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Fair Value Measurements - General Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Financial assets and financial liabilities measured at fair value    
Transfers between levels of fair value hierarchy $ 0  
Securities available for sale 646,349 $ 759,811
Loans held for sale 168,415 256,319
U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 85,848 74,944
Obligations of U.S. government corporations and agencies    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 66,775 79,127
Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 143,353 154,938
Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 313,351 302,249
Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 31,994 143,343
Mutual funds and other equity securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 5,028 5,210
Recurring basis    
Financial assets and financial liabilities measured at fair value    
Loans held for sale 168,415 256,319
Recurring basis | Foreign currency forward contracts    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other liabilities   7
Recurring basis | Derivative financial assets    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other assets 2,375 6,403
Recurring basis | Derivative financial liabilities    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other liabilities 4,529 3,098
Recurring basis | U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 85,848 74,944
Recurring basis | Obligations of U.S. government corporations and agencies    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 66,775 79,127
Recurring basis | Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 143,353 154,938
Recurring basis | Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 313,351 302,249
Recurring basis | Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 31,994 143,343
Recurring basis | Mutual funds and other equity securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 5,028 5,210
Recurring basis | Level 1 | Mutual funds and other equity securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 5,028 5,210
Recurring basis | Level 2    
Financial assets and financial liabilities measured at fair value    
Loans held for sale 168,415 256,319
Recurring basis | Level 2 | Foreign currency forward contracts    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other liabilities   7
Recurring basis | Level 2 | Derivative financial assets    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other assets 2,375 6,403
Recurring basis | Level 2 | Derivative financial liabilities    
Financial assets and financial liabilities measured at fair value    
Fair value recorded in other liabilities 4,529 3,098
Recurring basis | Level 2 | U.S. Treasury securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 85,848 74,944
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 66,775 79,127
Recurring basis | Level 2 | Obligations of states and political subdivisions    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 143,353 154,938
Recurring basis | Level 2 | Residential mortgage-backed securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale 313,351 302,249
Recurring basis | Level 2 | Corporate debt securities    
Financial assets and financial liabilities measured at fair value    
Securities available for sale $ 31,994 $ 143,343