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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale: [Abstract]
Amortized Cost	$ 1,339,032	$ 855,163
Gross Unrealized Gains	18,801	25,075
Gross Unrealized (Losses)	(10,867)	(998)
Fair Value	1,346,966	879,240
Held-to-maturity: [Abstract]
Held-to-maturity	7,026	5,016
Gross Unrealized Gains	31
Unrealized (Losses)	0
Fair Value	7,057	5,119
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	194,162	127,067
Gross Unrealized Gains	308	790
Gross Unrealized (Losses)	(2,786)	(788)
Fair Value	191,684	127,069
Held-to-maturity: [Abstract]
Held-to-maturity	5,004	5,016
Gross Unrealized Gains	31	103
Unrealized (Losses)	0	0
Fair Value	5,035	5,119
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	328,394	237,886
Gross Unrealized Gains	11,310	11,995
Gross Unrealized (Losses)	(960)	(37)
Fair Value	338,744	249,844
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	783,400	479,470
Gross Unrealized Gains	6,300	12,038
Gross Unrealized (Losses)	(7,085)	(160)
Fair Value	782,615	491,348
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	33,076	10,740
Gross Unrealized Gains	883	252
Gross Unrealized (Losses)	(36)	(13)
Fair Value	33,923	$ 10,979
Held-to-maturity: [Abstract]
Held-to-maturity	2,022
Gross Unrealized Gains	0
Unrealized (Losses)	0
Fair Value	$ 2,022

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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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