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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale [Abstract] |  |
Amortized cost | $ 1,346,551 | $ 978,774
Gross unrealized gains | 16,253 | 19,273
Gross unrealized losses | (5,207) | (786)
Fair value | 1,357,597 | 997,261
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 245,706 | 148,507
Gross unrealized gains | 920 | 483
Gross unrealized losses | (931) | (197)
Fair value | 245,695 | 148,793
State and Political Subdivisions [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 257,011 | 133,287
Gross unrealized gains | 6,733 | 7,132
Gross unrealized losses | (2,167) | (3)
Fair value | 261,577 | 140,416
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 751,580 | 640,537
Gross unrealized gains | 8,198 | 11,648
Gross unrealized losses | (2,028) | (378)
Fair value | 757,750 | 651,807
Other Debt Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 92,254 | 56,443
Gross unrealized gains | 402 | 10
Gross unrealized losses | (81) | (208)
Fair value | $ 92,575 | $ 56,245

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