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Securities (Schedule of Securities Available-for-Sale) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,681,122,000 | $ 1,172,175,000
Gross Unrealized Gains | 32,698,000 | 46,003,000
Gross Unrealized Losses | (17,595,000) | (326,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 1,696,225,000 | 1,217,852,000
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 813,088,000 | 548,273,000
Gross Unrealized Gains | 26,425,000 | 33,077,000
Gross Unrealized Losses | (6,060,000) | (103,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 833,453,000 | 581,247,000
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 728,789,000 | 535,526,000
Gross Unrealized Gains | 6,250,000 | 12,806,000
Gross Unrealized Losses | (8,407,000) | (25,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 726,632,000 | 548,307,000
US Gov't Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 139,245,000 | 88,376,000
Gross Unrealized Gains | 23,000 | 120,000
Gross Unrealized Losses | (3,128,000) | (198,000)
Allowance for Credit Losses | 0 | 0
Fair Value | $ 136,140,000 | $ 88,298,000

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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=123581744&loc=d3e27161-111563 + Details
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