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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Company's Financial Instruments Measured at Fair Value on a Recurring Basis
The following fair value hierarchy tables present information about the Company’s assets measured at fair value on a recurring basis at the dates indicated:
 December 31, 2022
 Fair Value Measurement Using 
(Dollars in thousands)Level 1Level 2Level 3Total
Fair Value
Financial assets
AFS investment securities:    
U.S. Treasury$— $47,017 $— $47,017 
Agency— 431,438 — 431,438 
Corporate— 542,548 — 542,548 
Collateralized mortgage obligation— 764,229 — 764,229 
Mortgage-backed securities— 815,781 — 815,781 
Total AFS investment securities$— $2,601,013 $— $2,601,013 
Equity securities (1)
$925 $— $— $13,526 
Derivative assets:
Foreign exchange contracts$1 $— $— $1 
Interest rate swaps (2)
— 7,053 — 7,053 
Equity warrants— — 1,894 1,894 
Total derivative assets$1 $7,053 $1,894 $8,948 
Financial liabilities
Derivative liabilities:
Foreign exchange$1 $— $— $1 
Interest rate swaps— 12,530 — 12,530 
Total derivative liabilities$1 $12,530 $— $12,531 
_______________________________________________________
(1) Includes equity securities that are measured based on the NAV (or its equivalent) practical expedient of $12.6 million at December 31, 2022 and are excluded from the fair value hierarchy.
(2) Represents amounts after the application of variation margin payments as settlements with central counterparties, where applicable. See Note 19 – Derivative Instruments for additional information.
 December 31, 2021
 Fair Value Measurement Using 
(Dollars in thousands)Level 1Level 2Level 3Total
Fair Value
Financial assets
AFS investment securities:    
U.S. Treasury$— $57,866 $— $57,866 
Agency— 432,135 $— 432,135 
Corporate— 453,861 $— 453,861 
Municipal bonds— 1,089,913 — 1,089,913 
Collateralized mortgage obligation— 676,643 — 676,643 
Mortgage-backed securities— 1,563,446 — 1,563,446 
Total AFS investment securities$— $4,273,864 $— $4,273,864 
Derivative assets:
Interest rate swaps$— $10,100 $— $10,100 
Equity warrants— — 1,889 1,889 
Total derivative assets$— $10,100 $1,889 $11,989 
Financial liabilities
Derivative liabilities:
Interest rate swaps$— $5,263 $— $5,263 
Schedule of Reconciliation of Fair Value of Equity Warrants
The following table is a reconciliation of the fair value of the equity warrants that are classified as Level 3 and measured on a recurring basis as of:
(Dollars in thousands)20222021
Beginning Balance$1,889 $1,914 
Change in fair value (1)
5 (25)
Ending balance$1,894 $1,889 
______________________________________________________
(1) The changes in fair value are included in other income on the consolidated statement of income.
Schedule of Quantitative Information for Level 3 Fair Value Measurements
The following table presents quantitative information about Level 3 of fair value measurements for assets measured at fair value on a recurring basis at December 31, 2022 and 2021.
   Range
(Dollars in thousands)Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
December 31, 2022
Equity warrants$1,894 Black-Scholes
option pricing
model		Volatility
Risk-free interest rate
Marketability discount
30.00%
4.32%
6.00%
35.00%
4.41%
16.00%
31.14%
4.39%
13.60%
December 31, 2021
Equity warrants$1,889 Black-Scholes
option pricing
model		Volatility
Risk-free interest rate
Marketability discount
30.00%
0.39%
6.00%
35.00%
0.97%
16.00%
31.14%
0.52%
13.61%
The following table presents quantitative information about Level 3 of fair value measurements for assets measured at fair value on a nonrecurring basis at December 31, 2022 and 2021.
   Range
(Dollars in thousands)Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
December 31, 2022
Commercial loans
Commercial and industrial$3,180 Fair value of collateralCollateral discount and cost to sell6.00%6.00%6.00%
Total individually evaluated loans$3,180 
December 31, 2021
Investor loans secured by real estate
SBA secured by real estate (1)
$937 Fair value of collateralCollateral discount and cost to sell10.00%10.00%10.00%
Total individually evaluated loans$937 
_________________________________________________
(1) SBA loans that are collateralized by hotel/motel real property.
Schedule of Company's Financial Instruments Measured at Fair Value on a Nonrecurring Basis
The following table presents our assets measured at fair value on a nonrecurring basis at December 31, 2022 and 2021.
(Dollars in thousands)Level 1Level 2Level 3Total
Fair Value
December 31, 2022
Financial assets   
Collateral dependent loans$— $— $3,180 $3,180 

December 31, 2021
Financial assets    
Collateral dependent loans$— $— $937 $937 
Schedule of Carrying Amount and Estimated Fair Value of Financial Instruments
The fair value estimates presented herein are based on pertinent information available to management as of the dates indicated, representing an exit price.
 December 31, 2022
(Dollars in thousands)Carrying
Amount		Level 1Level 2Level 3Estimated
Fair Value
Assets:     
Cash and cash equivalents$1,101,249 $1,101,249 $— $— $1,101,249 
Interest-bearing time deposits with financial institutions1,734 1,734 — — 1,734 
HTM investment securities1,388,103 — 1,097,096 — 1,097,096 
AFS investment securities2,601,013 — 2,601,013 — 2,601,013 
Equity securities (1)
13,526 925 — — 13,526 
Loans held for sale2,643 — 2,755 — 2,755 
Loans held for investment, net14,676,298 — — 13,846,403 13,846,403 
Derivative assets (2)
8,948 1 7,053 1,894 8,948 
Accrued interest receivable73,784 — 73,784 — 73,784 
Liabilities:     
Deposit accounts17,352,401 — 17,334,219 — 17,334,219 
FHLB advances1,000,000 — 982,695 — 982,695 
Subordinated debentures331,204 — 327,609 — 327,609 
Derivative liabilities12,531 1 12,530 — 12,531 
Accrued interest payable14,661 — 14,661 — 14,661 
_________________________________________________________
(1) Includes equity securities that are measured at NAV per share (or its equivalent) as a practical expedient of $12.6 million at December 31, 2022 and are excluded from the fair value hierarchy.
(2) Represents amounts after the application of variation margin payments as settlements with central counterparties, where applicable. See Note 19 – Derivative Instruments for additional information.
 December 31, 2021
(Dollars in thousands)Carrying
Amount		Level 1Level 2Level 3Estimated
Fair Value
Assets:     
Cash and cash equivalents$304,703 $304,703 $— $— $304,703 
Interest-bearing time deposits with financial institutions2,216 2,216 — — 2,216 
HTM investment securities381,674 — 384,423 — 384,423 
AFS investment securities4,273,864 — 4,273,864 — 4,273,864 
Loans held for sale10,869 — 11,959 — 11,959 
Loans held for investment, net14,295,897 — — 14,392,684 14,392,684 
Derivative assets11,989 — 10,100 1,889 11,989 
Accrued interest receivable65,728 65,728 — — 65,728 
Liabilities: 
Deposit accounts17,115,589 16,057,316 1,058,822 — 17,116,138 
FHLB advances550,000 — 550,093 — 550,093 
Other borrowings8,000 — 8,000 — 8,000 
Subordinated debentures330,567 — 350,359 — 350,359 
Derivative liabilities5,263 — 5,263 — 5,263 
Accrued interest payable2,366 2,366 — — 2,366