Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale securities:
Amortized Cost	$ 93,052		$ 95,999
Gross Unrealized Gains	30		7
Gross Unrealized Losses	13,939		12,419
Investment securities - AFS	79,143		83,587
Held-to-maturity securities:
Amortized Cost	523,177		559,455
Gross Unrealized Gains	2		35
Gross Unrealized Losses	77,527		64,863
Estimated Fair Value	445,652		494,627
Allowance for Credit Losses	126	$ 163	0
U.S. Government agencies
Available-for-sale securities:
Amortized Cost	23,622		21,798
Gross Unrealized Gains	4		5
Gross Unrealized Losses	3,995		3,625
Investment securities - AFS	19,631		18,178
Held-to-maturity securities:
Amortized Cost	143,494		148,097
Gross Unrealized Gains	0		0
Gross Unrealized Losses	14,873		13,601
Estimated Fair Value	128,621		134,496
Allowance for Credit Losses	0		0
Mortgage-backed-residential
Available-for-sale securities:
Amortized Cost	63,371		72,183
Gross Unrealized Gains	0		2
Gross Unrealized Losses	9,798		8,666
Investment securities - AFS	53,573		63,519
Held-to-maturity securities:
Amortized Cost	367,712		398,884
Gross Unrealized Gains	0		0
Gross Unrealized Losses	61,177		50,464
Estimated Fair Value	306,535		348,420
Allowance for Credit Losses	0		0
Other debt securities
Available-for-sale securities:
Amortized Cost	6,059		2,018
Gross Unrealized Gains	26		0
Gross Unrealized Losses	146		128
Investment securities - AFS	5,939		1,890
Held-to-maturity securities:
Amortized Cost	10,500		11,000
Gross Unrealized Gains	0		0
Gross Unrealized Losses	1,409		770
Estimated Fair Value	9,091		10,230
Allowance for Credit Losses	126		0
States and political subdivisions
Held-to-maturity securities:
Amortized Cost	1,471		1,474
Gross Unrealized Gains	2		35
Gross Unrealized Losses	68		28
Estimated Fair Value	1,405		1,481
Allowance for Credit Losses	$ 0		$ 0

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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