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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale: [Abstract]
Amortized Cost	$ 1,080,783	$ 855,163
Gross Unrealized Gains	18,290	25,075
Gross Unrealized (Losses)	(11,125)	(998)
Fair Value	1,087,948	879,240
Held-to-maturity: [Abstract]
Held-to-maturity	7,045	5,016
Gross Unrealized Gains	80
Unrealized (Losses)	0
Fair Value	7,125	5,119
U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies
Available-for-sale: [Abstract]
Amortized Cost	174,789	127,067
Gross Unrealized Gains	377	790
Gross Unrealized (Losses)	(3,636)	(788)
Fair Value	171,530	127,069
Held-to-maturity: [Abstract]
Held-to-maturity	5,012	5,016
Gross Unrealized Gains	80	103
Unrealized (Losses)	0	0
Fair Value	5,092	5,119
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	249,776	237,886
Gross Unrealized Gains	9,226	11,995
Gross Unrealized (Losses)	(1,283)	(37)
Fair Value	257,719	249,844
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	620,102	479,470
Gross Unrealized Gains	7,988	12,038
Gross Unrealized (Losses)	(6,138)	(160)
Fair Value	621,952	491,348
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	36,116	10,740
Gross Unrealized Gains	699	252
Gross Unrealized (Losses)	(68)	(13)
Fair Value	36,747	$ 10,979
Annuity
Held-to-maturity: [Abstract]
Held-to-maturity	2,033
Gross Unrealized Gains	0
Unrealized (Losses)	0
Fair Value	$ 2,033

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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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