Disclosures About Fair Value of Financial Instruments - Nonrecurring Assets that had Fair Market Values Below the Carrying Amount (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Level 1
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans individually assessed	$ 0	$ 0
Total assets	283,093	289,938
Level 2
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans individually assessed	0	0
Total assets	2,303,891	2,217,616
Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans individually assessed	12,637,708	12,418,154
Total assets	12,646,526	12,441,208
Nonrecurring
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Real estate owned, net	2,772	76
Total assets	39,485	38,774
Nonrecurring \| Loans individually assessed
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans individually assessed	36,713	38,698
Nonrecurring \| Level 1
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Real estate owned, net	0	0
Total assets	0	0
Nonrecurring \| Level 1 \| Loans individually assessed
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans individually assessed	0	0
Nonrecurring \| Level 2
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Real estate owned, net	0	0
Total assets	0	0
Nonrecurring \| Level 2 \| Loans individually assessed
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans individually assessed	0	0
Nonrecurring \| Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Real estate owned, net	2,772	76
Total assets	39,485	38,774
Nonrecurring \| Level 3 \| Loans individually assessed
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans individually assessed	$ 36,713	$ 38,698