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Securities (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Book Values and Fair Values of Available-for-Sale Securities
The book values and approximate fair values of investment securities at September 30, 2024 and December 31, 2023 are summarized as follows:
($ in thousands)September 30, 2024December 31, 2023
Amortized
Cost		Fair
Value		UnrealizedAmortized
Cost		Fair
Value		Unrealized
Gains(Losses)Gains(Losses)
Securities available for sale:
U.S. Treasuries$— $— $— $— $174,785 $172,570 $— $(2,215)
Government-sponsored enterprise securities71,968 62,872 — (9,096)71,964 60,266 — (11,698)
Mortgage-backed securities2,150,849 1,828,802 39 (322,086)2,323,674 1,937,784 30 (385,920)
Corporate bonds16,179 15,784 — (395)19,676 18,759 — (917)
Total available for sale$2,238,996 $1,907,458 $39 $(331,577)$2,590,099 $2,189,379 $30 $(400,750)
Securities held to maturity:
Mortgage-backed securities$9,923 $9,564 $— $(359)$12,085 $11,447 $— $(638)
State and local governments511,878 438,736 29 (73,171)521,593 438,176 39 (83,456)
Total held to maturity$521,801 $448,300 $29 $(73,530)$533,678 $449,623 $39 $(84,094)
Book Values and Fair Values of Held-to-Maturity Securities
The book values and approximate fair values of investment securities at September 30, 2024 and December 31, 2023 are summarized as follows:
($ in thousands)September 30, 2024December 31, 2023
Amortized
Cost		Fair
Value		UnrealizedAmortized
Cost		Fair
Value		Unrealized
Gains(Losses)Gains(Losses)
Securities available for sale:
U.S. Treasuries$— $— $— $— $174,785 $172,570 $— $(2,215)
Government-sponsored enterprise securities71,968 62,872 — (9,096)71,964 60,266 — (11,698)
Mortgage-backed securities2,150,849 1,828,802 39 (322,086)2,323,674 1,937,784 30 (385,920)
Corporate bonds16,179 15,784 — (395)19,676 18,759 — (917)
Total available for sale$2,238,996 $1,907,458 $39 $(331,577)$2,590,099 $2,189,379 $30 $(400,750)
Securities held to maturity:
Mortgage-backed securities$9,923 $9,564 $— $(359)$12,085 $11,447 $— $(638)
State and local governments511,878 438,736 29 (73,171)521,593 438,176 39 (83,456)
Total held to maturity$521,801 $448,300 $29 $(73,530)$533,678 $449,623 $39 $(84,094)
Schedule of Information Regarding Securities with Unrealized Losses
The following table presents information regarding all securities with unrealized losses at September 30, 2024:
Securities in an Unrealized
Loss Position for
Less than Twelve Months		Securities in an Unrealized
Loss Position for
More than Twelve Months		Total
($ in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
Government-sponsored enterprise securities$— $— $62,872 $9,096 $62,872 $9,096 
Mortgage-backed securities318 — 1,835,466 322,445 1,835,784 322,445 
Corporate bonds380 49 13,654 346 14,034 395 
State and local governments520 — 433,118 73,171 433,638 73,171 
Total unrealized loss position$1,218 $49 $2,345,110 $405,058 $2,346,328 $405,107 
The following table presents information regarding all securities with unrealized losses at December 31, 2023:
Securities in an Unrealized
Loss Position for
Less than Twelve Months		Securities in an Unrealized
Loss Position for
More than Twelve Months		Total
($ in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
U.S. Treasuries$— $— $172,570 $2,215 $172,570 $2,215 
Government-sponsored enterprise securities— — 60,266 11,698 60,266 11,698 
Mortgage-backed securities1,117 5 1,945,830 386,553 1,946,947 386,558 
Corporate bonds— — 17,008 917 17,008 917 
State and local governments— — 432,476 83,456 432,476 83,456 
Total unrealized loss position$1,117 $5 $2,628,150 $484,839 $2,629,267 $484,844 
Schedule of Book Values and Approximate Fair Values of Investment Securities by Contractual Maturity
The book values and fair values of investment securities at September 30, 2024, by contractual maturity, are summarized in the table below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
 Securities Available for SaleSecurities Held to Maturity
($ in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due after one year but within five years$39,996 $35,320 $5,394 $5,289 
Due after five years but within ten years48,151 43,336 183,914 159,345 
Due after ten years— — 322,570 274,102 
Mortgage-backed securities2,150,849 1,828,802 9,923 9,564 
Total securities$2,238,996 $1,907,458 $521,801 $448,300