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Securities Available for Sale (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Securities, Available-for-Sale [Abstract]  
Schedule of Available-for-sale and Held-to-maturity Securities Reconciliation
The following is a summary of investment securities as of the dates indicated:
 December 31, 2022December 31, 2021
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses
Fair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (Dollars in thousands)
Debt securities available for sale:
U.S. Treasury securities$3,990 $— $(104)$3,886 $— $— $— $— 
U.S. Government agency and U.S. Government sponsored enterprises:
Agency securities4,000 — (133)3,867 — — — — 
Collateralized mortgage obligations947,541 — (153,842)793,699 1,039,543 3,357 (16,470)1,026,430 
Mortgage-backed securities:
Residential544,084 — (90,907)453,177 769,113 1,985 (11,874)759,224 
Commercial417,241 — (48,954)368,287 595,659 9,103 (5,360)599,402 
Asset-backed securities153,539 — (5,935)147,604 153,564 11 (124)153,451 
Corporate securities23,351 — (4,494)18,857 23,398 130 (1,044)22,484 
Municipal securities195,675 790 (13,713)182,752 104,371 1,680 (767)105,284 
Total investment securities available for sale$2,289,421 $790 $(318,082)$1,972,129 $2,685,648 $16,266 $(35,639)$2,666,275 
Debt securities held to maturity:
U.S. Government agency and U.S. Government sponsored enterprises:
Mortgage-backed securities:
Residential$157,881 $— $(7,041)$150,840 $— $— $— $— 
Commercial113,185 1 (5,619)107,567 — — — — 
Total investment securities held to maturity$271,066 $1 $(12,660)$258,407 $— $— $— $— 
Schedule of Realized Gain (Loss)
The proceeds from sales of securities and total gains and losses are listed below:
Year Ended December 31,
 202220212020
 (Dollars in thousands)
Proceeds from investments sold$— $— $168,069 
Gains from sales of securities$— $— $7,531 
Losses from sales of securities— — — 
Gains from called securities— — — 
Net gain on sales or called securities$— $— $7,531 
Interest Income
The following table presents a breakdown of interest income recorded for investment securities that are taxable and nontaxable.
 Year Ended December 31,
 202220212020
 (Dollars in thousands)
Interest income on investment securities
Taxable$50,043 $34,583 $37,534 
Nontaxable2,177 909 1,828 
Total$52,220 $35,492 $39,362 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of investment securities at December 31, 2022, by contractual maturity, are presented in the table below. Collateralized mortgage obligations, mortgage-backed securities, and asset-backed securities are presented by final maturity. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties.
Available for SaleHeld to Maturity
Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
 (Dollars in thousands)
Debt securities:
Due within one year$2,307 $2,267 $— $— 
Due after one year through five years135,796 126,723 7,742 7,561 
Due after five years through ten years131,656 118,654 28,254 27,241 
Due after ten years2,019,662 1,724,485 235,070 223,605 
Total$2,289,421 $1,972,129 $271,066 $258,407 
Schedule of Gross Unrealized Losses and Estimated Fair Values of Investments
The following tables show the Company’s investments’ gross unrealized losses and estimated fair values, aggregated by investment category and the length of time that the individual securities have been in a continuous unrealized loss position as of the dates indicated. The length of time that the individual securities have been in a continuous unrealized loss position is not a factor in determining credit impairment with the adoption of CECL.    
December 31, 2022
Less than 12 months12 months or longerTotal
Description of
Securities AFS		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses
  (Dollars in thousands)
U.S. Treasury securities1 $3,886 $(104)— $— $— 1 $3,886 $(104)
Agency securities*1 3,867 (133)— — — 1 3,867 (133)
Collateralized mortgage obligations*
61 150,419 (14,888)59 643,280 (138,954)120 793,699 (153,842)
Mortgage-backed securities:
Residential*23 55,645 (5,616)42 397,532 (85,291)65 453,177 (90,907)
Commercial*29 172,963 (12,156)26 195,324 (36,798)55 368,287 (48,954)
Asset-backed securities3 21,836 (716)15 125,768 (5,219)18 147,604 (5,935)
Corporate securities1 3,401 (600)5 15,456 (3,894)6 18,857 (4,494)
Municipal securities31 76,942 (3,207)32 65,730 (10,506)63 142,672 (13,713)
Total150 $488,959 $(37,420)179 $1,443,090 $(280,662)329 $1,932,049 $(318,082)


December 31, 2021
Less than 12 months12 months or longerTotal
Description of
Securities AFS		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses
  (Dollars in thousands)
Collateralized mortgage obligations*
39 $757,799 $(15,445)2 $37,438 $(1,025)41 $795,237 $(16,470)
Mortgage-backed securities:
Residential*49 603,372 (9,371)13 75,211 (2,503)62 678,583 (11,874)
Commercial*24 214,384 (3,339)4 57,656 (2,021)28 272,040 (5,360)
Asset-backed securities13 115,885 (124)— — — 13 115,885 (124)
Corporate securities4 14,067 (331)1 4,288 (713)5 18,355 (1,044)
Municipal securities23 59,403 (767)— — — 23 59,403 (767)
Total152 $1,764,910 $(29,377)20 $174,593 $(6,262)172 $1,939,503 $(35,639)
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* Investments in U.S. Government agency and U.S. Government sponsored enterprises