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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020 and 2019, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value.
 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 $— $34,967 
 December 31, 2019
($ 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$— $10,046 $— $10,046 
Obligations of states and political subdivisions— 213,024 — 213,024 
Residential mortgage-backed securities— 902,021 — 902,021 
U.S. Treasury Bills— 10,226 — 10,226 
Total securities available-for-sale— 1,135,317 — 1,135,317 
Other investments— — — — 
Derivative financial instruments— 11,055 — 11,055 
Total assets$— $1,146,372 $— $1,146,372 
Liabilities
Derivative financial instruments$— $14,747 $— $14,747 
Total liabilities$— $14,747 $— $14,747 
Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis
The following table presents financial instruments and non-financial assets measured at fair value on a non-recurring basis as of December 31, 2020 and 2019. 
December 31, 2020
(1)(1)(1)(1)
($ 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 $5,486 
December 31, 2019
(1)(1)(1)(1)
($ 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, 2019
Impaired loans$2,506 $— $— $2,506 $2,687 
Total$7,450 $— $— $7,450 $2,687 
(1) The amounts represent balances measured at fair value during the period and still held as of the reporting date.
Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets
Following is a summary of the carrying amounts and fair values of the Company’s financial instruments on the consolidated balance sheets at December 31, 2020 and 2019. This summary excludes certain financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis disclosed above. Financial instruments for which carrying values approximate fair value include cash and due from banks, federal funds sold, interest bearing deposits, accrued interest receivable/payable, demand, savings and money market deposits.
 December 31, 2020December 31, 2019
($ in thousands)Carrying AmountEstimated fair valueLevelCarrying AmountEstimated fair valueLevel
Balance sheet assets    
Securities held-to-maturity$487,610 $501,523 Level 2$181,166 $181,939 Level 2
Other investments48,764 48,764 Level 238,044 38,044 Level 2
Loans held-for-sale13,564 13,564 Level 25,570 5,570 Level 2
Loans, net7,088,264 7,067,562 Level 35,271,049 5,205,651 Level 3
State tax credits, held-for-sale36,853 39,925 Level 336,802 39,046 Level 3
Balance sheet liabilities    
Certificates of deposit$550,095 $553,946 Level 3$826,447 $825,203 Level 3
Subordinated debentures and notes203,637 192,889 Level 2141,258 130,985 Level 2
FHLB advances50,000 51,871 Level 2222,406 221,402 Level 2
Other borrowings301,081 301,081 Level 2265,172 265,172 Level 2
Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet