,950
Total Tax Benefits Earned and to be Recognized	46,020	46,020
Federal | Non-Bank Owned CDEs
Net Investment Income [Line Items]
Investment	191,303	171,303
Total Impairment	(27,898)	(23,738)
Loans to Investment Funds	(141,200)	(127,520)
Elimination	0	0
Net Investment	22,205	20,045
Tax Benefits Recognized Through Prior Year	46,349	36,580
Tax Benefits Expected to be Recognized in Current Year	9,792	9,769
Tax Benefits Expected to be Recognized in Future Year and Thereafter	18,084	20,076
Total Tax Benefits Earned and to be Recognized	74,225	66,425
Federal | Federal and State Historic Rehabilitation
Net Investment Income [Line Items]
Investment	89,991	69,177
Total Impairment	(76,280)	(55,220)
Loans to Investment Funds	0	0
Elimination	0	0
Net Investment	13,711	13,957
Historic Rehabilitation Tax Credits Benefits Recognized, Prior Year	75,305	34,335
Historic Rehabilitation Tax Credits Benefits Recognized, Current Year	51,381	40,970
Historic Rehabilitation Tax Credits Benefits Recognizable Year Two And After	0	0
Total Tax Benefits Earned and to be Recognized	126,686	75,305
Federal | Federal NMTC
Net Investment Income [Line Items]
Allocation Of Tax Credits Received	118,000	118,000
Federal | Federal Rehabilitation Tax Credit
Net Investment Income [Line Items]
Net Investment	2,600	10,900
Outstanding commitments to invest in Federal Historic Rehabilitation tax credit projects	23,000	39,100
State
Net Investment Income [Line Items]
Investment		13,810
Total Impairment		0
Loans to Investment Funds		0
Elimination		0
Net Investment		13,810
Tax Benefits Recognized Through Prior Year		0
Tax Benefits Expected to be Recognized in Current Year		0
Tax Benefits Expected to be Recognized in Future Year and Thereafter		0
Total Tax Benefits Earned and to be Recognized		0
State | State Rehabilitation Tax Credit
Net Investment Income [Line Items]
Investment	13,437	12,518
Total Impairment	(4,363)	(4,363)
Loans to Investment Funds	0	0
Elimination	0	0
Net Investment	9,074	8,155
Historic Rehabilitation Tax Credits Benefits Recognized, Prior Year	0	0
Historic Rehabilitation Tax Credits Benefits Recognized, Current Year	0	0
Historic Rehabilitation Tax Credits Benefits Recognizable Year Two And After	0	0
Total Tax Benefits Earned and to be Recognized	$ 0	$ 0

Investments in Tax Credit Ent55

Investments in Tax Credit Entities - Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Investment Income [Line Items]
Impairment of tax credit investments	$ 14,716	$ 11,661	$ 29,431	$ 25,008
Federal NMTC
Net Investment Income [Line Items]
Impairment of tax credit investments	3,850	3,703	7,700	7,406
Federal Low-Income Housing
Net Investment Income [Line Items]
Impairment of tax credit investments	599	(765)	1,198	158
Federal and State Historic Rehabilitation
Net Investment Income [Line Items]
Impairment of tax credit investments	$ 10,267	$ 8,723	$ 20,533	$ 17,444

Investments in Tax Credit Ent56

Investments in Tax Credit Entities - Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Net Investment Income [Line Items]
Loans Receivable, Real Estate	$ 282,662	$ 228,930
Construction
Net Investment Income [Line Items]
Loans Receivable, Real Estate	59,110	43,962
Commercial Real Estate
Net Investment Income [Line Items]
Loans Receivable, Real Estate	78,351	67,579
Commercial and Industrial
Net Investment Income [Line Items]
Loans Receivable, Real Estate	$ 145,201	$ 117,389

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Assets	$ 4,851,417	$ 4,705,825
Real estate	77,976	80,666
Other assets	45,193	32,684
Liabilities	4,446,301	$ 4,325,074
Low-Income Housing Credits | Federal
Variable Interest Entity [Line Items]
Assets	70,200
Real estate	69,400
Other assets	800
Liabilities	5,500
Capital	$ (25,400)

Borrowings (Details)

Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Total short-term borrowings	$ 7,022	$ 8,000
FHLB
Short-term Debt [Line Items]
Total short-term borrowings	$ 7,022	$ 8,000

Borrowings - Narrative (Details

Borrowings - Narrative (Details) - USD ($) $ in Thousands	Mar. 21, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Weighted average interest rate on advances		0.85%
Short-term borrowings paid off	$ 2,000
Long-term borrowings		$ 295,130		$ 279,042
State of Louisiana Office of Community Development
Short-term Debt [Line Items]
Long-term borrowings			$ 19,100
Stated interest rate			1.00%

Derivative - Interest Rate Sw60

Derivative - Interest Rate Swap Agreements - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2016USD ($)swap	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)swap	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)swap	Mar. 31, 2016USD ($)contract	Dec. 31, 2014contract	Dec. 31, 2014swap	Dec. 31, 2012USD ($)
Interest Rate Derivatives Outstanding [Line Items]
Unrealized gains (losses) on cash flow hedges, before tax		$ (5,287,000)	$ 6,736,000	$ (13,232,000)	$ 3,229,000
Amount of derivative will mature within next 12 months		0		0
Interest rate swaps
Interest Rate Derivatives Outstanding [Line Items]
Notional amount of derivative contract		425,000,000		425,000,000
Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Notional amount of derivative contract		315,000,000		315,000,000
Counterparty C
Interest Rate Derivatives Outstanding [Line Items]
Financial instruments owned and pledged as collateral		6,200,000		6,200,000
Financial instruments owned and pledged as collateral at fair value		6,700,000		6,700,000
Amounts of gains or losses have been reclassified from accumulated comprehensive income		0	0	0	0
Counterparty C | Interest Rate Swap, Fixed Interest Rate of 0.940% and 1.06%
Interest Rate Derivatives Outstanding [Line Items]
Number of interest rate swaps | contract									2
Notional amount of derivative contract									$ 110,000,000
Counterparty C | Interest Rate Swap, Fixed Interest Rate of 0.940%
Interest Rate Derivatives Outstanding [Line Items]
Notional amount of derivative contract		$ 55,000,000		$ 55,000,000					$ 55,000,000
Fixed Rate		0.94%		0.94%					0.94%
Counterparty C | Interest Rate Swap, Fixed Interest Rate of 1.060%
Interest Rate Derivatives Outstanding [Line Items]
Notional amount of derivative contract		$ 55,000,000		$ 55,000,000
Fixed Rate		1.06%		1.06%					1.06%
Counterparty C | Interest rate swaps
Interest Rate Derivatives Outstanding [Line Items]
Number of interest rate swaps										3	3
Notional amount of derivative contract		$ 275,000,000		$ 275,000,000			$ 165,000,000
Counterparty C | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Number of interest rate swaps | swap						6
Notional amount of derivative contract	$ 10,000,000	135,000,000		135,000,000
Unrealized gains (losses) on cash flow hedges, before tax	$ 300,000
Number of Interest Rate Derivatives Terminated | swap	1
Counterparty C | Prime plus 1% | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Debt instrument basis spread on variable rate (as a percent)						1.00%
Counterparty C | Prime plus 1% floored at 5% | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Debt instrument basis spread on variable rate (as a percent)						1.00%
Debt instrument interest floored rate (as a percent)						5.00%
Counterparty C | Prime plus 2%, One | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Debt instrument basis spread on variable rate (as a percent)						2.00%
Counterparty C | Prime plus 2%, Two | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Debt instrument basis spread on variable rate (as a percent)						2.00%
Counterparty C | Prime plus 2.25% | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Debt instrument basis spread on variable rate (as a percent)						2.25%
Counterparty A
Interest Rate Derivatives Outstanding [Line Items]
Amounts of gains or losses have been reclassified from accumulated comprehensive income		300,000	300,000	600,000	500,000
Counterparty A | Interest rate swaps
Interest Rate Derivatives Outstanding [Line Items]
Notional amount of derivative contract												$ 115,000,000
Unrealized gains (losses) on cash flow hedges, before tax							$ (8,000,000)
Counterparty B
Interest Rate Derivatives Outstanding [Line Items]
Financial instruments owned and pledged as collateral		28,700,000		28,700,000
Financial instruments owned and pledged as collateral at fair value		29,700,000		29,700,000
Amounts of gains or losses have been reclassified from accumulated comprehensive income		100,000	$ 0	200,000	$ 0
Counterparty B | Interest rate swaps
Interest Rate Derivatives Outstanding [Line Items]
Notional amount of derivative contract		150,000,000		150,000,000				$ 150,000,000
Counterparty B | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Number of interest rate swaps | swap								4
Notional amount of derivative contract		180,000,000		180,000,000		$ 70,000,000
Unrealized gains (losses) on cash flow hedges, before tax						$ 1,300,000
Number of Interest Rate Derivatives Terminated | swap						2
Counterparty B | Prime plus 1% | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Debt instrument basis spread on variable rate (as a percent)								1.00%
Counterparty B | Prime plus 1% floored at 5% | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Debt instrument basis spread on variable rate (as a percent)								1.00%
Debt instrument interest floored rate (as a percent)								5.00%
Counterparty B | Prime plus 1% floored at 5.5% | Interest rate-prime swaps
Interest Rate Derivatives Outstanding [Line Items]
Notional amount of derivative contract		$ 180,000,000		$ 180,000,000
Debt instrument basis spread on variable rate (as a percent)								1.00%
Debt instrument interest floored rate (as a percent)								5.50%

