Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Available for sale securities:
Amortized Cost	$ 187,862		$ 159,593
Gross Unrealized Gains	538		557
Gross Unrealized Losses	9,252		10,938
Available for sale securities	179,148		149,212
Held to maturity securities:
Amortized Cost	469,750		481,280
Gross Unrealized Gains	17		19
Gross Unrealized Losses	48,339		56,565
Estimated Fair Value	421,428		424,734
Allowance for Credit Losses	178	$ 116	203	$ 94
Available for sale securities sold	0	$ 0
U.S. Treasury and government agency securities
Available for sale securities:
Amortized Cost	22,673		22,984
Gross Unrealized Gains	3		4
Gross Unrealized Losses	2,332		2,786
Available for sale securities	20,344		20,202
Held to maturity securities:
Amortized Cost	129,327		132,560
Gross Unrealized Gains	0		0
Gross Unrealized Losses	7,001		8,555
Estimated Fair Value	122,326		124,005
Allowance for Credit Losses	0		0
Mortgage-backed securities
Available for sale securities:
Amortized Cost	158,997		130,439
Gross Unrealized Gains	32		84
Gross Unrealized Losses	6,920		8,139
Available for sale securities	152,109		122,384
Held to maturity securities:
Amortized Cost	328,459		336,755
Gross Unrealized Gains	2		0
Gross Unrealized Losses	40,631		47,234
Estimated Fair Value	287,830		289,521
Allowance for Credit Losses	0		0
Other debt securities
Available for sale securities:
Amortized Cost	6,192		6,170
Gross Unrealized Gains	503		469
Gross Unrealized Losses	0		13
Available for sale securities	6,695		6,626
Held to maturity securities:
Amortized Cost	11,964		11,965
Gross Unrealized Gains	15		19
Gross Unrealized Losses	707		776
Estimated Fair Value	11,272		11,208
Allowance for Credit Losses	$ 178		$ 203

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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