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Fair Value of Assets and Liabilities - Assets Measured at Fair Value Recurring (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Assets:    
Available-for-sale securities [1] $ 1,267,598 $ 1,275,493
U.S. Treasury and government agencies    
Assets:    
Available-for-sale securities 175,255 35,604
U.S. government sponsored agencies    
Assets:    
Available-for-sale securities 82,465 81,739
States and political subdivisions    
Assets:    
Available-for-sale securities 249,402 259,319
Residential mortgage-backed securities    
Assets:    
Available-for-sale securities 691,735 828,517
Commercial mortgage-backed securities    
Assets:    
Available-for-sale securities 58,301 63,519
Bank-issued trust preferred securities    
Assets:    
Available-for-sale securities 10,440 6,795
Recurring | Level 1    
Assets:    
Available-for-sale securities 175,255 35,604
Equity investment securities 135 160
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Level 2    
Assets:    
Available-for-sale securities 1,092,343 1,239,889
Equity investment securities 192 184
Derivative assets 20,145 12,163
Liabilities:    
Derivative liabilities 17,602 17,183
Recurring | Level 3    
Assets:    
Available-for-sale securities 0 0
Equity investment securities 0 0
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | U.S. Treasury and government agencies | Level 1    
Assets:    
Available-for-sale securities 175,255 35,604
Recurring | U.S. Treasury and government agencies | Level 2    
Assets:    
Available-for-sale securities 0 0
Recurring | U.S. Treasury and government agencies | Level 3    
Assets:    
Available-for-sale securities 0 0
Recurring | U.S. government sponsored agencies | Level 1    
Assets:    
Available-for-sale securities 0 0
Recurring | U.S. government sponsored agencies | Level 2    
Assets:    
Available-for-sale securities 82,465 81,739
Recurring | U.S. government sponsored agencies | Level 3    
Assets:    
Available-for-sale securities 0 0
Recurring | States and political subdivisions | Level 1    
Assets:    
Available-for-sale securities 0 0
Recurring | States and political subdivisions | Level 2    
Assets:    
Available-for-sale securities 249,402 259,319
Recurring | States and political subdivisions | Level 3    
Assets:    
Available-for-sale securities 0 0
Recurring | Residential mortgage-backed securities | Level 1    
Assets:    
Available-for-sale securities 0 0
Recurring | Residential mortgage-backed securities | Level 2    
Assets:    
Available-for-sale securities 691,735 828,517
Recurring | Residential mortgage-backed securities | Level 3    
Assets:    
Available-for-sale securities 0 0
Recurring | Commercial mortgage-backed securities | Level 1    
Assets:    
Available-for-sale securities 0 0
Recurring | Commercial mortgage-backed securities | Level 2    
Assets:    
Available-for-sale securities 58,301 63,519
Recurring | Commercial mortgage-backed securities | Level 3    
Assets:    
Available-for-sale securities 0 0
Recurring | Bank-issued trust preferred securities | Level 1    
Assets:    
Available-for-sale securities 0 0
Recurring | Bank-issued trust preferred securities | Level 2    
Assets:    
Available-for-sale securities 10,440 6,795
Recurring | Bank-issued trust preferred securities | Level 3    
Assets:    
Available-for-sale securities $ 0 $ 0
[1]     Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $286, respectively, at June 30, 2022 and $0 and $286, respectively, at December 31, 2021.