Derivative - Interest Rate Sw61

Derivative - Interest Rate Swap Agreements - Summary of Interest Rate Swaps (Details) - USD ($)	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 425,000,000
Counterparty B | Interest Rate Swap, Fixed Interest Rate of 4.165%
Derivative [Line Items]
Notional Amount	$ 150,000,000
Fixed Payment Rate	4.165%
Counterparty B | Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 150,000,000			$ 150,000,000
Counterparty C | Interest rate swaps
Derivative [Line Items]
Notional Amount	275,000,000		$ 165,000,000
Counterparty C | Interest Rate Swap, Fixed Interest Rate of 2.652%
Derivative [Line Items]
Notional Amount	$ 55,000,000
Fixed Payment Rate	2.652%
Counterparty C | Interest Rate Swap, Fixed Interest Rate of 2.753%
Derivative [Line Items]
Notional Amount	$ 55,000,000
Fixed Payment Rate	2.753%
Counterparty C | Interest Rate Swap, Fixed Interest Rate of 2.793%
Derivative [Line Items]
Notional Amount	$ 55,000,000
Fixed Payment Rate	2.793%
Counterparty C | Interest Rate Swap, Fixed Interest Rate of 0.940%
Derivative [Line Items]
Notional Amount	$ 55,000,000	$ 55,000,000
Fixed Payment Rate	0.94%	0.94%
Counterparty C | Interest Rate Swap, Fixed Interest Rate of 1.060%
Derivative [Line Items]
Notional Amount	$ 55,000,000
Fixed Payment Rate	1.06%	1.06%

