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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2021
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 as of December 31, 2021 and 2020, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value.
 December 31, 2021
($ 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$— $173,511 $— $173,511 
Obligations of states and political subdivisions— 575,084 — 575,084 
Residential mortgage-backed securities— 513,859 — 513,859 
Corporate debt securities— 12,382 — 12,382 
U.S. Treasury Bills— 91,170 — 91,170 
Total securities available-for-sale— 1,366,006 — 1,366,006 
Other investments— 3,012 — 3,012 
Derivative financial instruments— 12,869 — 12,869 
Total assets$— $1,381,887 $— $1,381,887 
Liabilities    
Derivative financial instruments$— $15,794 $— $15,794 
Total liabilities$— $15,794 $— $15,794 

 December 31, 2020
($ 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$— $15,161 $— $15,161 
Obligations of states and political subdivisions— 344,232 — 344,232 
Residential mortgage-backed securities— 526,572 — 526,572 
Corporate debt securities— 14,998 — 14,998 
U.S. Treasury Bills— 11,466 — 11,466 
Total securities available-for-sale— 912,429 — 912,429 
Derivative financial instruments— 28,703 — 28,703 
Total assets$— $941,132 $— $941,132 
Liabilities
Derivative financial instruments$— $34,967 $— $34,967 
Total liabilities$— $34,967 $— $34,967 
Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis
The following table presents financial instruments and non-financial assets measured at fair value on a non-recurring basis as of December 31, 2021 and 2020. 
December 31, 2021
(1)(1)(1)(1)
($ 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)		Total losses for the year ended
December 31, 2021
Impaired loans$6,406 $— $— $6,406 $3,500 
Other real estate632 — — 632 29 
Loan servicing asset3,146 $3,146 $— $156 
Total$10,184 $— $3,146 $7,038 $3,685 
December 31, 2020
(1)(1)(1)(1)
($ 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)		Total losses for the year ended
December 31, 2020
Impaired loans$1,247 $— $— $1,247 $4,486 
Other real estate3,600 — — 3,600 1,000 
Total$4,847 $— $— $4,847 $5,486 
(1) The amounts represent balances measured at fair value during the period and still held as of the reporting date.
Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets
Following is a summary of the carrying amounts and fair values of the Company’s financial instruments on the consolidated balance sheets at December 31, 2021 and 2020. This summary excludes certain financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis disclosed above. Financial instruments for which carrying values approximate fair value include cash and due from banks, federal funds sold, interest bearing deposits, accrued interest receivable/payable, demand, savings and money market deposits.
 December 31, 2021December 31, 2020
($ in thousands)Carrying AmountEstimated fair valueLevelCarrying AmountEstimated fair valueLevel
Balance sheet assets    
Securities held-to-maturity$429,681 $434,672 Level 2$487,610 $501,523 Level 2
Other investments56,884 56,884 Level 248,764 48,764 Level 2
Loans held-for-sale6,389 6,389 Level 213,564 13,564 Level 2
Loans, net8,872,601 8,869,891 Level 37,088,264 7,067,562 Level 3
State tax credits, held-for-sale27,994 30,686 Level 336,853 39,925 Level 3
Servicing asset6,714 6,714 Level 25,721 5,721 Level 2
Balance sheet liabilities    
Certificates of deposit$608,293 $606,177 Level 3$550,095 $553,946 Level 3
Subordinated debentures and notes154,899 155,972 Level 2203,637 192,889 Level 2
FHLB advances50,000 51,527 Level 250,000 51,871 Level 2
Other borrowings353,863 353,863 Level 2301,081 301,081 Level 2
Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet