Fair Value Measurement of Assets and Liabilities - Assets and Liabilities Measured at Recurring and Non-Recurring Basis (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Investment securities:
Available for sale	$ 1,454,331,000	$ 1,297,373,000
Loans held for sale	11,184,000	57,708,000
Non-recurring fair value measurements:
Unpaid principal balances of loans held for sale	11,200,000	58,200,000
Covered real estate owned	0	558,000
U.S. Treasury securities
Investment securities:
Available for sale	49,780,000	49,591,000
U.S. government agency securities
Investment securities:
Available for sale	47,275,000	23,041,000
Obligations of states and political subdivisions
Investment securities:
Available for sale	119,162,000	119,767,000
Residential mortgage-backed securities
Investment securities:
Available for sale	1,158,064,000	1,015,542,000
Trust preferred securities
Investment securities:
Available for sale	6,393,000	8,009,000
Corporate and other debt securities
Investment securities:
Available for sale	62,717,000	60,565,000
Equity securities
Investment securities:
Available for sale	10,940,000	20,858,000
Non-recurring fair value measurements
Non-recurring fair value measurements:
Covered real estate owned	0	300,000
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements
Investment securities:
Available for sale	58,882,000	58,961,000
Loans held for sale	0	0
Other assets	0	0
Total assets	58,882,000	58,961,000
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
Investment securities:
Available for sale	49,780,000	49,591,000
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| U.S. government agency securities
Investment securities:
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
Investment securities:
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Residential mortgage-backed securities
Investment securities:
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Trust preferred securities
Investment securities:
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Corporate and other debt securities
Investment securities:
Available for sale	8,009,000	8,064,000
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Equity securities
Investment securities:
Available for sale	1,093,000	1,306,000
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-recurring fair value measurements
Non-recurring fair value measurements:
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
Investment securities:
Available for sale	1,384,082,000	1,226,524,000
Loans held for sale	11,184,000	57,708,000
Other assets	25,466,000	29,055,000
Total assets	1,420,732,000	1,313,287,000
Liabilities
Other liabilities	23,231,000	44,077,000
Total liabilities	23,231,000	44,077,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| U.S. Treasury securities
Investment securities:
Available for sale	0	0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| U.S. government agency securities
Investment securities:
Available for sale	47,275,000	23,041,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Investment securities:
Available for sale	119,162,000	119,767,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Residential mortgage-backed securities
Investment securities:
Available for sale	1,148,704,000	1,005,589,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Trust preferred securities
Investment securities:
Available for sale	4,386,000	6,074,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Corporate and other debt securities
Investment securities:
Available for sale	54,708,000	52,501,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Equity securities
Investment securities:
Available for sale	9,847,000	19,552,000
Significant Other Observable Inputs (Level 2) \| Non-recurring fair value measurements
Non-recurring fair value measurements:
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
Investment securities:
Available for sale	11,367,000	11,888,000
Loans held for sale	0	0
Other assets	0	0
Total assets	11,367,000	11,888,000
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| U.S. Treasury securities
Investment securities:
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| U.S. government agency securities
Investment securities:
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Investment securities:
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Residential mortgage-backed securities
Investment securities:
Available for sale	9,360,000	9,953,000
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Trust preferred securities
Investment securities:
Available for sale	2,007,000	1,935,000
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Corporate and other debt securities
Investment securities:
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Equity securities
Investment securities:
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Non-recurring fair value measurements
Non-recurring fair value measurements:
Collateral dependent impaired loans	3,470,000	5,385,000
Loan servicing rights	7,826,000	6,489,000
Foreclosed assets	2,710,000	4,532,000
Total	14,006,000	16,406,000
Fair Value \| Recurring fair value measurements
Investment securities:
Available for sale	1,454,331,000	1,297,373,000
Loans held for sale	11,184,000	57,708,000
Other assets	25,466,000	29,055,000
Total assets	1,490,981,000	1,384,136,000
Liabilities
Other liabilities	23,231,000	44,077,000
Total liabilities	23,231,000	44,077,000
Fair Value \| Recurring fair value measurements \| U.S. Treasury securities
Investment securities:
Available for sale	49,780,000	49,591,000
Fair Value \| Recurring fair value measurements \| U.S. government agency securities
Investment securities:
Available for sale	47,275,000	23,041,000
Fair Value \| Recurring fair value measurements \| Obligations of states and political subdivisions
Investment securities:
Available for sale	119,162,000	119,767,000
Fair Value \| Recurring fair value measurements \| Residential mortgage-backed securities
Investment securities:
Available for sale	1,158,064,000	1,015,542,000
Fair Value \| Recurring fair value measurements \| Trust preferred securities
Investment securities:
Available for sale	6,393,000	8,009,000
Fair Value \| Recurring fair value measurements \| Corporate and other debt securities
Investment securities:
Available for sale	62,717,000	60,565,000
Fair Value \| Recurring fair value measurements \| Equity securities
Investment securities:
Available for sale	10,940,000	20,858,000
Fair Value \| Non-recurring fair value measurements
Non-recurring fair value measurements:
Collateral dependent impaired loans	3,470,000	5,385,000
Loan servicing rights	7,826,000	6,489,000
Foreclosed assets	2,710,000	4,532,000
Total	$ 14,006,000	$ 16,406,000

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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 of asset after deduction of liability.

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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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