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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Security
Dec. 31, 2017
USD ($)
Security
Statement [Line Items]    
Estimated Fair Value, Less Than 12 Months $ 20,601  
Unrealized Losses, Less Than 12 Months (93)  
Estimated Fair Value, 12 Months or Longer 0  
Unrealized Losses, 12 Months or Longer 0  
Estimated Fair Value, Total 20,601  
Unrealized Losses, Total $ 93  
U.S. Government sponsored agency securities    
Statement [Line Items]    
Number of Securities, Less Than 12 Months | Security 1 2
Estimated Fair Value, Less Than 12 Months $ 4,961  
Unrealized Losses, Less Than 12 Months $ (31)  
Number of Securities, 12 Months or Longer | Security 1 0
Estimated Fair Value, 12 Months or Longer $ 5,770  
Unrealized Losses, 12 Months or Longer (108)  
Estimated Fair Value, Total 10,731  
Unrealized Losses, Total $ (139)  
Estimated Fair Value, Less Than 12 Months   $ 5,830
Unrealized Losses, Less than 12 Months   (26)
Estimated Fair Value, 12 Months or Longer   0
Unrealized Losses, 12 Months or Longer   0
Estimated Fair Value, Total   5,830
Unrealized Losses, Total   $ (26)
State and municipal securities    
Statement [Line Items]    
Number of Securities, Less Than 12 Months | Security 33 4
Estimated Fair Value, Less Than 12 Months $ 72,950  
Unrealized Losses, Less Than 12 Months $ (1,292)  
Number of Securities, 12 Months or Longer | Security 38 48
Estimated Fair Value, 12 Months or Longer $ 83,770  
Unrealized Losses, 12 Months or Longer (4,174)  
Estimated Fair Value, Total 156,720  
Unrealized Losses, Total $ (5,466)  
Number of Securities, Less Than 12 Months | Security 6  
Estimated Fair Value, Less Than 12 Months $ 20,601  
Unrealized Losses, Less Than 12 Months $ (93)  
Number of Securities, 12 Months or Longer | Security 0  
Estimated Fair Value, 12 Months or Longer $ 0  
Unrealized Losses, 12 Months or Longer 0  
Estimated Fair Value, Total 20,601  
Unrealized Losses, Total $ 93  
Estimated Fair Value, Less Than 12 Months   $ 11,650
Unrealized Losses, Less than 12 Months   (50)
Estimated Fair Value, 12 Months or Longer   118,297
Unrealized Losses, 12 Months or Longer   (2,499)
Estimated Fair Value, Total   129,947
Unrealized Losses, Total   $ (2,549)
Corporate debt securities    
Statement [Line Items]    
Number of Securities, Less Than 12 Months | Security 8 1
Estimated Fair Value, Less Than 12 Months $ 24,419  
Unrealized Losses, Less Than 12 Months $ (227)  
Number of Securities, 12 Months or Longer | Security 14 19
Estimated Fair Value, 12 Months or Longer $ 25,642  
Unrealized Losses, 12 Months or Longer (3,126)  
Estimated Fair Value, Total 50,061  
Unrealized Losses, Total $ (3,353)  
Estimated Fair Value, Less Than 12 Months   $ 4,544
Unrealized Losses, Less than 12 Months   (48)
Estimated Fair Value, 12 Months or Longer   32,163
Unrealized Losses, 12 Months or Longer   (1,828)
Estimated Fair Value, Total   36,707
Unrealized Losses, Total   $ (1,876)
Collateralized mortgage obligations    
Statement [Line Items]    
Number of Securities, Less Than 12 Months | Security 39 60
Estimated Fair Value, Less Than 12 Months $ 136,563  
Unrealized Losses, Less Than 12 Months $ (1,050)  
Number of Securities, 12 Months or Longer | Security 89 57
Estimated Fair Value, 12 Months or Longer $ 388,173  
Unrealized Losses, 12 Months or Longer (10,922)  
Estimated Fair Value, Total 524,736  
Unrealized Losses, Total $ (11,972)  
Estimated Fair Value, Less Than 12 Months   $ 303,932
Unrealized Losses, Less than 12 Months   (2,408)
Estimated Fair Value, 12 Months or Longer   187,690
Unrealized Losses, 12 Months or Longer   (7,387)
Estimated Fair Value, Total   491,622
Unrealized Losses, Total   $ (9,795)
Residential mortgage-backed securities    
Statement [Line Items]    
Number of Securities, Less Than 12 Months | Security 17 116
Estimated Fair Value, Less Than 12 Months $ 18,220  
Unrealized Losses, Less Than 12 Months $ (222)  
Number of Securities, 12 Months or Longer | Security 110 89
Estimated Fair Value, 12 Months or Longer $ 402,779  
Unrealized Losses, 12 Months or Longer (14,990)  
Estimated Fair Value, Total 420,999  
Unrealized Losses, Total $ (15,212)  
Estimated Fair Value, Less Than 12 Months   $ 511,378
Unrealized Losses, Less than 12 Months   (4,348)
Estimated Fair Value, 12 Months or Longer   500,375
Unrealized Losses, 12 Months or Longer   (10,893)
Estimated Fair Value, Total   1,011,753
Unrealized Losses, Total   $ (15,241)
Commercial mortgage-backed securities    
Statement [Line Items]    
Number of Securities, Less Than 12 Months | Security 1 22
Estimated Fair Value, Less Than 12 Months $ 9,778  
Unrealized Losses, Less Than 12 Months $ (35)  
Number of Securities, 12 Months or Longer | Security 25 3
Estimated Fair Value, 12 Months or Longer $ 197,326  
Unrealized Losses, 12 Months or Longer (3,038)  
Estimated Fair Value, Total 207,104  
Unrealized Losses, Total $ (3,073)  
Estimated Fair Value, Less Than 12 Months   $ 190,985
Unrealized Losses, Less than 12 Months   (2,118)
Estimated Fair Value, 12 Months or Longer   21,770
Unrealized Losses, 12 Months or Longer   (478)
Estimated Fair Value, Total   212,755
Unrealized Losses, Total   $ (2,596)
Auction rate securities    
Statement [Line Items]    
Number of Securities, Less Than 12 Months | Security 0 0
Estimated Fair Value, Less Than 12 Months $ 0  
Unrealized Losses, Less Than 12 Months $ 0  
Number of Securities, 12 Months or Longer | Security 177 177
Estimated Fair Value, 12 Months or Longer $ 102,994  
Unrealized Losses, 12 Months or Longer (4,416)  
Estimated Fair Value, Total 102,994  
Unrealized Losses, Total $ (4,416)  
Estimated Fair Value, Less Than 12 Months   $ 0
Unrealized Losses, Less than 12 Months   0
Estimated Fair Value, 12 Months or Longer   98,668
Unrealized Losses, 12 Months or Longer   (8,742)
Estimated Fair Value, Total   98,668
Unrealized Losses, Total   $ (8,742)
Debt securities    
Statement [Line Items]    
Number of Securities, Less Than 12 Months | Security 99 205
Estimated Fair Value, Less Than 12 Months $ 266,891  
Unrealized Losses, Less Than 12 Months $ (2,857)  
Number of Securities, 12 Months or Longer | Security 454 393
Estimated Fair Value, 12 Months or Longer $ 1,206,454  
Unrealized Losses, 12 Months or Longer (40,774)  
Estimated Fair Value, Total 1,473,345  
Unrealized Losses, Total $ (43,631)  
Estimated Fair Value, Less Than 12 Months   $ 1,028,319
Unrealized Losses, Less than 12 Months   (8,998)
Estimated Fair Value, 12 Months or Longer   958,963
Unrealized Losses, 12 Months or Longer   (31,827)
Estimated Fair Value, Total   1,987,282
Unrealized Losses, Total   $ (40,825)