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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Recurring    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities $ 208,613 $ 194,184
U.S. Government agency securities 282,054 396,157
Mortgage-backed securities 949,374 971,576
State and municipal securities 1,546,640 1,412,306
Agency-backed securities 161,861 117,403
Corporate notes and other 442,738 467,244
Total investment securities available-for-sale 3,591,280 3,558,870
Other Investments 173,781 153,011
Other assets 227,850 190,629
Total assets at fair value 3,992,911 3,902,510
Liabilities at fair value: [Abstract]    
Other liabilities 110,242 96,483
Total liabilities at fair value 110,242 96,483
Recurring | Quoted market prices in an active market (Level 1)    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities 0 0
U.S. Government agency securities 0 0
Mortgage-backed securities 0 0
State and municipal securities 0 0
Agency-backed securities 0 0
Corporate notes and other 0 0
Total investment securities available-for-sale 0 0
Other Investments 0 0
Other assets 0 0
Total assets at fair value 0 0
Liabilities at fair value: [Abstract]    
Other liabilities 0 0
Total liabilities at fair value 0 0
Recurring | Models with significant observable market parameters (Level 2)    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities 208,613 194,184
U.S. Government agency securities 282,054 396,157
Mortgage-backed securities 949,374 971,576
State and municipal securities 1,546,161 1,411,677
Agency-backed securities 161,861 117,403
Corporate notes and other 442,738 467,244
Total investment securities available-for-sale 3,590,801 3,558,241
Other Investments 22,019 22,029
Other assets 227,850 190,629
Total assets at fair value 3,840,670 3,770,899
Liabilities at fair value: [Abstract]    
Other liabilities 110,242 96,483
Total liabilities at fair value 110,242 96,483
Recurring | Models with significant unobservable market parameters (Level 3)    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities 0 0
U.S. Government agency securities 0 0
Mortgage-backed securities 0 0
State and municipal securities 479 629
Agency-backed securities 0 0
Corporate notes and other 0 0
Total investment securities available-for-sale 479 629
Other Investments 151,762 130,982
Other assets 0 0
Total assets at fair value 152,241 131,611
Liabilities at fair value: [Abstract]    
Other liabilities 0 0
Total liabilities at fair value 0 0
Nonrecurring    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 42,796 41,719
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 2,555 7,952
Collateral dependent loans (1) [1] 40,241 33,767
Nonrecurring | Quoted market prices in an active market (Level 1)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 0 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 0 0
Collateral dependent loans (1) [1] 0 0
Nonrecurring | Models with significant observable market parameters (Level 2)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 0 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 0 0
Collateral dependent loans (1) [1] 0 0
Nonrecurring | Models with significant unobservable market parameters (Level 3)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 42,796 41,719
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 2,555 7,952
Collateral dependent loans (1) [1] $ 40,241 $ 33,767
[1] The carrying values of collateral dependent loans at June 30, 2023 and December 31, 2022 are net of valuation allowances of $6.2 million and $6.5 million, respectively.