Derivative - Interest Rate Sw62

Derivative - Interest Rate Swap Agreements - Summary of Prime Swaps (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	May 31, 2016	Dec. 31, 2015
Interest rate-prime swaps
Derivative [Line Items]
Notional Amount	$ 315,000,000
Counterparty B | Prime Swap, Fixed Rate of 6.010%
Derivative [Line Items]
Notional Amount	$ 100,000,000
Fixed Rate	6.01%
Counterparty B | Prime Swap, Fixed Rate of 6.260%
Derivative [Line Items]
Notional Amount	$ 80,000,000
Fixed Rate	6.26%
Counterparty B | Interest rate-prime swaps
Derivative [Line Items]
Notional Amount	$ 180,000,000		$ 70,000,000
Counterparty C | Interest rate-prime swaps
Derivative [Line Items]
Notional Amount	135,000,000	$ 10,000,000
Counterparty C | Prime Swap, Fixed Rate of 4.500%
Derivative [Line Items]
Notional Amount	$ 30,000,000
Fixed Rate	4.50%
Counterparty C | Prime Swap, Fixed Rate of 5.490%
Derivative [Line Items]
Notional Amount	$ 40,000,000
Fixed Rate	5.49%
Counterparty C | Prime Swap, Fixed Rate of 5.810%
Derivative [Line Items]
Notional Amount	$ 40,000,000
Fixed Rate	5.81%
Counterparty C | Prime Swap, Fixed Rate of 6.560%, Swap 1
Derivative [Line Items]
Notional Amount	$ 15,000,000
Fixed Rate	6.56%
Counterparty C | Prime Swap, Fixed Rate of 6.560%, Swap 2
Derivative [Line Items]
Notional Amount	$ 10,000,000
Fixed Rate	6.56%
Prime Rate
Derivative [Line Items]
Debt instrument interest floored rate (as a percent)	5.00%
Prime Rate | Counterparty B | Prime Swap, Fixed Rate of 6.010%
Derivative [Line Items]
Debt instrument basis spread on variable rate (as a percent)	1.00%
Debt instrument interest floored rate (as a percent)	5.00%
Prime Rate | Counterparty B | Prime Swap, Fixed Rate of 6.260%
Derivative [Line Items]
Debt instrument basis spread on variable rate (as a percent)	1.00%
Debt instrument interest floored rate (as a percent)	5.50%
Prime Rate | Counterparty C | Prime Swap, Fixed Rate of 5.490%
Derivative [Line Items]
Debt instrument basis spread on variable rate (as a percent)	1.00%
Prime Rate | Counterparty C | Prime Swap, Fixed Rate of 5.810%
Derivative [Line Items]
Debt instrument basis spread on variable rate (as a percent)	1.00%
Prime Rate | Counterparty C | Prime Swap, Fixed Rate of 6.560%, Swap 1
Derivative [Line Items]
Debt instrument basis spread on variable rate (as a percent)	2.00%
Prime Rate | Counterparty C | Prime Swap, Fixed Rate of 6.560%, Swap 2
Derivative [Line Items]
Debt instrument basis spread on variable rate (as a percent)	2.00%
Prime Rate | Counterparty C | Prime Swap, Fixed Rate of 6.810%
Derivative [Line Items]
Debt instrument basis spread on variable rate (as a percent)	2.25%

Derivative - Interest Rate Sw63

Derivative - Interest Rate Swap Agreements - Derivative Instruments at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Liabilities Fair Value	$ 33,589	$ 19,700
Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets Fair Value	10,768	4,356
Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities Fair Value	44,357	24,056
Counterparty B | Interest rate swaps | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets Fair Value	0	0
Counterparty B | Interest rate swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities Fair Value	31,046	20,613
Counterparty B | Interest rate-prime swaps | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets Fair Value	5,172	3,815
Counterparty B | Interest rate-prime swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities Fair Value	0	0
Counterparty C | Interest rate swaps | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets Fair Value	0	0
Counterparty C | Interest rate swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities Fair Value	13,311	3,037
Counterparty C | Interest rate-prime swaps | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets Fair Value	5,596	541
Counterparty C | Interest rate-prime swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities Fair Value	$ 0	$ 406

Derivative - Interest Rate Sw64

Derivative - Interest Rate Swap Agreements - Master Netting Arrangement (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative liabilities:
Gross Amounts Presented in the Balance Sheet	$ 33,589	$ 19,700
Gross Amounts Not Offset in the Balance Sheet, Derivatives	0	0
Gross Amounts Not Offset in the Balance Sheet, Collateral	0	0
Net	33,589	19,700
Interest Rate Swap and Prime Swaps | Counterparty B
Derivative liabilities:
Gross Amounts Presented in the Balance Sheet	25,874	16,798
Gross Amounts Not Offset in the Balance Sheet, Derivatives	0	0
Gross Amounts Not Offset in the Balance Sheet, Collateral	0	0
Net	25,874	16,798
Interest Rate Swap and Prime Swaps | Counterparty C
Derivative liabilities:
Gross Amounts Presented in the Balance Sheet	7,715	2,902
Gross Amounts Not Offset in the Balance Sheet, Derivatives	0	0
Gross Amounts Not Offset in the Balance Sheet, Collateral	0	0
Net	$ 7,715	$ 2,902

Derivative - Interest Rate Sw65

Derivative - Interest Rate Swap Agreements - Effect of Hedging Instruments (Details) - Cash Flow Hedging - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion)	$ (25,092)	$ (11,492)
Interest rate swaps | Counterparty A
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion)	(4,124)	(4,844)
Interest Rate Swap and Prime Swaps | Counterparty B
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion)	(16,120)	(7,592)
Interest Rate Swap and Prime Swaps | Counterparty C
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion)	$ (4,848)	$ 944

