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Fair Value Measurements - General Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Financial assets and financial liabilities measured at fair value    
Transfers between levels of fair value hierarchy $ 0  
Securities available for sale 1,918,295 $ 697,685
Securities equity investments 6,378 6,169
Loans held for sale 20,291 25,895
U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 64,309 25,411
Obligations of U.S. government corporations and agencies    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 325,420 52,342
Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 283,478 170,044
Commercial mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 55,562 1,942
Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 1,049,761 315,748
Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 139,765 132,198
Recurring basis    
Financial assets and financial liabilities measured at fair value    
Securities equity investments 6,378 6,169
Loans held for sale 20,291 25,895
Recurring basis | Derivative assets    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other assets 5,986 2,062
Recurring basis | Derivative liabilities    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other liabilities 6,269 2,643
Recurring basis | U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 64,309 25,411
Recurring basis | Obligations of U.S. government corporations and agencies    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 325,420 52,342
Recurring basis | Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 283,478 170,044
Recurring basis | Commercial mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 55,562 1,942
Recurring basis | Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 1,049,761 315,748
Recurring basis | Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 139,765 132,198
Recurring basis | Level 1    
Financial assets and financial liabilities measured at fair value    
Securities equity investments 6,378 6,169
Recurring basis | Level 2    
Financial assets and financial liabilities measured at fair value    
Loans held for sale 20,291 25,895
Recurring basis | Level 2 | Derivative assets    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other assets 5,986 2,062
Recurring basis | Level 2 | Derivative liabilities    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other liabilities 6,269 2,643
Recurring basis | Level 2 | U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 64,309 25,411
Recurring basis | Level 2 | Obligations of U.S. government corporations and agencies    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 325,420 52,342
Recurring basis | Level 2 | Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 283,478 170,044
Recurring basis | Level 2 | Commercial mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 55,562 1,942
Recurring basis | Level 2 | Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 1,049,761 315,748
Recurring basis | Level 2 | Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale $ 139,765 $ 132,198