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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale debt securities $ 1,637,255 $ 1,293,239
Gross Unrealized Gains 32,487 10,466
Gross Unrealized Losses 2,976 5,118
Fair Value 1,666,766 1,298,587
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale debt securities   1,840
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   1,840
Obligations of U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale debt securities 602,417 367,551
Gross Unrealized Gains 10,881 5,021
Gross Unrealized Losses 817 84
Fair Value 612,481 372,488
Obligations of U.S. states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale debt securities 126,593 96,668
Gross Unrealized Gains 2,840 1,178
Gross Unrealized Losses 175 61
Fair Value 129,258 97,785
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale debt securities 205,507 164,643
Gross Unrealized Gains 2,981 1,327
Gross Unrealized Losses 987 1,519
Fair Value 207,501 164,451
U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale debt securities 700,238 660,037
Gross Unrealized Gains 15,785 2,940
Gross Unrealized Losses 863 3,387
Fair Value 715,160 659,590
U.S. corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale debt securities 2,500 2,500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 134 67
Fair Value $ 2,366 $ 2,433