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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Summary of Financial Instruments Measured at Fair Value on a Recurring Basis
The following table summarizes financial instruments measured at fair value on a recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value.
 December 31, 2023
($ in thousands)Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total Fair
Value
Assets
Securities available-for-sale
Obligations of U.S. Government-sponsored enterprises$— $296,446 $— $296,446 
Obligations of states and political subdivisions— 432,171 — 432,171 
Residential mortgage-backed securities— 700,381 — 700,381 
Corporate debt securities— 181,701 — 181,701 
U.S. Treasury Bills— 7,574 — 7,574 
Total securities available-for-sale— 1,618,273 — 1,618,273 
Other investments— 2,941 — 2,941 
Derivatives— 17,789 — 17,789 
Total assets$— $1,639,003 $— $1,639,003 
Liabilities
Derivatives$— $16,184 $— $16,184 
Total liabilities$— $16,184 $— $16,184 

 December 31, 2022
($ in thousands)Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total Fair
Value
Assets
Securities available-for-sale
Obligations of U.S. Government-sponsored enterprises$— $237,785 $— $237,785 
Obligations of states and political subdivisions— 417,444 — 417,444 
Residential mortgage-backed securities— 659,404 — 659,404 
Corporate debt securities— 12,640 — 12,640 
U.S. Treasury Bills— 208,534 — 208,534 
Total securities available-for-sale— 1,535,807 — 1,535,807 
Other investments— 2,667 — 2,667 
Derivative financial instruments— 22,958 — 22,958 
Total assets$— $1,561,432 $— $1,561,432 
Liabilities
Derivative financial instruments$— $21,581 $— $21,581 
Total liabilities$— $21,581 $— $21,581 
Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis
The following tables present financial instruments and non-financial assets still held as of the reporting date measured at fair value on a non-recurring basis. 
December 31, 2023
(1)(1)(1)(1)
($ in thousands)Total Fair ValueQuoted Prices in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Individually-evaluated loans$5,138 $— $— $5,138 
Other real estate5,736 — — 5,736 
Total$10,874 $— $— $10,874 
December 31, 2022
(1)(1)(1)(1)
($ in thousands)Total Fair ValueQuoted Prices in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Other real estate269 — — 269 
Loan servicing asset1,027 — 1,027 — 
Total$1,296 $— $1,027 $269 
(1) The amounts represent balances measured at fair value during the period and still held as of the reporting date.
Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets
Following is a summary of the carrying amounts and fair values of the Company’s financial instruments on the consolidated balance sheets at December 31, 2023 and 2022. This summary excludes certain financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis disclosed above. Financial instruments for which carrying values approximate fair value include cash and due from banks, federal funds sold, interest bearing deposits, accrued interest receivable/payable, demand, savings and money market deposits.
 December 31, 2023December 31, 2022
($ in thousands)Carrying AmountEstimated fair valueLevelCarrying AmountEstimated fair valueLevel
Balance sheet assets    
Securities held-to-maturity$750,434 $696,647 Level 2$709,915 $628,517 Level 2
Other investments63,255 63,255 Level 261,123 61,123 Level 2
Loans held-for-sale359 359 Level 21,228 1,228 Level 2
Loans, net10,749,347 10,392,551 Level 39,600,206 9,328,844 Level 3
State tax credits, held-for-sale22,115 23,897 Level 327,700 28,880 Level 3
Servicing asset2,861 3,799 Level 23,648 3,905 Level 2
Balance sheet liabilities    
Certificates of deposit$1,272,914 $1,265,905 Level 3$530,708 $512,229 Level 3
Subordinated debentures and notes155,984 154,354 Level 2155,433 152,679 Level 2
FHLB advances— — Level 2100,000 100,004 Level 2
Other borrowings297,829 274,658 Level 2324,119 324,119 Level 2