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Investments (Additional Information) (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
Schedule of Investments [Line Items]      
Net unrealized losses on available-for-sale securities, net of tax $ (17,826,000) $ (10,300,000)  
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross 4,900,000 2,800,000  
Payments to Acquire Short-term Investments $ 232,200,000 $ 170,500,000  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 302 209  
AFS and HTM securities in Continues Unrealized Loss Position $ 722,200,000 $ 741,200,000  
AFS and HTM Securities Unrealized Loss Accumulated in Investments 24,600,000 14,500,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 621,294,000 398,360,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 23,937,000 $ 11,172,000  
Unrealized Loss as a Percent of Amortized Cost 3.00% 2.00%  
Carrying Value Of Investments Sold $ 56,800,000 $ 19,500,000 $ 28,800,000
Net gain on sale of securities 275,000 855,000 51,000
Security Owned And Pledged As Collateral Amortized Cost 734,100,000 702,500,000  
Security Owned and Pledged as Collateral, Fair Value 714,400,000 691,200,000  
Marketable Securities, Unrealized Gain (Loss) 50,000    
Gain (Loss) on Sale of Other Investments, Miscellaneous 204,000    
Dividend Income, Operating 1,315,000 1,135,000 1,005,000
Other than temporary impairment losses   0  
Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]      
Schedule of Investments [Line Items]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 591,900,000 398,400,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 23,300,000 11,200,000  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Schedule of Investments [Line Items]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 364,430,000 233,971,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 13,272,000 5,078,000  
Available-for-sale Securities [Member]      
Schedule of Investments [Line Items]      
Net gain on sale of securities (663,000) $ 855,000 $ 51,000
Visa Inc. Class B Common Stock [Member]      
Schedule of Investments [Line Items]      
Gain (Loss) on Sale of Other Investments, Miscellaneous 938,000    
Investment Securities Sold, Carrying Amount 441,000    
Proceeds from Sale of Other Investments $ 1,400,000