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Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair value measurements    
Investment securities available-for-sale $ 1,040,583 $ 990,129
Assets:    
Mortgages held for sale 20,277 11,290
U.S. Treasury and Federal agencies securities    
Fair value measurements    
Investment securities available-for-sale 526,964 531,223
U.S. States and political subdivisions securities    
Fair value measurements    
Investment securities available-for-sale 84,505 94,582
Mortgage-backed securities - Federal agencies    
Fair value measurements    
Investment securities available-for-sale 375,389 318,233
Corporate debt securities    
Fair value measurements    
Investment securities available-for-sale 53,025 45,392
Foreign government and other securities    
Fair value measurements    
Investment securities available-for-sale 700 699
Total    
Fair value measurements    
Investment securities available-for-sale 1,040,583 990,129
Assets:    
Mortgages held for sale 20,277 11,290
Level 1    
Fair value measurements    
Investment securities available-for-sale 80,393 33,746
Assets:    
Mortgages held for sale 0 0
Level 2    
Fair value measurements    
Investment securities available-for-sale 957,898 955,358
Assets:    
Mortgages held for sale 20,277 11,290
Level 3    
Fair value measurements    
Investment securities available-for-sale 2,292 1,025
Assets:    
Mortgages held for sale 0 0
Recurring | Total    
Fair value measurements    
Investment securities available-for-sale 1,040,583 990,129
Assets:    
Mortgages held for sale 20,277 11,290
Total 1,082,835 1,008,543
Liabilities:    
Total 22,352 7,250
Recurring | Total | Interest rate swap contracts    
Assets:    
Accrued income and other assets 21,975 7,124
Liabilities:    
Accrued expenses and other liabilities 22,352 7,250
Recurring | Total | U.S. Treasury and Federal agencies securities    
Fair value measurements    
Investment securities available-for-sale 526,964 531,223
Recurring | Total | U.S. States and political subdivisions securities    
Fair value measurements    
Investment securities available-for-sale 84,505 94,582
Recurring | Total | Mortgage-backed securities - Federal agencies    
Fair value measurements    
Investment securities available-for-sale 375,389 318,233
Recurring | Total | Corporate debt securities    
Fair value measurements    
Investment securities available-for-sale 53,025 45,392
Recurring | Total | Foreign government and other securities    
Fair value measurements    
Investment securities available-for-sale 700 699
Recurring | Level 1    
Fair value measurements    
Investment securities available-for-sale 80,393 33,746
Assets:    
Mortgages held for sale 0 0
Total 80,393 33,746
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    
Fair value measurements    
Investment securities available-for-sale 80,393 33,746
Recurring | Level 1 | U.S. States and political subdivisions securities    
Fair value measurements    
Investment securities available-for-sale 0 0
Recurring | Level 1 | Mortgage-backed securities - Federal agencies    
Fair value measurements    
Investment securities available-for-sale 0 0
Recurring | Level 1 | Corporate debt securities    
Fair value measurements    
Investment securities available-for-sale 0 0
Recurring | Level 1 | Foreign government and other securities    
Fair value measurements    
Investment securities available-for-sale 0 0
Recurring | Level 2    
Fair value measurements    
Investment securities available-for-sale 957,898 955,358
Assets:    
Mortgages held for sale 20,277 11,290
Total 1,000,150 973,772
Liabilities:    
Total 22,352 7,250
Recurring | Level 2 | Interest rate swap contracts    
Assets:    
Accrued income and other assets 21,975 7,124
Liabilities:    
Accrued expenses and other liabilities 22,352 7,250
Recurring | Level 2 | U.S. Treasury and Federal agencies securities    
Fair value measurements    
Investment securities available-for-sale 446,571 497,477
Recurring | Level 2 | U.S. States and political subdivisions securities    
Fair value measurements    
Investment securities available-for-sale 82,213 93,557
Recurring | Level 2 | Mortgage-backed securities - Federal agencies    
Fair value measurements    
Investment securities available-for-sale 375,389 318,233
Recurring | Level 2 | Corporate debt securities    
Fair value measurements    
Investment securities available-for-sale 53,025 45,392
Recurring | Level 2 | Foreign government and other securities    
Fair value measurements    
Investment securities available-for-sale 700 699
Recurring | Level 3    
Fair value measurements    
Investment securities available-for-sale 2,292 1,025
Assets:    
Mortgages held for sale 0 0
Total 2,292 1,025
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    
Fair value measurements    
Investment securities available-for-sale 0 0
Recurring | Level 3 | U.S. States and political subdivisions securities    
Fair value measurements    
Investment securities available-for-sale 2,292 1,025
Recurring | Level 3 | Mortgage-backed securities - Federal agencies    
Fair value measurements    
Investment securities available-for-sale 0 0
Recurring | Level 3 | Corporate debt securities    
Fair value measurements    
Investment securities available-for-sale 0 0
Recurring | Level 3 | Foreign government and other securities    
Fair value measurements    
Investment securities available-for-sale $ 0 $ 0