Fair Value of Financial Instruments - Schedule of Estimated Fair Values and Carrying Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial assets:
Net loans held for investment	$ 9,621,005	$ 9,450,442
Interest receivable	$ 51,268	$ 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	$ 794,706	$ 1,042,488
Investment securities	1,580,720	1,538,008
Net loans held for investment	9,621,005	9,450,442
Loans held for sale, at fair value	145,618	95,403
Interest receivable	51,268	49,611
Mortgage servicing rights	156,379	162,038
Derivatives	26,150	29,951
Financial liabilities:
Without stated maturities	9,423,800	9,361,140
With stated maturities	1,778,198	1,849,294
Securities sold under agreements to repurchase and federal funds purchased	9,787	13,499
Subordinated debt, net	130,801	130,704
Interest payable	18,813	24,182
Derivatives	24,621	32,383
Fair Value
Financial assets:
Cash and cash equivalents	794,706	1,042,488
Investment securities	1,580,720	1,538,008
Net loans held for investment	9,443,311	9,221,311
Loans held for sale, at fair value	145,618	95,403
Interest receivable	51,268	49,611
Mortgage servicing rights	156,379	162,038
Derivatives	26,150	29,951
Financial liabilities:
Without stated maturities	9,423,800	9,361,140
With stated maturities	1,774,652	1,846,989
Securities sold under agreements to repurchase and federal funds purchased	9,787	13,499
Subordinated debt, net	127,531	126,684
Interest payable	18,813	24,182
Derivatives	24,621	32,383
Fair Value | Level 1
Financial assets:
Cash and cash equivalents	794,706	1,042,488
Investment securities	0	0
Net loans held for investment	0	0
Loans held for sale, at fair value	0	0
Interest receivable	879	629
Mortgage servicing rights	0	0
Derivatives	0	0
Financial liabilities:
Without stated maturities	9,423,800	9,361,140
With stated maturities	0	0
Securities sold under agreements to repurchase and federal funds purchased	9,787	13,499
Subordinated debt, net	0	0
Interest payable	3,640	3,759
Derivatives	0	0
Fair Value | Level 2
Financial assets:
Cash and cash equivalents	0	0
Investment securities	1,580,720	1,538,008
Net loans held for investment	0	0
Loans held for sale, at fair value	145,618	95,403
Interest receivable	7,009	8,012
Mortgage servicing rights	0	0
Derivatives	26,150	29,951
Financial liabilities:
Without stated maturities	0	0
With stated maturities	1,774,652	1,846,989
Securities sold under agreements to repurchase and federal funds purchased	0	0
Subordinated debt, net	0	0
Interest payable	14,798	18,923
Derivatives	24,621	32,383
Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Investment securities	0	0
Net loans held for investment	9,443,311	9,221,311
Loans held for sale, at fair value	0	0
Interest receivable	43,380	40,970
Mortgage servicing rights	156,379	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	127,531	126,684
Interest payable	375	1,500
Derivatives	$ 0	$ 0