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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]      
Valuation allowance $ 2,804   $ 2,317
Recurring      
Assets, Fair Value Disclosure [Abstract]      
U.S. treasury securities 30,946   30,445
U.S. government agency securities 173,443   180,801
Mortgage-backed securities 1,277,273   1,263,819
State and municipal securities 1,192,465   784,612
Agency-backed securities 204,672   173,292
Corporate notes and other 81,825   82,314
Total investment securities available-for-sale 2,960,624   2,515,283
Other investments 29,788   28,874
Other assets 18,319   11,812
Total assets at fair value 3,008,731   2,555,969
Liabilities at fair value: [Abstract]      
Other liabilities 20,074   13,886
Total liabilities at fair value 20,074   13,886
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 30,946   30,445
U.S. government agency securities 173,443   180,801
Mortgage-backed securities 1,277,273   1,263,819
State and municipal securities 1,177,239   767,583
Agency-backed securities 204,672   173,292
Corporate notes and other 81,825   82,314
Total investment securities available-for-sale 2,945,398   2,498,254
Other investments 0   0
Other assets 18,319   11,812
Total assets at fair value 2,963,717   2,510,066
Liabilities at fair value: [Abstract]      
Other liabilities 20,074   13,886
Total liabilities at fair value 20,074   13,886
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 15,226   17,029
Agency-backed securities 0   0
Corporate notes and other 0   0
Total investment securities available-for-sale 15,226   17,029
Other investments 29,788   28,874
Other assets 0   0
Total assets at fair value 45,014   45,903
Liabilities at fair value: [Abstract]      
Other liabilities 0   0
Total liabilities at fair value 0   0
Nonrecurring      
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]      
Other real estate owned 23,982   27,831
Nonaccrual loans, net [1] 105,533   99,317
Total 129,515   127,148
Total losses on other real estate owned 481 $ 203  
Total losses on collateral dependent nonaccrual loans, net [1] (2,801) (722)  
Total gains (losses) for the year-to-date period then ended (2,320) $ (519)  
Nonrecurring | Quoted market prices in an active market (Level 1)      
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]      
Other real estate owned 0   0
Nonaccrual loans, net [1] 0   0
Total 0   0
Nonrecurring | Models with significant observable market parameters (Level 2)      
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]      
Other real estate owned 0   0
Nonaccrual loans, net [1] 0   0
Total 0   0
Nonrecurring | Models with significant unobservable market parameters (Level 3)      
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]      
Other real estate owned 23,982   27,831
Nonaccrual loans, net [1] 105,533   99,317
Total $ 129,515   $ 127,148
[1] Amount is net of valuation allowance of $2.8 million and $2.3 million at March 31, 2018 and December 31, 2017, respectively, as required by ASC 310-10, "Receivables."