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Fair Value Measurements - General Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Financial assets and financial liabilities measured at fair value    
Transfers between levels of fair value hierarchy $ 0  
Securities available for sale 863,381 $ 872,682
Securities equity investments 7,317 5,378
Loans held for sale 32,617 94,848
U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 59,854 60,348
Obligations of U.S. government corporations and agencies    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 89,666 103,665
Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 241,925 280,199
Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 331,582 397,436
Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 140,354 31,034
Recurring basis    
Financial assets and financial liabilities measured at fair value    
Securities equity investments 7,317 5,378
Loans held for sale 32,617 94,848
Recurring basis | Derivative assets    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other assets 2,750 937
Recurring basis | Derivative liabilities    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other liabilities 2,989 2,410
Recurring basis | U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 59,854 60,348
Recurring basis | Obligations of U.S. government corporations and agencies    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 89,666 103,665
Recurring basis | Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 241,925 280,199
Recurring basis | Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 331,582 397,436
Recurring basis | Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 140,354 31,034
Recurring basis | Level 1    
Financial assets and financial liabilities measured at fair value    
Securities equity investments 7,317 5,378
Recurring basis | Level 2    
Financial assets and financial liabilities measured at fair value    
Loans held for sale 32,617 94,848
Recurring basis | Level 2 | Derivative assets    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other assets 2,750 937
Recurring basis | Level 2 | Derivative liabilities    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other liabilities 2,989 2,410
Recurring basis | Level 2 | U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 59,854 60,348
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 89,666 103,665
Recurring basis | Level 2 | Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 241,925 280,199
Recurring basis | Level 2 | Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 331,582 397,436
Recurring basis | Level 2 | Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale $ 140,354 $ 31,034