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Fair Value Measurements - Recurring (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Assets and liabilities measured at fair value on a recurring basis      
Transfers of securities between levels $ 0 $ 0  
Assets:      
Securities available-for-sale 611,054,000   $ 531,838,000
Mortgage servicing rights 6,608,000   6,489,000
U.S. government agencies      
Assets:      
Securities available-for-sale     41,534,000
U.S. government agency mortgage-backed      
Assets:      
Securities available-for-sale 38,558,000    
States and political subdivisions      
Assets and liabilities measured at fair value on a recurring basis      
Purchases 9,561,000    
Assets:      
Securities available-for-sale 219,507,000   68,703,000
Corporate bonds      
Assets:      
Securities available-for-sale 12,540,000   10,630,000
Collateralized mortgage obligations      
Assets:      
Securities available-for-sale 108,324,000   170,927,000
Asset-backed securities      
Assets:      
Securities available-for-sale 139,886,000   138,407,000
Collateralized loan obligations      
Assets:      
Securities available-for-sale 92,239,000   101,637,000
Level 2      
Assets:      
Securities available-for-sale 576,545,000   506,493,000
Loans held-for-sale 3,933,000   4,918,000
Liabilities:      
Other liabilities 845,000   994,000
Level 3      
Assets and liabilities measured at fair value on a recurring basis      
Purchases   $ 0  
Assets:      
Securities available-for-sale 34,509,000   25,345,000
Recurring      
Assets:      
Total financial assets 622,557,000   544,205,000
Liabilities:      
Total 1,520,000   1,667,000
Recurring | Finite-Lived Intangible Assets [Member]      
Assets:      
Loans held-for-sale 3,933,000   4,918,000
Mortgage servicing rights 6,608,000   6,489,000
Recurring | Interest rate swap agreements net of swap credit valuation      
Liabilities:      
Other liabilities 1,520,000   1,667,000
Recurring | Interest rate swap agreements net of swap credit valuation | Finite-Lived Intangible Assets [Member]      
Assets:      
Other assets 675,000   673,000
Recurring | Forward MBS contracts and forward loan contracts | Finite-Lived Intangible Assets [Member]      
Assets:      
Other assets 287,000   287,000
Recurring | U.S. government agency mortgage-backed | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 38,558,000   41,534,000
Recurring | States and political subdivisions | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 219,507,000   68,703,000
Recurring | Corporate bonds | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 12,540,000   10,630,000
Recurring | Collateralized mortgage obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 108,324,000   170,927,000
Recurring | Asset-backed securities | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 139,886,000   138,407,000
Recurring | Collateralized loan obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 92,239,000   101,637,000
Recurring | Level 2      
Assets:      
Total financial assets 581,440,000   512,371,000
Liabilities:      
Total 1,520,000   1,667,000
Recurring | Level 2 | Finite-Lived Intangible Assets [Member]      
Assets:      
Loans held-for-sale 3,933,000   4,918,000
Recurring | Level 2 | Interest rate swap agreements net of swap credit valuation      
Liabilities:      
Other liabilities 1,520,000   1,667,000
Recurring | Level 2 | Interest rate swap agreements net of swap credit valuation | Finite-Lived Intangible Assets [Member]      
Assets:      
Other assets 675,000   673,000
Recurring | Level 2 | Forward MBS contracts and forward loan contracts | Finite-Lived Intangible Assets [Member]      
Assets:      
Other assets 287,000   287,000
Recurring | Level 2 | U.S. government agency mortgage-backed | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 38,558,000   41,534,000
Recurring | Level 2 | States and political subdivisions | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 187,842,000   46,477,000
Recurring | Level 2 | Corporate bonds | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 12,540,000   10,630,000
Recurring | Level 2 | Collateralized mortgage obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 105,480,000   167,808,000
Recurring | Level 2 | Asset-backed securities | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 139,886,000   138,407,000
Recurring | Level 2 | Collateralized loan obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 92,239,000   101,637,000
Recurring | Level 3      
Assets:      
Total financial assets 41,117,000   31,834,000
Recurring | Level 3 | Finite-Lived Intangible Assets [Member]      
Assets:      
Mortgage servicing rights 6,608,000   6,489,000
Recurring | Level 3 | States and political subdivisions | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 31,665,000   22,226,000
Recurring | Level 3 | Collateralized mortgage obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale $ 2,844,000   $ 3,119,000