Fair Value of Financial Instruments - Schedule of Estimated Fair Values and Carrying Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financial assets:
Net loans HFI	$ 12,112,607	$ 9,450,442
Interest receivable	$ 60,755	$ 49,611
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Financial liabilities:
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Carrying amount
Financial assets:
Cash and cash equivalents	$ 1,280,033	$ 1,042,488
Investment securities	1,428,401	1,538,008
Net loans HFI	12,112,607	9,450,442
Loans held for sale, at fair value	145,789	95,403
Interest receivable	60,755	49,611
Mortgage servicing rights	149,840	162,038
Derivatives	28,560	29,951
Financial liabilities:
Without stated maturities	11,117,354	9,361,140
With stated maturities	2,695,601	1,849,294
Securities sold under agreements to repurchase and federal funds purchased	107,486	13,499
Subordinated debt, net	83,338	130,704
Interest payable	16,560	24,182
Derivatives	28,414	32,383
Fair Value
Financial assets:
Cash and cash equivalents	1,280,033	1,042,488
Investment securities	1,428,401	1,538,008
Net loans HFI	12,017,272	9,221,311
Loans held for sale, at fair value	145,789	95,403
Interest receivable	60,755	49,611
Mortgage servicing rights	149,840	162,038
Derivatives	28,560	29,951
Financial liabilities:
Without stated maturities	11,117,354	9,361,140
With stated maturities	2,693,758	1,846,989
Securities sold under agreements to repurchase and federal funds purchased	107,486	13,499
Subordinated debt, net	85,504	126,684
Interest payable	16,560	24,182
Derivatives	28,414	32,383
Fair Value | Level 1
Financial assets:
Cash and cash equivalents	1,280,033	1,042,488
Investment securities	0	0
Net loans HFI	0	0
Loans held for sale, at fair value	0	0
Interest receivable	822	629
Mortgage servicing rights	0	0
Derivatives	0	0
Financial liabilities:
Without stated maturities	11,117,354	9,361,140
With stated maturities	0	0
Securities sold under agreements to repurchase and federal funds purchased	107,486	13,499
Subordinated debt, net	0	0
Interest payable	3,847	3,759
Derivatives	0	0
Fair Value | Level 2
Financial assets:
Cash and cash equivalents	0	0
Investment securities	1,428,401	1,538,008
Net loans HFI	0	0
Loans held for sale, at fair value	145,789	95,403
Interest receivable	7,384	8,012
Mortgage servicing rights	0	0
Derivatives	28,560	29,951
Financial liabilities:
Without stated maturities	0	0
With stated maturities	2,693,758	1,846,989
Securities sold under agreements to repurchase and federal funds purchased	0	0
Subordinated debt, net	0	0
Interest payable	12,713	18,923
Derivatives	28,414	32,383
Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Investment securities	0	0
Net loans HFI	12,017,272	9,221,311
Loans held for sale, at fair value	0	0
Interest receivable	52,549	40,970
Mortgage servicing rights	149,840	162,038
Derivatives	0	0
Financial liabilities:
Without stated maturities	0	0
With stated maturities	0	0
Securities sold under agreements to repurchase and federal funds purchased	0	0
Subordinated debt, net	85,504	126,684
Interest payable	0	1,500
Derivatives	$ 0	$ 0