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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale [Abstract] |  |
Amortized cost | $ 1,524,014 | $ 978,774
Gross unrealized gains | 13,594 | 19,273
Gross unrealized losses | (11,870) | (786)
Fair value | 1,525,738 | 997,261
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 303,897 | 148,507
Gross unrealized gains | 575 | 483
Gross unrealized losses | (2,062) | (197)
Fair value | 302,410 | 148,793
State and Political Subdivisions [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 335,389 | 133,287
Gross unrealized gains | 5,548 | 7,132
Gross unrealized losses | (5,381) | (3)
Fair value | 335,556 | 140,416
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 784,733 | 640,537
Gross unrealized gains | 7,070 | 11,648
Gross unrealized losses | (4,296) | (378)
Fair value | 787,507 | 651,807
Asset-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 99,995 | 56,443
Gross unrealized gains | 401 | 10
Gross unrealized losses | (131) | (208)
Fair value | $ 100,265 | $ 56,245

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