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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Recurring    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities $ 246,103 $ 193,609
U.S. Government agency securities 415,515 632,009
Mortgage-backed securities 1,397,678 1,920,239
State and municipal securities 1,485,387 1,823,837
Agency-backed securities 153,410 229,569
Corporate notes and other 111,245 114,931
Total investment securities available-for-sale 3,809,338 4,914,194
Other Investments 144,589 125,969
Other assets 97,153 57,441
Total assets at fair value 4,051,080 5,097,604
Liabilities at fair value: [Abstract]    
Other liabilities 56,579 80,106
Total liabilities at fair value 56,579 80,106
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 246,103 193,609
U.S. Government agency securities 415,515 632,009
Mortgage-backed securities 1,397,678 1,920,239
State and municipal securities 1,484,731 1,823,009
Agency-backed securities 153,410 229,569
Corporate notes and other 111,245 114,931
Total investment securities available-for-sale 3,808,682 4,913,366
Other Investments 22,978 24,973
Other assets 97,153 57,441
Total assets at fair value 3,928,813 4,995,780
Liabilities at fair value: [Abstract]    
Other liabilities 56,579 80,106
Total liabilities at fair value 56,579 80,106
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 656 828
Agency-backed securities 0 0
Corporate notes and other 0 0
Total investment securities available-for-sale 656 828
Other Investments 121,611 100,996
Other assets 0 0
Total assets at fair value 122,267 101,824
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 32,507 39,336
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 8,237 8,537
Collateral dependent loans (1) [1] 24,270 30,799
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 32,507 39,336
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 8,237 8,537
Collateral dependent loans (1) [1] $ 24,270 $ 30,799
[1] The carrying values of collateral dependent loans at June 30, 2022 and December 31, 2021 are net of valuation allowances of $1.5 million and $1.7 million, respectively