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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)
Jun. 30, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Security
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 115,864,000  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (2,549,000)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 177  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 100,859,000  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (6,551,000)  
Debt Securities, Available-for-sale, Unrealized Loss Position 216,723,000  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (9,100,000)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 24  
State and Municipal Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 30,378,000  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (227,000)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0  
Debt Securities, Available-for-sale, Unrealized Loss Position 30,378,000  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (227,000)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 9 44
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 136,344,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (1,024,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   136,344,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (1,024,000)
Corporate Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 85,486,000  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (2,322,000)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0  
Debt Securities, Available-for-sale, Unrealized Loss Position 85,486,000  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (2,322,000)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 15 5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 30,719,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (346,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   18,759,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (1,188,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   49,478,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (1,534,000)
Collateralized Mortgage Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security   1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions   5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 33,865,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (190,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   5,330,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (125,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   39,195,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (315,000)
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security   26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions   5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 12,247,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (40,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   127,373,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (909,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   139,620,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (949,000)
Commercial Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions   7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 121,340,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (1,777,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   121,340,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (1,777,000)
Auction Rate Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 177 177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 100,859,000  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (6,551,000)  
Debt Securities, Available-for-sale, Unrealized Loss Position 100,859,000  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (6,551,000)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   101,926,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (5,484,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   101,926,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (5,484,000)
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security   212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions   66
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 334,515,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (3,377,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   253,388,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (7,706,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   587,903,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (11,083,000)