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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).

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