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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale: [Abstract] |  |
Amortized Cost | $ 684,051 | $ 673,945
Gross Unrealized Gains | 24,201 | 12,280
Gross Unrealized (Losses) | (94) | (589)
Fair Value | 708,158 | 685,636
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 15,009 | 69,542
Fair Value | 15,216 | 69,572
U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 73,000 | 106,428
Gross Unrealized Gains | 899 | 952
Gross Unrealized (Losses) | 0 | (60)
Fair Value | 73,899 | 107,320
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 15,009 | 69,542
Gross Unrealized Gains | 207 | 99
Unrealized (Losses) | 0 | (69)
Fair Value | 15,216 | 69,572
Obligations of States and Political Subdivisions |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 191,120 | 172,460
Gross Unrealized Gains | 9,593 | 5,990
Gross Unrealized (Losses) | (16) | (17)
Fair Value | 200,697 | 178,433
Mortgage-backed Securities: GSE Residential |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 412,175 | 391,307
Gross Unrealized Gains | 13,549 | 5,331
Gross Unrealized (Losses) | (50) | (512)
Fair Value | 425,674 | 396,126
Other Securities |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 7,756 | 3,750
Gross Unrealized Gains | 160 | 7
Gross Unrealized (Losses) | (28) | 0
Fair Value | $ 7,888 | $ 3,757

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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=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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