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Benefit on Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current tax expense	$ 293	$ 831	$ 1,134	$ 1,911
Deferred tax benefit	(4,343)	(19,427)	(45,054)	(35,191)
Total tax benefit	(4,050)	$ (18,596)	(43,920)	$ (33,280)
Deferred tax assets, valuation allowance	$ 1,600		$ 1,600		$ 1,500

Commitments and Contingencies -

Commitments and Contingencies - Summary of Total Notional Amount of Loan Commitments and Standby Letters of Credit (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Liability for Losses on Unfunded Commitments	$ 300	$ 300
Standby letters of credit	140,668	106,232
Unused loan commitments	717,682	715,759
Total	$ 858,350	$ 821,991

Accumulated Other Comprehensi68

Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			$ (21,385)
Other comprehensive income (loss) before income taxes:
Reclassification of net losses realized and included in earnings	$ 193	$ 273	394	$ 539
Reclassification of net losses realized and included in earnings	0	0	0	0
Income tax expense (benefit)	(1,164)	1,256	(2,041)	1,397
Ending balance	(25,171)		(25,171)
Cash Flow Hedges
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			(12,806)	(8,396)
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain			(13,889)	2,690
Reclassification of net losses realized and included in earnings			0
Reclassification of net losses realized and included in earnings				0
Amortization of unrealized net gain			0	0
Income tax expense (benefit)			(4,769)	942
Ending balance	(21,926)	(6,648)	(21,926)	(6,648)
Terminated Cash Flow Hedge
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			(3,685)	(5,194)
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain			263	0
Reclassification of net losses realized and included in earnings			394
Reclassification of net losses realized and included in earnings				539
Amortization of unrealized net gain			0	0
Income tax expense (benefit)			138	189
Ending balance	(3,166)	(4,844)	(3,166)	(4,844)
Transfers of Available for Sale Securities to Held to Maturity
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			(2,926)	(3,354)
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain			0	0
Reclassification of net losses realized and included in earnings			0
Reclassification of net losses realized and included in earnings				0
Amortization of unrealized net gain			303	288
Income tax expense (benefit)			106	101
Ending balance	(2,729)	(3,167)	(2,729)	(3,167)
Available for Sale Securities
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			(1,968)	(2,793)
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain			7,102	472
Reclassification of net losses realized and included in earnings			0
Reclassification of net losses realized and included in earnings				0
Amortization of unrealized net gain			0	0
Income tax expense (benefit)			2,484	165
Ending balance	2,650	(2,486)	2,650	(2,486)
Accumulated Other Comprehensive Income
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			(21,385)	(19,737)
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain			(6,524)	3,162
Reclassification of net losses realized and included in earnings			394
Reclassification of net losses realized and included in earnings				539
Amortization of unrealized net gain			303	288
Income tax expense (benefit)			(2,041)	1,397
Ending balance	$ (25,171)	$ (17,145)	$ (25,171)	$ (17,145)

Capital Requirements and Othe69

Capital Requirements and Other Regulatory Matters (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
First NBC Bank Holding Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage capital, Actual, Ratio (as a percent)	5.97%	6.03%
Tier 1 risk-based capital, Actual, Ratio (as a percent)	6.41%	6.33%
Total risk-based capital, Actual, Ratio (as a percent)	9.03%	9.04%
Common equity tier 1 risk-based capital, Actual, Ratio (as a percent)	6.41%	6.33%
Tier 1 leverage capital, Actual, Amount	$ 281,298	$ 265,191
Tier 1 risk-based capital, Actual, Amount	281,298	265,191
Total risk-based capital, Actual, Amount	396,079	378,815
Common equity tier 1 risk-based capital, Actual, Amount	$ 281,298	$ 265,191
First NBC Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage capital, Actual, Ratio (as a percent)	7.26%	7.44%
Tier 1 risk-based capital, Actual, Ratio (as a percent)	7.78%	7.68%
Total risk-based capital, Actual, Ratio (as a percent)	9.05%	8.96%
Common equity tier 1 risk-based capital, Actual, Ratio (as a percent)	7.78%	7.68%
Tier 1 leverage capital, Actual, Amount	$ 340,612	$ 321,346
Tier 1 risk-based capital, Actual, Amount	340,612	321,346
Total risk-based capital, Actual, Amount	396,439	374,976
Common equity tier 1 risk-based capital, Actual, Amount	$ 340,612	$ 321,346
Tier 1 leverage capital, Well Capitalized Minimum (as a percent)	5.00%	5.00%
Tier 1 risk-based capital, Well Capitalized Minimum (as a percent)	8.00%	8.00%
Total risk-based capital, Well Capitalized Minimum (as a percent)	10.00%	10.00%
Common equity tier 1 risk-based capital, Well Capitalized Minimum (as a percent)	6.50%	6.50%

