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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Recurring    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities $ 81,164 $ 193,609
U.S. Government agency securities 429,948 632,009
Mortgage-backed securities 1,530,564 1,920,239
State and municipal securities 1,247,165 1,823,837
Agency-backed securities 166,379 229,569
Corporate notes and other 114,503 114,931
Total investment securities available-for-sale 3,569,723 4,914,194
Other Investments 130,500 125,969
Other assets 75,202 57,441
Total assets at fair value 3,775,425 5,097,604
Liabilities at fair value: [Abstract]    
Other liabilities 50,083 80,106
Total liabilities at fair value 50,083 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 81,164 193,609
U.S. Government agency securities 429,948 632,009
Mortgage-backed securities 1,530,564 1,920,239
State and municipal securities 1,246,503 1,823,009
Agency-backed securities 166,379 229,569
Corporate notes and other 114,503 114,931
Total investment securities available-for-sale 3,569,061 4,913,366
Other Investments 23,806 24,973
Other assets 75,202 57,441
Total assets at fair value 3,668,069 4,995,780
Liabilities at fair value: [Abstract]    
Other liabilities 50,083 80,106
Total liabilities at fair value 50,083 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 662 828
Agency-backed securities 0 0
Corporate notes and other 0 0
Total investment securities available-for-sale 662 828
Other Investments 106,694 100,996
Other assets 0 0
Total assets at fair value 107,356 101,824
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 35,580 39,336
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 8,237 8,537
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 27,343 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
Impaired Financing Receivable, with Related Allowance, Recorded Investment [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
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0
Nonrecurring | Models with significant unobservable market parameters (Level 3)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 35,580 39,336
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 8,237 8,537
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] $ 27,343 $ 30,799
[1] The carrying values of collateral dependent loans at March 31, 2022 and December 31, 2021 are net of valuation allowances of $1.6 million and $1.7 million, respectively