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Fair Value of Financial Instruments - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets:
Investment securities available-for-sale	$ 1,739,423	$ 895,034
Derivatives	107,516	103,603
Liabilities:
Derivatives	121,992	105,255
Recurring basis
Assets:
Investment securities available-for-sale	1,739,423	895,034
Loans held for investment	286
Recurring basis | Level 1
Assets:
Investment securities available-for-sale	0	0
Loans held for investment
Recurring basis | Level 2
Assets:
Investment securities available-for-sale	1,717,520	875,544
Loans held for investment
Recurring basis | Level 3
Assets:
Investment securities available-for-sale	21,903	19,490
Loans held for investment	286
GSE debentures
Assets:
Investment securities available-for-sale	328,351	176,294
GSE debentures | Recurring basis
Assets:
Investment securities available-for-sale	328,351	176,294
GSE debentures | Recurring basis | Level 1
Assets:
Investment securities available-for-sale	0	0
GSE debentures | Recurring basis | Level 2
Assets:
Investment securities available-for-sale	328,351	176,294
GSE debentures | Recurring basis | Level 3
Assets:
Investment securities available-for-sale	0	0
GSE CMOs
Assets:
Investment securities available-for-sale	339,701	55,543
GSE CMOs | Recurring basis
Assets:
Investment securities available-for-sale	339,701	55,543
GSE CMOs | Recurring basis | Level 1
Assets:
Investment securities available-for-sale	0	0
GSE CMOs | Recurring basis | Level 2
Assets:
Investment securities available-for-sale	339,701	55,543
GSE CMOs | Recurring basis | Level 3
Assets:
Investment securities available-for-sale	0	0
GSE MBSs
Assets:
Investment securities available-for-sale	332,394	148,285
GSE MBSs | Recurring basis
Assets:
Investment securities available-for-sale	332,394	148,285
GSE MBSs | Recurring basis | Level 1
Assets:
Investment securities available-for-sale	0	0
GSE MBSs | Recurring basis | Level 2
Assets:
Investment securities available-for-sale	332,394	148,285
GSE MBSs | Recurring basis | Level 3
Assets:
Investment securities available-for-sale	0	0
Municipal obligations
Assets:
Investment securities available-for-sale	235,434	20,254
Municipal obligations | Recurring basis
Assets:
Investment securities available-for-sale	235,434	20,254
Municipal obligations | Recurring basis | Level 1
Assets:
Investment securities available-for-sale	0	0
Municipal obligations | Recurring basis | Level 2
Assets:
Investment securities available-for-sale	224,548	3,198
Municipal obligations | Recurring basis | Level 3
Assets:
Investment securities available-for-sale	10,886	17,056
Corporate debt obligations
Assets:
Investment securities available-for-sale	48,255	12,287
Corporate debt obligations | Recurring basis
Assets:
Investment securities available-for-sale	48,255	12,287
Corporate debt obligations | Recurring basis | Level 1
Assets:
Investment securities available-for-sale	0	0
Corporate debt obligations | Recurring basis | Level 2
Assets:
Investment securities available-for-sale	37,238	9,853
Corporate debt obligations | Recurring basis | Level 3
Assets:
Investment securities available-for-sale	11,017	2,434
U.S. Treasury bonds
Assets:
Investment securities available-for-sale	454,800	481,900
U.S. Treasury bonds | Recurring basis
Assets:
Investment securities available-for-sale	454,788	481,872
U.S. Treasury bonds | Recurring basis | Level 1
Assets:
Investment securities available-for-sale	0	0
U.S. Treasury bonds | Recurring basis | Level 2
Assets:
Investment securities available-for-sale	454,788	481,872
U.S. Treasury bonds | Recurring basis | Level 3
Assets:
Investment securities available-for-sale	0	0
Foreign government obligations
Assets:
Investment securities available-for-sale	500	499
Foreign government obligations | Recurring basis
Assets:
Investment securities available-for-sale	500	499
Foreign government obligations | Recurring basis | Level 1
Assets:
Investment securities available-for-sale	0	0
Foreign government obligations | Recurring basis | Level 2
Assets:
Investment securities available-for-sale	500	499
Foreign government obligations | Recurring basis | Level 3
Assets:
Investment securities available-for-sale	0	0
Interest rate derivatives | Recurring basis
Assets:
Derivatives	164	18
Liabilities:
Derivatives	512	2,051
Interest rate derivatives | Recurring basis | Level 1
Assets:
Derivatives	0	0
Liabilities:
Derivatives	0	0
Interest rate derivatives | Recurring basis | Level 2
Assets:
Derivatives	164	18
Liabilities:
Derivatives	512	2,051
Interest rate derivatives | Recurring basis | Level 3
Assets:
Derivatives	0	0
Liabilities:
Derivatives	0	0
Loan level derivatives | Recurring basis
Assets:
Derivatives	106,222	102,608
Liabilities:
Derivatives	120,893	102,608
Loan level derivatives | Recurring basis | Level 1
Assets:
Derivatives	0	0
Liabilities:
Derivatives	0	0
Loan level derivatives | Recurring basis | Level 2
Assets:
Derivatives	106,222	102,608
Liabilities:
Derivatives	120,893	102,608
Loan level derivatives | Recurring basis | Level 3
Assets:
Derivatives	0	0
Liabilities:
Derivatives	0	0
Risk participation-out agreements | Recurring basis
Assets:
Derivatives	723	495
Risk participation-out agreements | Recurring basis | Level 1
Assets:
Derivatives	0	0
Risk participation-out agreements | Recurring basis | Level 2
Assets:
Derivatives	723	495
Risk participation-out agreements | Recurring basis | Level 3
Assets:
Derivatives	0	0
Foreign exchange contracts | Recurring basis
Assets:
Derivatives	407	482
Liabilities:
Derivatives	381	459
Foreign exchange contracts | Recurring basis | Level 1
Assets:
Derivatives	0	0
Liabilities:
Derivatives	0	0
Foreign exchange contracts | Recurring basis | Level 2
Assets:
Derivatives	407	482
Liabilities:
Derivatives	381	459
Foreign exchange contracts | Recurring basis | Level 3
Assets:
Derivatives	0	0
Liabilities:
Derivatives	0	0
Risk participation-in agreements | Recurring basis
Liabilities:
Derivatives	206	137
Risk participation-in agreements | Recurring basis | Level 1
Liabilities:
Derivatives	0	0
Risk participation-in agreements | Recurring basis | Level 2
Liabilities:
Derivatives	206	137
Risk participation-in agreements | Recurring basis | Level 3
Liabilities:
Derivatives	$ 0	$ 0

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