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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,318,416 $ 1,293,239
Gross Unrealized Gains 35,030 10,466
Gross Unrealized Losses 809 5,118
Fair Value 1,352,637 1,298,587
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,745 1,840
Gross Unrealized Gains 5 0
Gross Unrealized Losses 0 0
Fair Value 1,750 1,840
Obligations of U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 302,086 367,551
Gross Unrealized Gains 11,384 5,021
Gross Unrealized Losses 42 84
Fair Value 313,428 372,488
Obligations of U.S. states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 101,452 96,668
Gross Unrealized Gains 1,159 1,178
Gross Unrealized Losses 127 61
Fair Value 102,484 97,785
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 171,500 164,643
Gross Unrealized Gains 3,469 1,327
Gross Unrealized Losses 454 1,519
Fair Value 174,515 164,451
U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 739,133 660,037
Gross Unrealized Gains 19,013 2,940
Gross Unrealized Losses 119 3,387
Fair Value 758,027 659,590
U.S. corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,500 2,500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 67 67
Fair Value $ 2,433 $ 2,433