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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,293,239 $ 1,363,902
Gross Unrealized Gains 10,466 898
Gross Unrealized Losses 5,118 32,142
Fair Value 1,298,587 1,332,658
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,840 289
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 1,840 289
Obligations of U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 367,551 493,371
Gross Unrealized Gains 5,021 80
Gross Unrealized Losses 84 7,553
Fair Value 372,488 485,898
Obligations of U.S. states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 96,668 86,260
Gross Unrealized Gains 1,178 113
Gross Unrealized Losses 61 933
Fair Value 97,785 85,440
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 164,643 131,831
Gross Unrealized Gains 1,327 168
Gross Unrealized Losses 1,519 3,732
Fair Value 164,451 128,267
U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 660,037 649,620
Gross Unrealized Gains 2,940 537
Gross Unrealized Losses 3,387 19,599
Fair Value 659,590 630,558
Non-U.S. Government agencies or sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   31
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   31
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 67 325
Fair Value $ 2,433 $ 2,175