Fair Value of Financial Instruments - Schedule of Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets:
HTM investment securities	$ 1,428,077	$ 1,485,506
AFS investment securities	1,683,215	1,140,071
Accrued interest receivable	67,953	68,516
Recurring
Assets:
AFS investment securities	1,683,215	1,140,071
Equity securities	784	759
Derivative assets	5,644	5,644
Liabilities:
Derivative liabilities	11,152	10,715
Level 1
Assets:
Cash and cash equivalents	609,330	936,473
HTM investment securities	0	0
AFS investment securities	0	0
Equity securities	784	759
Loans held for sale	0
Loans held for investment, net	0	0
Derivative assets	6	1
Accrued interest receivable	0	0
Liabilities:
Deposit accounts	0	0
FHLB advances		0
Subordinated debentures	0	0
Derivative liabilities	0	10
Accrued interest payable	0	0
Level 1 | Recurring
Assets:
AFS investment securities	0	0
Equity securities	784	759
Derivative assets	6	1
Liabilities:
Derivative liabilities	0	10
Level 1 | Interest-bearing time deposits with financial institutions
Assets:
Cash and cash equivalents	1,246	995
Level 2
Assets:
Cash and cash equivalents	0	0
HTM investment securities	1,428,077	1,485,506
AFS investment securities	1,683,215	1,140,071
Equity securities	0	0
Loans held for sale	2,425
Loans held for investment, net	0	0
Derivative assets	5,638	5,643
Accrued interest receivable	67,953	68,516
Liabilities:
Deposit accounts	14,478,071	15,003,769
FHLB advances		592,480
Subordinated debentures	267,258	320,687
Derivative liabilities	11,152	10,705
Accrued interest payable	11,589	18,671
Level 2 | Recurring
Assets:
AFS investment securities	1,683,215	1,140,071
Equity securities	0	0
Derivative assets	5,638	5,643
Liabilities:
Derivative liabilities	11,152	10,705
Level 2 | Interest-bearing time deposits with financial institutions
Assets:
Cash and cash equivalents	0	0
Level 3
Assets:
Cash and cash equivalents	0	0
HTM investment securities	0	0
AFS investment securities	0	0
Equity securities	0	0
Loans held for sale	0
Loans held for investment, net	11,575,603	12,562,323
Derivative assets	0	0
Accrued interest receivable	0	0
Liabilities:
Deposit accounts	0	0
FHLB advances		0
Subordinated debentures	0	0
Derivative liabilities	0	0
Accrued interest payable	0	0
Level 3 | Recurring
Assets:
AFS investment securities	0	0
Equity securities	0	0
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Level 3 | Interest-bearing time deposits with financial institutions
Assets:
Cash and cash equivalents	0	0
Carrying Amount
Assets:
Cash and cash equivalents	609,330	936,473
HTM investment securities	1,711,804	1,729,541
AFS investment securities	1,683,215	1,140,071
Equity securities	784	759
Loans held for sale	2,315
Loans held for investment, net	12,039,741	13,289,020
Derivative assets	5,644	5,644
Accrued interest receivable	67,953	68,516
Liabilities:
Deposit accounts	14,463,702	14,995,626
FHLB advances		600,000
Subordinated debentures	272,449	331,842
Derivative liabilities	11,152	10,715
Accrued interest payable	11,589	18,671
Carrying Amount | Interest-bearing time deposits with financial institutions
Assets:
Cash and cash equivalents	1,246	995
Estimated Fair Value
Assets:
Cash and cash equivalents	609,330	936,473
HTM investment securities	1,428,077	1,485,506
AFS investment securities	1,683,215	1,140,071
Equity securities	784	759
Loans held for sale	2,425
Loans held for investment, net	11,575,603	12,562,323
Derivative assets	5,644	5,644
Accrued interest receivable	67,953	68,516
Liabilities:
Deposit accounts	14,478,071	15,003,769
FHLB advances		592,480
Subordinated debentures	267,258	320,687
Derivative liabilities	11,152	10,715
Accrued interest payable	11,589	18,671
Estimated Fair Value | Interest-bearing time deposits with financial institutions
Assets:
Cash and cash equivalents	$ 1,246	$ 995