Fair Value of Financial Instruments - Schedule of Estimated Fair Values and Carrying Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financial assets:
Net loans held for investment	$ 9,258,457	$ 9,164,020
Interest receivable	52,715	45,684
Derivatives	34,738	48,769
Financial liabilities:
Derivatives	38,215	63,229
Carrying amount
Financial assets:
Cash and cash equivalents	810,932	1,027,052
Investment securities	1,471,973	1,474,176
Net loans held for investment	9,258,457	9,164,020
Loans held for sale, at fair value	46,618	113,240
Interest receivable	52,715	45,684
Mortgage servicing rights	164,249	168,365
Derivatives	34,738	48,769
Financial liabilities:
Without stated maturities	8,927,654	9,433,860
With stated maturities	1,620,633	1,421,974
Securities sold under agreements to repurchase and federal funds purchased	108,764	86,945
Bank Term Funding Program	130,000
Federal Home Loan Bank advances		175,000
Subordinated debt, net	129,645	126,101
Interest payable	18,809	8,648
Derivatives	38,215	63,229
Fair Value
Financial assets:
Cash and cash equivalents	810,932	1,027,052
Investment securities	1,471,973	1,474,176
Net loans held for investment	9,068,518	9,048,943
Loans held for sale, at fair value	46,618	113,240
Interest receivable	52,715	45,684
Mortgage servicing rights	164,249	168,365
Derivatives	34,738	48,769
Financial liabilities:
Without stated maturities	8,927,654	9,433,860
With stated maturities	1,614,400	1,422,544
Securities sold under agreements to repurchase and federal funds purchased	108,764	86,945
Bank Term Funding Program	130,000
Federal Home Loan Bank advances		175,000
Subordinated debt, net	122,671	118,817
Interest payable	18,809	8,648
Derivatives	38,215	63,229
Fair Value | Level 1
Financial assets:
Cash and cash equivalents	810,932	1,027,052
Investment securities	0	0
Net loans held for investment	0	0
Loans held for sale, at fair value	0	0
Interest receivable	388	126
Mortgage servicing rights	0	0
Derivatives	0	0
Financial liabilities:
Without stated maturities	8,927,654	9,433,860
With stated maturities	0	0
Securities sold under agreements to repurchase and federal funds purchased	108,764	86,945
Bank Term Funding Program	0
Federal Home Loan Bank advances		0
Subordinated debt, net	0	0
Interest payable	4,104	2,571
Derivatives	0	0
Fair Value | Level 2
Financial assets:
Cash and cash equivalents	0	0
Investment securities	1,471,973	1,474,176
Net loans held for investment	0	0
Loans held for sale, at fair value	46,618	82,750
Interest receivable	8,551	6,961
Mortgage servicing rights	0	0
Derivatives	34,738	48,769
Financial liabilities:
Without stated maturities	0	0
With stated maturities	1,614,400	1,422,544
Securities sold under agreements to repurchase and federal funds purchased	0	0
Bank Term Funding Program	130,000
Federal Home Loan Bank advances		175,000
Subordinated debt, net	0	0
Interest payable	13,205	4,559
Derivatives	38,215	63,229
Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Investment securities	0	0
Net loans held for investment	9,068,518	9,048,943
Loans held for sale, at fair value	0	30,490
Interest receivable	43,776	38,597
Mortgage servicing rights	164,249	168,365
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
Bank Term Funding Program	0
Federal Home Loan Bank advances		0
Subordinated debt, net	122,671	118,817
Interest payable	1,500	1,518
Derivatives	$ 0	$ 0