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Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Investment securities, available-for-sale $ 904,033 $ 850,467
Mortgages held for sale 13,123 15,849
U.S. Treasury and Federal agencies securities    
Assets:    
Investment securities, available-for-sale 468,119 420,833
U.S. States and political subdivisions securities    
Assets:    
Investment securities, available-for-sale 116,000 132,975
Mortgage-backed securities - Federal agencies    
Assets:    
Investment securities, available-for-sale 287,910 252,574
Corporate debt securities    
Assets:    
Investment securities, available-for-sale 31,294 35,076
Foreign government and other securities    
Assets:    
Investment securities, available-for-sale 710 807
Total debt securities    
Assets:    
Investment securities, available-for-sale   842,265
Marketable equity securities    
Assets:    
Investment securities, available-for-sale   8,202
Total    
Assets:    
Investment securities, available-for-sale 904,033 850,467
Mortgages held for sale 13,123 15,849
Level 1    
Assets:    
Investment securities, available-for-sale 27,971 28,366
Mortgages held for sale 0 0
Level 2    
Assets:    
Investment securities, available-for-sale 873,197 818,595
Mortgages held for sale 13,123 15,849
Level 3    
Assets:    
Investment securities, available-for-sale 2,865 3,506
Mortgages held for sale 0 0
Recurring | Total    
Assets:    
Investment securities, available-for-sale 904,033 850,467
Mortgages held for sale 13,123 15,849
Total 922,323 872,937
Liabilities:    
Total 5,262 6,743
Recurring | Total | Interest rate swap contracts    
Assets:    
Accrued income and other assets 5,167 6,621
Liabilities:    
Accrued expenses and other liabilities 5,262 6,743
Recurring | Total | U.S. Treasury and Federal agencies securities    
Assets:    
Investment securities, available-for-sale 468,119 420,833
Recurring | Total | U.S. States and political subdivisions securities    
Assets:    
Investment securities, available-for-sale 116,000 132,975
Recurring | Total | Mortgage-backed securities - Federal agencies    
Assets:    
Investment securities, available-for-sale 287,910 252,574
Recurring | Total | Corporate debt securities    
Assets:    
Investment securities, available-for-sale 31,294 35,076
Recurring | Total | Foreign government and other securities    
Assets:    
Investment securities, available-for-sale 710 807
Recurring | Total | Total debt securities    
Assets:    
Investment securities, available-for-sale   842,265
Recurring | Total | Marketable equity securities    
Assets:    
Investment securities, available-for-sale   8,202
Recurring | Level 1    
Assets:    
Investment securities, available-for-sale 27,971 28,366
Mortgages held for sale 0 0
Total 27,971 28,366
Liabilities:    
Total 0 0
Recurring | Level 1 | Interest rate swap contracts    
Assets:    
Accrued income and other assets 0 0
Liabilities:    
Accrued expenses and other liabilities 0 0
Recurring | Level 1 | U.S. Treasury and Federal agencies securities    
Assets:    
Investment securities, available-for-sale 27,971 20,164
Recurring | Level 1 | U.S. States and political subdivisions securities    
Assets:    
Investment securities, available-for-sale 0 0
Recurring | Level 1 | Mortgage-backed securities - Federal agencies    
Assets:    
Investment securities, available-for-sale 0 0
Recurring | Level 1 | Corporate debt securities    
Assets:    
Investment securities, available-for-sale 0 0
Recurring | Level 1 | Foreign government and other securities    
Assets:    
Investment securities, available-for-sale 0 0
Recurring | Level 1 | Total debt securities    
Assets:    
Investment securities, available-for-sale   20,164
Recurring | Level 1 | Marketable equity securities    
Assets:    
Investment securities, available-for-sale   8,202
Recurring | Level 2    
Assets:    
Investment securities, available-for-sale 873,197 818,595
Mortgages held for sale 13,123 15,849
Total 891,487 841,065
Liabilities:    
Total 5,262 6,743
Recurring | Level 2 | Interest rate swap contracts    
Assets:    
Accrued income and other assets 5,167 6,621
Liabilities:    
Accrued expenses and other liabilities 5,262 6,743
Recurring | Level 2 | U.S. Treasury and Federal agencies securities    
Assets:    
Investment securities, available-for-sale 440,148 400,669
Recurring | Level 2 | U.S. States and political subdivisions securities    
Assets:    
Investment securities, available-for-sale 113,845 130,276
Recurring | Level 2 | Mortgage-backed securities - Federal agencies    
Assets:    
Investment securities, available-for-sale 287,910 252,574
Recurring | Level 2 | Corporate debt securities    
Assets:    
Investment securities, available-for-sale 31,294 35,076
Recurring | Level 2 | Foreign government and other securities    
Assets:    
Investment securities, available-for-sale 0 0
Recurring | Level 2 | Total debt securities    
Assets:    
Investment securities, available-for-sale   818,595
Recurring | Level 2 | Marketable equity securities    
Assets:    
Investment securities, available-for-sale   0
Recurring | Level 3    
Assets:    
Investment securities, available-for-sale 2,865 3,506
Mortgages held for sale 0 0
Total 2,865 3,506
Liabilities:    
Total 0 0
Recurring | Level 3 | Interest rate swap contracts    
Assets:    
Accrued income and other assets 0 0
Liabilities:    
Accrued expenses and other liabilities 0 0
Recurring | Level 3 | U.S. Treasury and Federal agencies securities    
Assets:    
Investment securities, available-for-sale 0 0
Recurring | Level 3 | U.S. States and political subdivisions securities    
Assets:    
Investment securities, available-for-sale 2,155 2,699
Recurring | Level 3 | Mortgage-backed securities - Federal agencies    
Assets:    
Investment securities, available-for-sale 0 0
Recurring | Level 3 | Corporate debt securities    
Assets:    
Investment securities, available-for-sale 0 0
Recurring | Level 3 | Foreign government and other securities    
Assets:    
Investment securities, available-for-sale $ 710 807
Recurring | Level 3 | Total debt securities    
Assets:    
Investment securities, available-for-sale   3,506
Recurring | Level 3 | Marketable equity securities    
Assets:    
Investment securities, available-for-sale   $ 0