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Investment Securities - Amortized Cost and Estimated Fair Values of Investment Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Held to maturity securities:
Amortized Cost	$ 459,445		$ 481,280
Gross Unrealized Gains	23		19
Gross Unrealized Losses	44,769		56,565
Estimated Fair Value	414,699		424,734
Allowance for Credit Losses	199	$ 178	203	$ 108	$ 116	$ 94
U.S. Treasury and government agency securities
Held to maturity securities:
Amortized Cost	129,269		132,560
Gross Unrealized Gains	3		0
Gross Unrealized Losses	6,253		8,555
Estimated Fair Value	123,019		124,005
Allowance for Credit Losses	0		0
Mortgage-backed securities
Held to maturity securities:
Amortized Cost	321,213		336,755
Gross Unrealized Gains	5		0
Gross Unrealized Losses	37,884		47,234
Estimated Fair Value	283,334		289,521
Allowance for Credit Losses	0		0
Other debt securities
Held to maturity securities:
Amortized Cost	8,963		11,965
Gross Unrealized Gains	15		19
Gross Unrealized Losses	632		776
Estimated Fair Value	8,346		11,208
Allowance for Credit Losses	$ 199		$ 203

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Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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