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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]    
Other Investments $ 47,800 $ 38,200
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Valuation allowance of impaired loans 3,500 3,300
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Transfers out of Level 3 0  
Other Liabilities    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 0 0
Total realized gains included in income 0 0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0
Purchases 0 0
Issuances 0 0
Settlements 0 0
Transfers out of Level 3 0 0
Fair value, December 31 0 0
Other Assets    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 38,156 26,422
Total realized gains included in income 1,067 2,785
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0
Purchases 11,663 11,297
Issuances 0 0
Settlements (3,127) (2,348)
Transfers out of Level 3 0 0
Fair value, December 31 47,759 38,156
Available-for-sale Securities    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 15,903 14,595
Total realized gains included in income 110 116
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 627 2,710
Purchases 0 0
Issuances 0 0
Settlements (1,143) (1,518)
Transfers out of Level 3 0 0
Fair value, December 31 15,497 15,903
Fair Value, Measurements, Nonrecurring    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 56,155 61,964
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Other real estate owned 12,360 29,487
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 43,795 32,477
Fair Value, Measurements, Nonrecurring | Quoted Market Prices in an Active Market (Level 1)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 0 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Other real estate owned 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0
Fair Value, Measurements, Nonrecurring | Models with Significant Observable Market Parameters (Level 2)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 0 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Other real estate owned 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0
Fair Value, Measurements, Nonrecurring | Models with Significant Unobservable Market Parameters (Level 3)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 56,155 61,964
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]    
Other real estate owned 12,360 29,487
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 43,795 32,477
Fair Value, Measurements, Recurring    
Assets, Fair Value Disclosure [Abstract]    
U.S. treasury securities 82,209 72,867
U.S. government agency securities 76,403 79,692
Mortgage-backed securities 1,689,191 1,463,907
State and municipal securities 1,443,363 1,714,453
Asset-backed securities 177,936 152,972
Corporate notes and other 117,579 56,104
Total investment securities available-for-sale 3,586,681 3,539,995
Other Investments 73,395 63,291
Other assets 242,470 134,040
Total assets at fair value 3,902,546 3,737,326
Liabilities at fair value [Abstract]    
Other liabilities 177,025 87,613
Total liabilities at fair value 177,025 87,613
Fair Value, Measurements, 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
Asset-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
Fair Value, Measurements, Recurring | Models with Significant Observable Market Parameters (Level 2)    
Assets, Fair Value Disclosure [Abstract]    
U.S. treasury securities 82,209 72,867
U.S. government agency securities 76,403 79,692
Mortgage-backed securities 1,689,191 1,463,907
State and municipal securities 1,427,866 1,698,550
Asset-backed securities 177,936 152,972
Corporate notes and other 117,579 56,104
Total investment securities available-for-sale 3,571,184 3,524,092
Other Investments 25,636 25,135
Other assets 242,470 134,040
Total assets at fair value 3,839,290 3,683,267
Liabilities at fair value [Abstract]    
Other liabilities 177,025 87,613
Total liabilities at fair value 177,025 87,613
Fair Value, Measurements, 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 15,497 15,903
Asset-backed securities 0 0
Corporate notes and other 0 0
Total investment securities available-for-sale 15,497 15,903
Other Investments 47,759 38,156
Other assets 0 0
Total assets at fair value 63,256 54,059
Liabilities at fair value [Abstract]    
Other liabilities 0 0
Total liabilities at fair value $ 0 $ 0
[1] The carrying value of collateral dependent loans at December 31, 2020 is net of a valuation allowance of $3.5 million, and the carrying value of impaired loans at December 31, 2019 is net of a valuation allowance of $3.3 million.