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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale [Abstract] |  |
Amortized cost | $ 1,150,224 | $ 978,774
Gross unrealized gains | 14,752 | 19,273
Gross unrealized losses | (9,781) | (786)
Fair value | 1,155,195 | 997,261
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 205,355 | 148,507
Gross unrealized gains | 419 | 483
Gross unrealized losses | (2,155) | (197)
Fair value | 203,619 | 148,793
State and Political Subdivisions [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 219,389 | 133,287
Gross unrealized gains | 5,416 | 7,132
Gross unrealized losses | (4,688) | (3)
Fair value | 220,117 | 140,416
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 669,134 | 640,537
Gross unrealized gains | 8,616 | 11,648
Gross unrealized losses | (2,918) | (378)
Fair value | 674,832 | 651,807
Other Debt Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 56,346 | 56,443
Gross unrealized gains | 301 | 10
Gross unrealized losses | (20) | (208)
Fair value | $ 56,627 | $ 56,245

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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