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Fair Value of Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Summary of Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented:

 December 31, 2021
(Dollars in thousands)TotalLevel 1Level 2Level 3
Available-for-sale securities
U.S. Treasury$— $— $— $— 
U.S. Government agencies52,507 — 52,507 — 
Municipal165,594 — 59,907 105,687 
Corporate notes95,704 — 95,704 — 
Mortgage-backed2,013,988 — 2,013,988 — 
Trading account securities1,061 — 1,061 — 
Equity securities with readily determinable fair value90,511 82,445 8,066 — 
Mortgage loans held-for-sale817,912 — 817,912 — 
Loans held-for-investment38,598 — 22,707 15,891 
MSRs147,571 — — 147,571 
Nonqualified deferred compensations assets16,240 — 16,240 — 
Derivative assets165,008 — 154,448 10,560 
Total$3,604,694 $82,445 $3,242,540 $279,709 
Derivative liabilities$123,000 $— $123,000 $— 
 December 31, 2020
(Dollars in thousands)TotalLevel 1Level 2Level 3
Available-for-sale securities
U.S. Treasury$304,971 $304,971 $— $— 
U.S. Government agencies84,513 — 82,547 1,966 
Municipal146,910 — 37,034 109,876 
Corporate notes91,405 — 91,405 — 
Mortgage-backed2,428,040 — 2,428,040 — 
Trading account securities671 — 671 — 
Equity securities with readily determinable fair value90,862 82,796 8,066 — 
Mortgage loans held-for-sale1,272,090 — 1,272,090 — 
Loans held-for-investment55,134 — 44,854 10,280 
MSRs92,081 — — 92,081 
Nonqualified deferred compensations assets15,398 — 15,398 — 
Derivative assets278,423 — 230,332 48,091 
Total$4,860,498 $387,767 $4,210,437 $262,294 
Derivative liabilities$288,465 $— $288,465 $— 
Summary of Changes in Level Three Assets and Liabilities Measured at Fair Value on a Recurring Basis
The changes in Level 3 assets measured at fair value on a recurring basis during the years ended December 31, 2021 and 2020 are summarized as follows:
U.S. Government AgenciesLoans held-for-investmentMSRsDerivative assets
(Dollars in thousands)Municipal
Balance at January 1, 2021
$109,876 $1,966 $10,280 $92,081 $48,091 
Total net gains (losses) included in:
Net income (1)
— (4)(293)55,490 (37,531)
Other comprehensive income(4,830)(24)— — — 
Purchases38,727 — — — — 
Issuances— — — — — 
Sales— — — — — 
Settlements(38,086)(1,938)(4,653)— — 
Net transfers into/(out of) Level 3— — 10,557 — — 
Balance at December 31, 2021
$105,687 $— $15,891 $147,571 $10,560 

(Dollars in thousands)MunicipalU.S. Government AgenciesLoans held-for-investmentMSRsDerivative assets
Balance at January 1, 2020
$111,950 $2,646 $9,620 $85,638 $2,631 
Total net gains (losses) included in:
Net income (1)
— — 184 6,443 45,460 
Other comprehensive income(1,302)(50)— — — 
Purchases39,365 — — — — 
Issuances— — — — — 
Sales— — — — — 
Settlements(40,137)(630)(21,025)— — 
Net transfers into/(out of) Level 3— — 21,501 — — 
Balance at December 31, 2020
$109,876 $1,966 $10,280 $92,081 $48,091 
(1)Changes in the balance of MSRs and derivative assets related to fair value adjustments are recorded as a component of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income.
Summary of Assets Measured at Fair Value on a Nonrecurring Basis For assets measured at fair value on a nonrecurring basis that were still held in the balance sheet at the end of the period, the following table provides the carrying value of the related individual assets or portfolios at December 31, 2021.
 
 December 31, 2021
Year Ended
December 31, 2021
Fair Value Losses
Recognized, net
(Dollars in thousands)TotalLevel 1Level 2Level 3
Individually assessed loans - foreclosure probable and collateral-dependent$63,415 $— $— $63,415 $26,341 
Other real estate owned (1)
4,271 — — 4,271 1,197 
Total$67,686 $— $— $67,686 $27,538 
(1)Fair value losses recognized, net on other real estate owned include valuation adjustments and charge-offs during the respective period.
Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Nonrecurring
The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at December 31, 2021 were as follows:
(Dollars in thousands)
Fair ValueValuation MethodologySignificant Unobservable InputRange
of Inputs		Weighted
Average
of Inputs		Impact to valuation
from an increased or
higher input value
Measured at fair value on a recurring basis:
Municipal securities$105,687 Bond pricingEquivalent ratingBBB-AA+N/AIncrease
Loans held-for-investment15,891 Discounted cash flowsDiscount rate3.00%3.00%Decrease
Credit discount
0%-3%
0.57%Decrease
Constant prepayment rate (CPR)11.64%11.64%Decrease
MSRs147,571 Discounted cash flowsDiscount rate
6%-19%
9.80%Decrease
Constant prepayment rate (CPR)
0%-83%
11.64%Decrease
Cost of servicing
$70-$200
$75 Decrease
Cost of servicing - delinquent
$200-1,000
$312 Decrease
Derivatives10,560 Discounted cash flowsPull-through rate
26%-100%
85.78 %Increase
Measured at fair value on a non-recurring basis:
Impaired loans—collateral based63,415 Appraisal valueAppraisal adjustment - cost of sale10%10.00%Decrease
Other real estate owned4,271 Appraisal valueAppraisal adjustment - cost of sale10%10.00%Decrease
Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments The table below presents the carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown:
 December 31, 2021December 31, 2020
(Dollars in thousands)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Financial Assets:
Cash and cash equivalents$411,205 $411,205 $322,474 $322,474 
Securities sold under agreements to repurchase with original maturities exceeding three months700,000 700,000 — — 
Interest-bearing deposits with banks5,372,603 5,372,603 4,802,527 4,802,527 
Available-for-sale securities2,327,793 2,327,793 3,055,839 3,055,839 
Held-to-maturity securities2,942,285 2,900,694 579,138 593,767 
Trading account securities1,061 1,061 671 671 
Equity securities with readily determinable fair value90,511 90,511 90,862 90,862 
FHLB and FRB stock, at cost135,378 135,378 135,588 135,588 
Brokerage customer receivables26,068 26,068 17,436 17,436 
Mortgage loans held-for-sale, at fair value817,912 817,912 1,272,090 1,272,090 
Loans held-for-investment, at fair value38,598 38,598 55,134 55,134 
Loans held-for-investment, at amortized cost34,750,506 35,297,878 32,023,939 31,871,683 
Nonqualified deferred compensation assets16,240 16,240 15,398 15,398 
Derivative assets165,008 165,008 278,423 278,423 
Accrued interest receivable and other268,921 268,921 272,339 272,339 
Total financial assets$48,064,089 $48,569,870 $42,921,858 $42,784,231 
Financial Liabilities:
Non-maturity deposits$38,126,796 $38,126,796 $32,116,023 $32,116,023 
Deposits with stated maturities3,968,789 3,965,372 4,976,628 4,969,849 
FHLB advances1,241,071 1,186,280 1,228,429 1,172,315 
Other borrowings494,136 494,670 518,928 518,928 
Subordinated notes436,938 472,684 436,506 473,093 
Junior subordinated debentures253,566 212,226 253,566 204,713 
Derivative liabilities123,000 123,000 288,465 288,465 
Accrued interest payable9,304 9,304 15,645 15,645 
Total financial liabilities$44,653,600 $44,590,332 $39,834,190 $39,759,031