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Fair Value Measurements - Recurring (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Assets:      
Securities available-for-sale $ 550,942 $ 550,942 $ 541,439
Mortgage servicing rights 7,541   6,944
U.S. Treasury      
Assets:      
Securities available-for-sale 3,895   3,947
U.S. government agencies      
Assets:      
Securities available-for-sale 12,730   13,061
U.S. government agency mortgage-backed      
Assets:      
Securities available-for-sale 13,844    
States and political subdivisions      
Assets and liabilities measured at fair value on a recurring basis      
Purchases 13,085 $ 9,561  
Assets:      
Securities available-for-sale 285,540   278,092
Corporate bonds      
Assets:      
Securities available-for-sale 703   833
Collateralized mortgage obligations      
Assets:      
Securities available-for-sale 63,744   65,939
Asset-backed securities      
Assets:      
Securities available-for-sale 110,870   112,932
Collateralized loan obligations      
Assets:      
Securities available-for-sale 59,616   54,421
Level 1      
Assets:      
Securities available-for-sale 3,895   3,947
Level 2      
Assets:      
Securities available-for-sale 518,424   520,963
Loans held-for-sale 2,426   4,067
Liabilities:      
Other liabilities 7   1,287
Level 3      
Assets:      
Securities available-for-sale 28,623   16,529
Recurring      
Assets:      
Securities available-for-sale     13,061
Total financial assets 563,155   553,415
Liabilities:      
Total 2,025   2,014
Recurring | Finite-Lived Intangible Assets [Member]      
Assets:      
Loans held-for-sale 2,426   4,067
Mortgage servicing rights 7,541   6,944
Recurring | Interest rate swap agreements net of swap credit valuation      
Liabilities:      
Other liabilities 2,025   2,014
Recurring | Interest rate swap agreements net of swap credit valuation | Finite-Lived Intangible Assets [Member]      
Assets:      
Other assets 2,017   727
Recurring | Forward MBS contracts and forward loan contracts | Finite-Lived Intangible Assets [Member]      
Assets:      
Other assets 229   238
Recurring | U.S. Treasury      
Assets:      
Securities available-for-sale     3,947
Recurring | U.S. Treasury | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 3,895    
Recurring | U.S. government agencies | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 12,730    
Recurring | U.S. government agency mortgage-backed | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 13,844   12,214
Recurring | States and political subdivisions | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 285,540   278,092
Recurring | Corporate bonds | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 703   833
Recurring | Collateralized mortgage obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 63,744   65,939
Recurring | Asset-backed securities | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 110,870   112,932
Recurring | Collateralized loan obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 59,616   54,421
Recurring | Level 1      
Assets:      
Total financial assets 3,895   3,947
Recurring | Level 1 | U.S. Treasury      
Assets:      
Securities available-for-sale     3,947
Recurring | Level 1 | U.S. Treasury | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 3,895    
Recurring | Level 2      
Assets:      
Securities available-for-sale     13,061
Total financial assets 523,096   525,995
Liabilities:      
Total 2,025   2,014
Recurring | Level 2 | Finite-Lived Intangible Assets [Member]      
Assets:      
Loans held-for-sale 2,426   4,067
Recurring | Level 2 | Interest rate swap agreements net of swap credit valuation      
Liabilities:      
Other liabilities 2,025   2,014
Recurring | Level 2 | Interest rate swap agreements net of swap credit valuation | Finite-Lived Intangible Assets [Member]      
Assets:      
Other assets 2,017   727
Recurring | Level 2 | Forward MBS contracts and forward loan contracts | Finite-Lived Intangible Assets [Member]      
Assets:      
Other assets 229   238
Recurring | Level 2 | U.S. government agencies | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 12,730    
Recurring | Level 2 | U.S. government agency mortgage-backed | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 13,844   12,214
Recurring | Level 2 | States and political subdivisions | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 259,013   263,831
Recurring | Level 2 | Corporate bonds | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 703   833
Recurring | Level 2 | Collateralized mortgage obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 61,648   63,671
Recurring | Level 2 | Asset-backed securities | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 110,870   112,932
Recurring | Level 2 | Collateralized loan obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 59,616   54,421
Recurring | Level 3      
Assets:      
Total financial assets 36,164   23,473
Recurring | Level 3 | Finite-Lived Intangible Assets [Member]      
Assets:      
Mortgage servicing rights 7,541   6,944
Recurring | Level 3 | States and political subdivisions | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale 26,527   14,261
Recurring | Level 3 | Collateralized mortgage obligations | Finite-Lived Intangible Assets [Member]      
Assets:      
Securities available-for-sale $ 2,096   $ 2,268