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, 2017	Dec. 31, 2016
Assets
Available for sale	$ 1,493,905	$ 1,297,373
Liabilities
Foreclosed assets	9,800	10,200
Loans held for sale (which consist of residential mortgages) carried at fair value	14,800	58,200
U.S. Treasury securities
Assets
Available for sale	49,642	49,591
U.S. government agency securities
Assets
Available for sale	42,505	23,041
Obligations of states and political subdivisions
Assets
Available for sale	112,884	119,767
Residential mortgage-backed securities
Assets
Available for sale	1,223,295	1,015,542
Trust preferred securities
Assets
Available for sale	3,214	8,009
Corporate and other debt securities
Assets
Available for sale	51,164	60,565
Equity securities
Assets
Available for sale	11,201	20,858
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements
Assets
Available for sale	58,807	58,961
Loans held for sale	0	0
Other assets	0	0
Total assets	58,807	58,961
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	49,642	49,591
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	7,783	8,064
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Equity securities
Assets
Available for sale	1,382	1,306
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	1,427,738	1,226,524
Loans held for sale	15,119	57,708
Other assets	26,417	29,055
Total assets	1,469,274	1,313,287
Liabilities
Other liabilities	24,330	44,077
Total liabilities	24,330	44,077
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	42,505	23,041
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Assets
Available for sale	112,884	119,767
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Residential mortgage-backed securities
Assets
Available for sale	1,215,935	1,005,589
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Trust preferred securities
Assets
Available for sale	3,214	6,074
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Corporate and other debt securities
Assets
Available for sale	43,381	52,501
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Equity securities
Assets
Available for sale	9,819	19,552
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	7,360	11,888
Loans held for sale	0	0
Other assets	0	0
Total assets	7,360	11,888
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	7,360	9,953
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Trust preferred securities
Assets
Available for sale	0	1,935
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	48,373	5,385
Loan servicing rights	5,350	6,489
Foreclosed assets	3,472	4,532
Total	57,195	16,406
Fair Value \| Recurring fair value measurements
Assets
Available for sale	1,493,905	1,297,373
Loans held for sale	15,119	57,708
Other assets	26,417	29,055
Total assets	1,535,441	1,384,136
Liabilities
Other liabilities	24,330	44,077
Total liabilities	24,330	44,077
Fair Value \| Recurring fair value measurements \| U.S. Treasury securities
Assets
Available for sale	49,642	49,591
Fair Value \| Recurring fair value measurements \| U.S. government agency securities
Assets
Available for sale	42,505	23,041
Fair Value \| Recurring fair value measurements \| Obligations of states and political subdivisions
Assets
Available for sale	112,884	119,767
Fair Value \| Recurring fair value measurements \| Residential mortgage-backed securities
Assets
Available for sale	1,223,295	1,015,542
Fair Value \| Recurring fair value measurements \| Trust preferred securities
Assets
Available for sale	3,214	8,009
Fair Value \| Recurring fair value measurements \| Corporate and other debt securities
Assets
Available for sale	51,164	60,565
Fair Value \| Recurring fair value measurements \| Equity securities
Assets
Available for sale	11,201	20,858
Fair Value \| Non-recurring fair value measurements
Liabilities
Collateral dependent impaired loans	48,373	5,385
Loan servicing rights	5,350	6,489
Foreclosed assets	3,472	4,532
Total	$ 57,195	$ 16,406

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

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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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 liabilities fair value disclosure

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