Fair Value Measurement of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Available for sale	$ 1,297,373	$ 1,506,861
Liabilities
Foreclosed assets	10,600	19,000
Loans held for sale (which consist of residential mortgages) carried at fair value	58,200	16,100
Covered other real estate	300	4,200
U.S. Treasury securities
Assets
Available for sale	49,591	549,473
U.S. government agency securities
Assets
Available for sale	23,041	29,963
Obligations of states and political subdivisions
Assets
Available for sale	119,767	124,966
Residential mortgage-backed securities
Assets
Available for sale	1,015,542	696,428
Trust preferred securities
Assets
Available for sale	8,009	8,404
Corporate and other debt securities
Assets
Available for sale	60,565	77,552
Equity securities
Assets
Available for sale	20,858	20,075
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements
Assets
Available for sale	58,961	568,381
Loans held for sale	0	0
Other assets	0	0
Total assets	58,961	568,381
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| U.S. Treasury securities
Assets
Available for sale	49,591	549,473
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| U.S. government agency securities
Assets
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Assets
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Residential mortgage-backed securities
Assets
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Trust preferred securities
Assets
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Corporate and other debt securities
Assets
Available for sale	8,064	17,710
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Equity securities
Assets
Available for sale	1,306	1,198
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-recurring fair value measurements
Liabilities
Collateral dependent impaired loans	0	0
Loan servicing rights	0	0
Foreclosed assets	0	0
Total	0	0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements
Assets
Available for sale	1,226,524	924,687
Loans held for sale	57,708	16,382
Other assets	29,055	33,774
Total assets	1,313,287	974,843
Liabilities
Other liabilities	44,077	50,844
Total liabilities	44,077	50,844
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| U.S. Treasury securities
Assets
Available for sale	0	0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| U.S. government agency securities
Assets
Available for sale	23,041	29,963
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Assets
Available for sale	119,767	124,966
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Residential mortgage-backed securities
Assets
Available for sale	1,005,589	684,777
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Trust preferred securities
Assets
Available for sale	6,074	6,262
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Corporate and other debt securities
Assets
Available for sale	52,501	59,842
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Equity securities
Assets
Available for sale	19,552	18,877
Significant Other Observable Inputs (Level 2) \| Non-recurring fair value measurements
Liabilities
Collateral dependent impaired loans	0	0
Loan servicing rights	0	0
Foreclosed assets	0	0
Total	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements
Assets
Available for sale	11,888	13,793
Loans held for sale	0	0
Other assets	0	0
Total assets	11,888	13,793
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| U.S. Treasury securities
Assets
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| U.S. government agency securities
Assets
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Assets
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Residential mortgage-backed securities
Assets
Available for sale	9,953	11,651
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Trust preferred securities
Assets
Available for sale	1,935	2,142
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Corporate and other debt securities
Assets
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Equity securities
Assets
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Non-recurring fair value measurements
Liabilities
Collateral dependent impaired loans	5,385	15,427
Loan servicing rights	6,489	2,571
Foreclosed assets	4,532	16,672
Total	16,406	34,670
Fair Value \| Recurring fair value measurements
Assets
Available for sale	1,297,373	1,506,861
Loans held for sale	57,708	16,382
Other assets	29,055	33,774
Total assets	1,384,136	1,557,017
Liabilities
Other liabilities	44,077	50,844
Total liabilities	44,077	50,844
Fair Value \| Recurring fair value measurements \| U.S. Treasury securities
Assets
Available for sale	49,591	549,473
Fair Value \| Recurring fair value measurements \| U.S. government agency securities
Assets
Available for sale	23,041	29,963
Fair Value \| Recurring fair value measurements \| Obligations of states and political subdivisions
Assets
Available for sale	119,767	124,966
Fair Value \| Recurring fair value measurements \| Residential mortgage-backed securities
Assets
Available for sale	1,015,542	696,428
Fair Value \| Recurring fair value measurements \| Trust preferred securities
Assets
Available for sale	8,009	8,404
Fair Value \| Recurring fair value measurements \| Corporate and other debt securities
Assets
Available for sale	60,565	77,552
Fair Value \| Recurring fair value measurements \| Equity securities
Assets
Available for sale	20,858	20,075
Fair Value \| Non-recurring fair value measurements
Liabilities
Collateral dependent impaired loans	5,385	15,427
Loan servicing rights	6,489	2,571
Foreclosed assets	4,532	16,672
Total	$ 16,406	$ 34,670

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Carrying amount of other real estate covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

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This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans).

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Fair value of the collateral dependent impaired loans.

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Non-recurring fair value measurements, asset liability, total.

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Total assets fair value disclosure

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Total liabilities fair value disclosure

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