Fair Value of Financial Instr70

Fair Value of Financial Instruments - Carrying Value and Fair Value Measurements of Financial Assets and Liabilities on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available for sale:
Investment securities available for sale	$ 301,279	$ 285,826
U.S. government agency securities
Available for sale:
Investment securities available for sale	149,449	149,675
U.S. Treasury securities
Available for sale:
Investment securities available for sale	13,128	12,703
Municipal securities
Available for sale:
Investment securities available for sale	12,127	12,100
Mortgage-backed securities
Available for sale:
Investment securities available for sale	118,507	77,511
Corporate bonds
Available for sale:
Investment securities available for sale	8,048	7,823
Other equity securities
Available for sale:
Investment securities available for sale	20	20
Other debt securities
Available for sale:
Investment securities available for sale		25,994
Quoted Prices in Active Markets for Identical Assets ( Level 1)
Available for sale:
Investment securities available for sale	20	20
Liabilities
Derivative instruments	0	0
Significant Other Observable Inputs (Level 2)
Available for sale:
Investment securities available for sale	301,259	285,806
Liabilities
Derivative instruments	33,589	19,700
Significant Unobservable Inputs (Level 3)
Available for sale:
Investment securities available for sale	0	0
Liabilities
Derivative instruments	0	0
Fair Value, Measurements, Recurring
Available for sale:
Total	301,279	285,826
Liabilities
Derivative instruments	33,589	19,700
Fair Value, Measurements, Recurring | U.S. government agency securities
Available for sale:
Investment securities available for sale	149,449	149,675
Fair Value, Measurements, Recurring | U.S. Treasury securities
Available for sale:
Investment securities available for sale	13,128	12,703
Fair Value, Measurements, Recurring | Municipal securities
Available for sale:
Investment securities available for sale	12,127	12,100
Fair Value, Measurements, Recurring | Mortgage-backed securities
Available for sale:
Investment securities available for sale	118,507	77,511
Fair Value, Measurements, Recurring | Corporate bonds
Available for sale:
Investment securities available for sale	8,048	7,823
Fair Value, Measurements, Recurring | Other equity securities
Available for sale:
Investment securities available for sale	20	20
Fair Value, Measurements, Recurring | Other debt securities
Available for sale:
Investment securities available for sale		25,994
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets ( Level 1)
Available for sale:
Total	20	20
Liabilities
Derivative instruments	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets ( Level 1) | U.S. government agency securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets ( Level 1) | U.S. Treasury securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets ( Level 1) | Municipal securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets ( Level 1) | Mortgage-backed securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets ( Level 1) | Corporate bonds
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets ( Level 1) | Other equity securities
Available for sale:
Investment securities available for sale	20	20
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets ( Level 1) | Other debt securities
Available for sale:
Investment securities available for sale		0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Available for sale:
Total	301,259	285,806
Liabilities
Derivative instruments	33,589	19,700
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency securities
Available for sale:
Investment securities available for sale	149,449	149,675
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
Available for sale:
Investment securities available for sale	13,128	12,703
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities
Available for sale:
Investment securities available for sale	12,127	12,100
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Available for sale:
Investment securities available for sale	118,507	77,511
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds
Available for sale:
Investment securities available for sale	8,048	7,823
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other equity securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other debt securities
Available for sale:
Investment securities available for sale		25,994
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Available for sale:
Total	0	0
Liabilities
Derivative instruments	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate bonds
Available for sale:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other equity securities
Available for sale:
Investment securities available for sale	$ 0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other debt securities
Available for sale:
Investment securities available for sale		$ 0

