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Securities - Amortized Cost and Estimated Fair Value of Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Securities held-to-maturity:
Amortized Cost	$ 297,443		$ 366,560
Gross Unrealized Gains	7,714		2,519
Gross Unrealized (Losses)	(230)		(972)
Allowance for credit losses	(54)	$ (58)
Estimated Fair Value	304,927		368,107
Agency mortgage-backed securities
Securities held-to-maturity:
Amortized Cost	228,652		285,344
Gross Unrealized Gains	6,075		1,206
Gross Unrealized (Losses)	(230)		(968)
Estimated Fair Value	234,497		285,582
Municipals - exempt from Federal tax
Securities held-to-maturity:
Amortized Cost	68,791		81,216
Gross Unrealized Gains	1,639		1,313
Gross Unrealized (Losses)			(4)
Allowance for credit losses	(54)
Estimated Fair Value	$ 70,430		$ 82,525

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