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Securities (Tables)
 12 Months Ended
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Book Values and Fair Values of Available-for-Sale Securities
The book values and approximate fair values of investment securities at December 31, 2025 and 2024 are summarized as follows:
 20252024
 Amortized
Cost		Fair
Value		UnrealizedAmortized
Cost		Fair
Value		Unrealized
($ in thousands)Gains(Losses)Gains(Losses)
Securities available for sale:       
US Treasury securities$165,137 $168,095 $3,004 $(46)$121,051 $120,581 $— $(470)
Government-sponsored enterprise securities1,968 1,758 — (210)11,961 9,614 — (2,347)
Mortgage-backed securities2,057,381 1,860,357 4,008 (201,032)2,261,924 1,897,175 60 (364,809)
Corporate bonds18,192 18,346 193 (39)16,181 15,692 — (489)
Total available for sale$2,242,678 $2,048,556 $7,205 $(201,327)$2,411,117 $2,043,062 $60 $(368,115)
Securities held to maturity:
Mortgage-backed securities$6,735 $6,536 $— $(199)$9,198 $8,739 $— $(459)
State and local governments506,364 441,916 19 (64,467)510,800 419,832 1 (90,969)
Total held to maturity$513,099 $448,452 $19 $(64,666)$519,998 $428,571 $1 $(91,428)
Schedule of Book Values and Fair Values of Held-to-Maturity Securities
The book values and approximate fair values of investment securities at December 31, 2025 and 2024 are summarized as follows:
 20252024
 Amortized
Cost		Fair
Value		UnrealizedAmortized
Cost		Fair
Value		Unrealized
($ in thousands)Gains(Losses)Gains(Losses)
Securities available for sale:       
US Treasury securities$165,137 $168,095 $3,004 $(46)$121,051 $120,581 $— $(470)
Government-sponsored enterprise securities1,968 1,758 — (210)11,961 9,614 — (2,347)
Mortgage-backed securities2,057,381 1,860,357 4,008 (201,032)2,261,924 1,897,175 60 (364,809)
Corporate bonds18,192 18,346 193 (39)16,181 15,692 — (489)
Total available for sale$2,242,678 $2,048,556 $7,205 $(201,327)$2,411,117 $2,043,062 $60 $(368,115)
Securities held to maturity:
Mortgage-backed securities$6,735 $6,536 $— $(199)$9,198 $8,739 $— $(459)
State and local governments506,364 441,916 19 (64,467)510,800 419,832 1 (90,969)
Total held to maturity$513,099 $448,452 $19 $(64,666)$519,998 $428,571 $1 $(91,428)
Schedule of Information Regarding Securities with Unrealized Losses
The following table presents information regarding all securities with unrealized losses at December 31, 2025:
Securities in an Unrealized
Loss Position for
Less than 12 Months		Securities in an Unrealized
Loss Position for
More than 12 Months		Total
($ in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
US Treasury securities$19,959 $46 $— $— $19,959 $46 
Government-sponsored enterprise securities— — 1,758 210 1,758 210 
Mortgage-backed securities157,405 684 1,074,038 200,547 1,231,443 201,231 
Corporate bonds3,711 39 — — 3,711 39 
State and local governments— — 436,511 64,467 436,511 64,467 
Total temporarily impaired securities$181,075 $769 $1,512,307 $265,224 $1,693,382 $265,993 
The following table presents information regarding all securities with unrealized losses at December 31, 2024:
Securities in an Unrealized
Loss Position for
Less than 12 Months		Securities in an Unrealized
Loss Position for
More than 12 Months		Total
($ in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
US Treasury securities$120,581 $470 $— $— $120,581 $470 
Government-sponsored enterprise securities— — 9,614 2,347 9,614 2,347 
Mortgage-backed securities317,015 1,845 1,538,156 363,423 1,855,171 365,268 
Corporate bonds380 51 13,562 438 13,942 489 
State and local governments4,513 75 414,331 90,894 418,844 90,969 
Total temporarily impaired securities$442,489 $2,441 $1,975,663 $457,102 $2,418,152 $459,543 
Schedule of Book Values and Approximate Fair Values of Investment Securities by Contractual Maturity
The book values and fair values of investment securities at December 31, 2025, by contractual maturity, are summarized in the table below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
 Securities Available for SaleSecurities Held to Maturity
($ in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due within one year$— $— $— $— 
Due after one year but within five years149,881 152,847 8,872 8,587 
Due after five years but within ten years35,416 35,352 243,080 214,751 
Due after ten years— — 254,412 218,578 
Mortgage-backed securities2,057,381 1,860,357 6,735 6,536 
Total securities$2,242,678 $2,048,556 $513,099 $448,452