Fair Value of Financial Instr71

Fair Value of Financial Instruments - Carrying Value and Fair Value Measurements of Financial Assets and Liabilities on Non Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Loans	$ 147,957	$ 134,755
OREO	2,460	3,701
Investment in tax credit entities	6,233	1,425
Total	156,650	139,881
Quoted Prices in Active Markets for Identical Assets ( Level 1)
Assets
Loans	0	0
OREO	0	0
Investment in tax credit entities	0	0
Total	0	0
Significant Other Observable Inputs (Level 2)
Assets
Loans	0	0
OREO	0	0
Investment in tax credit entities	0	0
Total	0	0
Significant Unobservable Inputs (Level 3)
Assets
Loans	147,957	134,755
OREO	2,460	3,701
Investment in tax credit entities	6,233	1,425
Total	$ 156,650	$ 139,881

Fair Value of Financial Instr72

Fair Value of Financial Instruments - Carrying Value and Fair Value Measurements of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial Assets:
Noninterest-bearing	$ 34,573	$ 50,270
Investment in short-term receivables	0	25,604
Investment securities available for sale	301,279	285,826
Investment securities held to maturity	85,442	82,800
Loans and loans held for sale	3,198	2,597
Financial Liabilities:
Deposits, noninterest-bearing	381,553	368,421
Deposits, interest-bearing	3,550,471	3,475,421
Repurchase agreements	85,757	79,251
Short-term borrowings	7,022	8,000
Long-term borrowings	295,130	279,042
Quoted Prices in Active Markets for Identical Assets ( Level 1)
Financial Assets:
Noninterest-bearing	146,011	349,054
Investment in short-term receivables		25,604
Investment securities available for sale	20	20
Investment securities held to maturity	0	0
Loans and loans held for sale	0	0
Financial Liabilities:
Deposits, noninterest-bearing	0	0
Deposits, interest-bearing	0	0
Repurchase agreements	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Derivative instruments	0	0
Significant Other Observable Inputs (Level 2)
Financial Assets:
Noninterest-bearing	0	0
Investment in short-term receivables		0
Investment securities available for sale	301,259	285,806
Investment securities held to maturity	85,442	82,799
Loans and loans held for sale	0	0
Financial Liabilities:
Deposits, noninterest-bearing	381,553	368,421
Deposits, interest-bearing	0	0
Repurchase agreements	85,757	79,251
Short-term borrowings	7,027	7,994
Long-term borrowings	360,921	341,033
Derivative instruments	33,589	19,700
Significant Unobservable Inputs (Level 3)
Financial Assets:
Noninterest-bearing	0	0
Investment in short-term receivables		0
Investment securities available for sale	0	0
Investment securities held to maturity	0	0
Loans and loans held for sale	3,766,902	3,444,920
Financial Liabilities:
Deposits, noninterest-bearing	0	0
Deposits, interest-bearing	3,543,587	3,403,261
Repurchase agreements	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Derivative instruments	0	0
Carrying Amount
Financial Assets:
Noninterest-bearing	146,011	349,054
Investment in short-term receivables		25,604
Investment securities available for sale	301,279	285,826
Investment securities held to maturity	79,598	82,074
Loans and loans held for sale	3,783,183	3,466,268
Financial Liabilities:
Deposits, noninterest-bearing	381,553	368,421
Deposits, interest-bearing	3,550,471	3,475,421
Repurchase agreements	85,757	79,251
Short-term borrowings	7,022	8,000
Long-term borrowings	355,130	339,042
Derivative instruments	33,589	19,700
Total Fair Value
Financial Assets:
Noninterest-bearing	146,011	349,054
Investment in short-term receivables		25,604
Investment securities available for sale	301,279	285,826
Investment securities held to maturity	85,442	82,799
Loans and loans held for sale	3,766,902	3,444,920
Financial Liabilities:
Deposits, noninterest-bearing	381,553	368,421
Deposits, interest-bearing	3,543,587	3,403,261
Repurchase agreements	85,757	79,251
Short-term borrowings	7,027	7,994
Long-term borrowings	360,921	341,033
Derivative instruments	$ 33,589	$ 19,700