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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2021
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:
 
 At December 31, 2021
 Fair Value Measurement Using 
(Dollars in thousands)Level 1Level 2Level 3Securities at
Fair Value
Financial assets
Investment securities available-for-sale:    
U.S. Treasury$— $57,866 $— $57,866 
Agency— 432,135 — 432,135 
Corporate— 453,861 — 453,861 
Municipal bonds— 1,089,913 — 1,089,913 
Collateralized mortgage obligation— 676,643 — 676,643 
Mortgage-backed securities— 1,563,446 — 1,563,446 
Total securities available-for-sale$— $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 $11,989 
Financial liabilities
Derivative liabilities$— $5,263 $— $5,263 

 At December 31, 2020
 Fair Value Measurement Using 
(Dollars in thousands)Level 1Level 2Level 3Securities at
Fair Value
Financial assets
Investment securities available-for-sale:    
U.S. Treasury$— $32,533 $— $32,533 
Agency— 690,386 $— 690,386 
Corporate— 415,308 $— 415,308 
Municipal bonds— 1,446,019 — 1,446,019 
Collateralized mortgage obligation— 513,366 — 513,366 
Mortgage-backed securities— 833,503 — 833,503 
Total securities available-for-sale$— $3,931,115 $— $3,931,115 
Derivative assets:
Interest rate swaps$— $12,053 $— $12,053 
Equity warrants— — 1,914 1,914 
Total derivative assets$— $12,053 $1,914 $13,967 
Financial liabilities
Derivative liabilities$— $12,066 $— $12,066 
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)20212020
Beginning Balance$1,914 $5,162 
Change in fair value (1)
(25)(41)
Sales— (3,207)
Ending balance$1,889 $1,914 
______________________________
(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, 2021.
 December 31, 2021
   Range
(Dollars in thousands)Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
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%

 December 31, 2020
   Range
(Dollars in thousands)Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
Equity warrants$1,914 Black-Scholes
option pricing
model
Volatility
Risk-free interest rate
Marketability discount
30.00%
0.13%
6.00%
35.00%
0.36%
16.00%
31.19%
0.18%
13.51%
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, 2021 and 2020.
 December 31, 2021
   Range
(Dollars in thousands)Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
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 

 December 31, 2020
 Range
(Dollars in thousands)Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
Investor loans secured by real estate
CRE non-owner-occupied$198 Fair value of collateralCollateral discount and cost to sell10.00%10.00%10.00%
SBA secured by real estate (1)
746 Fair value of collateralCollateral discount and cost to sell10.00%10.00%10.00%
Business loans secured by real estate
SBA secured by real estate (2)
386 Fair value of collateralCollateral discount and cost to sell7.00%10.00%9.09%
Commercial loans
Commercial and industrial2,040 Fair value of collateralCollateral discount and cost to sell7.00%10.00%9.06%
SBA non-real estate secured707 Fair value of collateralCollateral discount and cost to sell7.00%7.00%7.00%
Total individually evaluated loans$4,077 
______________________________
(1) SBA loans that are collateralized by hotel/motel real property.
(2) SBA loans that are collateralized by real property other than 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, 2021 and 2020.

 At December 31, 2021
(Dollars in thousands)Level 1Level 2Level 3Total
Fair Value
Financial assets   
Collateral dependent loans$— $— $937 $937 

 At December 31, 2020
(Dollars in thousands)Level 1Level 2Level 3Total
Fair Value
Financial assets    
Collateral dependent loans$— $— $4,077 $4,077 
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.
 At 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 
Investments held-to-maturity381,674 — 384,423 — 384,423 
Investment securities available-for-sale4,273,864 — 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 asset11,989 — 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 liability5,263 — 5,263 — 5,263 
Accrued interest payable2,366 2,366 — — 2,366 

 At December 31, 2020
(Dollars in thousands)Carrying
Amount
Level 1Level 2Level 3Estimated
Fair Value
Assets:     
Cash and cash equivalents$880,766 $880,766 $— $— $880,766 
Interest-bearing time deposits with financial institutions2,845 2,845 — — 2,845 
Investments held-to-maturity23,732 — 25,013 — 25,013 
Investment securities available-for-sale3,931,115 — 3,931,115 — 3,931,115 
Loans held for sale601 — 645 — 645 
Loans held for investment, net13,236,433 — — 13,351,092 13,351,092 
Derivative asset13,967 — 12,053 1,914 13,967 
Accrued interest receivable74,574 74,574 — — 74,574 
Liabilities: 
Deposit accounts16,214,177 14,587,335 1,631,047 — 16,218,382 
FHLB advances31,000 — 31,564 — 31,564 
Subordinated debentures501,511 — 544,436 — 544,436 
Derivative liability12,066 — 12,066 — 12,066 
Accrued interest payable6,569 6,569 — — 6,569