Fair Value Measurement of Assets and Liabilities - Recurring and Non-Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment securities
Available for sale	$ 1,723,106	$ 1,749,544
Non-recurring fair value measurements
Unpaid principal balances of loans held for sale	31,100	34,600
U.S. Treasury securities
Investment securities
Available for sale	49,854	49,306
U.S. government agency securities
Investment securities
Available for sale	34,553	36,277
Obligations of states and political subdivisions
Investment securities
Available for sale	193,950	197,092
Residential mortgage-backed securities
Investment securities
Available for sale	1,409,616	1,429,782
Corporate and other debt securities
Investment securities
Available for sale	35,133	37,087
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements
Investment securities
Available for sale	49,854	49,306
Loans held for sale	0	0
Other assets	0	0
Total assets	49,854	49,306
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	49,854	49,306
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 \| Corporate and other debt securities
Investment securities
Available for sale	0	0
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	1,673,252	1,700,238
Loans held for sale	31,903	35,155
Other assets	79,252	48,979
Total assets	1,784,407	1,784,372
Liabilities
Other liabilities	22,676	23,681
Total liabilities	22,676	23,681
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	34,553	36,277
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Investment securities
Available for sale	193,950	197,092
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Residential mortgage-backed securities
Investment securities
Available for sale	1,409,616	1,429,782
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Corporate and other debt securities
Investment securities
Available for sale	35,133	37,087
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	0	0
Loans held for sale	0	0
Other assets	0	0
Total assets	0	0
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	0	0
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) \| Non-recurring fair value measurements
Non-recurring fair value measurements
Collateral dependent impaired loans	46,025	45,245
Loan servicing rights	1,938	273
Foreclosed assets	6,431	5,673
Total	54,394	51,191
Fair Value \| Recurring fair value measurements
Investment securities
Available for sale	1,723,106	1,749,544
Loans held for sale	31,903	35,155
Other assets	79,252	48,979
Total assets	1,834,261	1,833,678
Liabilities
Other liabilities	22,676	23,681
Total liabilities	22,676	23,681
Fair Value \| Recurring fair value measurements \| U.S. Treasury securities
Investment securities
Available for sale	49,854	49,306
Fair Value \| Recurring fair value measurements \| U.S. government agency securities
Investment securities
Available for sale	34,553	36,277
Fair Value \| Recurring fair value measurements \| Obligations of states and political subdivisions
Investment securities
Available for sale	193,950	197,092
Fair Value \| Recurring fair value measurements \| Residential mortgage-backed securities
Investment securities
Available for sale	1,409,616	1,429,782
Fair Value \| Recurring fair value measurements \| Corporate and other debt securities
Investment securities
Available for sale	35,133	37,087
Fair Value \| Non-recurring fair value measurements
Non-recurring fair value measurements
Collateral dependent impaired loans	46,025	45,245
Loan servicing rights	1,938	273
Foreclosed assets	6,431	5,673
Total	$ 54,394	$ 51,191

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 security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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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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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