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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale: [Abstract]
Amortized Cost	$ 1,422,591	$ 855,163
Gross Unrealized Gains	17,166	25,075
Gross Unrealized (Losses)	(18,335)	(998)
Fair Value	1,421,422	879,240
Held-to-maturity: [Abstract]
Held-to-maturity	7,030	5,016
Gross Unrealized Gains	5
Unrealized (Losses)	0
Fair Value	7,035	5,119
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	208,598	127,067
Gross Unrealized Gains	80	790
Gross Unrealized (Losses)	(4,863)	(788)
Fair Value	203,815	127,069
Held-to-maturity: [Abstract]
Held-to-maturity	5,001	5,016
Gross Unrealized Gains	5	103
Unrealized (Losses)	0	0
Fair Value	5,006	5,119
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	383,991	237,886
Gross Unrealized Gains	12,123	11,995
Gross Unrealized (Losses)	(657)	(37)
Fair Value	395,457	249,844
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	799,456	479,470
Gross Unrealized Gains	4,292	12,038
Gross Unrealized (Losses)	(12,710)	(160)
Fair Value	791,038	491,348
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	30,546	10,740
Gross Unrealized Gains	671	252
Gross Unrealized (Losses)	(105)	(13)
Fair Value	31,112	$ 10,979
Held-to-maturity: [Abstract]
Held-to-maturity	2,029
Gross Unrealized Gains	0
Unrealized (Losses)	0
Fair Value	$ 2,029

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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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