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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Company's assets 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, 2020
 Fair Value Measurement Using 
 Level 1Level 2Level 3Securities at
Fair Value
 (Dollars in thousands)
Financial assets
Investment securities available-for-sale:    
U.S. Treasury$— $32,533 $— $32,533 
Agency— 690,386 — 690,386 
Corporate— 415,308 — 415,308 
Municipal bonds— 1,446,019 — 1,446,019 
Collateralized mortgage obligation: residential— 513,366 — 513,366 
Mortgage-backed securities: residential— 833,503 — 833,503 
Total securities available-for-sale$— $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 

 At December 31, 2019
 Fair Value Measurement Using 
 Level 1Level 2Level 3Securities at
Fair Value
 (Dollars in thousands)
Financial assets
Investment securities available-for-sale:    
U.S. Treasury$— $63,555 $— $63,555 
Agency— 246,358 $— 246,358 
Corporate— 151,353 $— 151,353 
Municipal bonds— 397,298 — 397,298 
Collateralized mortgage obligation: residential— 9,984 — 9,984 
Mortgage-backed securities: residential— 499,836 — 499,836 
Total securities available-for-sale$— $1,368,384 $— $1,368,384 
Derivative assets$— $2,103 $— $2,103 
Financial liabilities
Derivative liabilities$— $2,103 $— $2,103 
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:
2020
(Dollars in thousands)
Beginning Balance as of June 1, 2020$5,162 
Change in fair value (1)
(41)
Sales(3,207)
Ending balance as of December 31, 2020$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, 2020.
 December 31, 2020
   Range
 Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
(Dollars in thousands)
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, 2020 and 2019.
 December 31, 2020
   Range
 Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
(Dollars in thousands)
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 
 December 31, 2019
 Range
 Fair ValueValuation Technique(s)Unobservable Input(s)MinMaxWeighted Average
(Dollars in thousands)
Investor loans secured by real estate
CRE non-owner-occupied$569 Fair value of collateralCollateral discount and cost to sell10.00%10.00%10.00%
SBA secured by real estate (1)
408 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)
140 Fair value of collateralCollateral discount and cost to sell7.00%10.00%7.81%
Commercial loans
SBA non-real estate secured1,140 Fair value of collateralCollateral discount and cost to sell7.00%63.00%15.33%
Total individually evaluated loans$2,257 
______________________________
(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.
Summary of assets 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, 2020 and 2019.

 At December 31, 2020
 Level 1Level 2Level 3Total
Fair Value
 (Dollars in thousands)
Financial assets   
Individually evaluated loans$— $— $4,077 $4,077 

 At December 31, 2019
 Level 1Level 2Level 3Total
Fair Value
 (Dollars in thousands)
Financial assets    
Impaired loans$— $— $2,257 $2,257 
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, 2020
 Carrying
Amount
Level 1Level 2Level 3Estimated
Fair Value
 (Dollars in thousands)
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 
 At December 31, 2019
 Carrying
Amount
Level 1Level 2Level 3Estimated
Fair Value
 (Dollars in thousands)
Assets:     
Cash and cash equivalents$326,850 $326,850 $— $— $326,850 
Interest-bearing time deposits with financial institutions2,708 2,708 — — 2,708 
Investments held-to-maturity37,838 — 38,760 — 38,760 
Investment securities available-for-sale1,368,384 — 1,368,384 — 1,368,384 
Loans held for sale1,672 — 1,821 — 1,821 
Loans held for investment, net8,722,311 — — 8,691,019 8,691,019 
Derivative asset2,103 — 2,103 — 2,103 
Accrued interest receivable39,442 39,442 — — 39,442 
Liabilities: 
Deposit accounts8,898,509 7,850,667 1,048,583 — 8,899,250 
FHLB advances517,026 — 517,291 — 517,291 
Subordinated debentures215,145 — 237,001 — 237,001 
Derivative liability2,103 — 2,103 — 2,103 
Accrued interest payable2,686 2,686 — — 2,686