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Securities - Amortized Cost and Fair Value, Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | $ 1,301,973 | $ 1,276,871
Gross Unrealized Gains | 44,699 | 18,620
Gross Unrealized Losses | (3,215) | (4,878)
Fair Value | 1,343,457 | 1,290,613
U.S. Treasury securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 7,047 | 498
Gross Unrealized Gains | 32 | 1
Gross Unrealized Losses | 0 | 0
Fair Value | 7,079 | 499
Obligations of other U.S. Government agencies and corporations |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 1,003 | 2,518
Gross Unrealized Gains | 6 | 16
Gross Unrealized Losses | 0 | (3)
Fair Value | 1,009 | 2,531
Obligations of states and political subdivisions |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 291,231 | 218,362
Gross Unrealized Gains | 14,015 | 5,134
Gross Unrealized Losses | (45) | (365)
Fair Value | 305,201 | 223,131
Trust preferred securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 12,013 | 12,153
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,001) | (2,167)
Fair Value | 9,012 | 9,986
Other debt securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 62,771 | 55,364
Gross Unrealized Gains | 2,909 | 1,133
Gross Unrealized Losses | (73) | (132)
Fair Value | 65,607 | 56,365
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 581,105 | 708,970
Gross Unrealized Gains | 21,564 | 8,951
Gross Unrealized Losses | (23) | (1,816)
Fair Value | 602,646 | 716,105
Government agency mortgage backed securities | Commercial mortgage backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 29,053 | 30,372
Gross Unrealized Gains | 1,235 | 659
Gross Unrealized Losses | (1) | (24)
Fair Value | 30,287 | 31,007
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 218,373 | 172,178
Gross Unrealized Gains | 1,946 | 1,322
Gross Unrealized Losses | (51) | (262)
Fair Value | 220,268 | 173,238
Government agency collateralized mortgage obligations | Commercial mortgage backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 99,377 | 76,456
Gross Unrealized Gains | 2,992 | 1,404
Gross Unrealized Losses | (21) | (109)
Fair Value | $ 102,348 | $ 77,751

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