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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 341,962	$ 281,606	$ 302,527
Unrealized Gains	10,347	5,590	6,041
Unrealized Losses	(84)	(151)	(493)
Fair Value (Estimated)	352,225	287,045	308,075
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	31,144	32,840	35,995
Unrealized Gains	177	47	88
Unrealized Losses	0	(26)	0
Fair Value (Estimated)	31,321	32,861	36,083
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	50,983	14,431	16,569
Unrealized Gains	1,089	450	500
Unrealized Losses	(52)	(16)	(33)
Fair Value (Estimated)	52,020	14,865	17,036
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	245,085	219,585	236,213
Unrealized Gains	8,492	4,936	5,331
Unrealized Losses	(32)	(109)	(460)
Fair Value (Estimated)	253,545	224,412	241,084
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	14,750	14,750	13,750
Unrealized Gains	589	157	122
Unrealized Losses	0	0	0
Fair Value (Estimated)	$ 15,339	$ 14,907	$ 13,872

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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