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Investment Securities Available-for-sale Securities with Unrealized Losses (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
securities
Dec. 31, 2018
USD ($)
securities
Schedule of Available-for-sale Securities    
Fair value of securities in unrealized loss position less than 12 months $ 291,292,000 $ 57,735,000
Unrealized loss less than 12 months $ 2,622,000 $ 244,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities 65 67
Fair value of securities in unrealized loss more than 12 months $ 95,701,000 $ 545,678,000
Unrealized loss more than 12 months $ 1,970,000 $ 16,102,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities 45 195
Fair value of securities in unrealized loss $ 386,993,000 $ 603,413,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 4,592,000 16,346,000
Other-than-temporary impairments 0  
States and political subdivisions    
Schedule of Available-for-sale Securities    
Fair value of securities in unrealized loss position less than 12 months 6,226,000 10,173,000
Unrealized loss less than 12 months $ 74,000 $ 18,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities 2 17
Fair value of securities in unrealized loss more than 12 months $ 2,441,000 $ 19,918,000
Unrealized loss more than 12 months $ 57,000 $ 540,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities 1 20
Fair value of securities in unrealized loss $ 8,667,000 $ 30,091,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 131,000 558,000
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities    
Fair value of securities in unrealized loss position less than 12 months 284,096,000 47,562,000
Unrealized loss less than 12 months $ 2,527,000 $ 226,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities 62 50
Fair value of securities in unrealized loss more than 12 months $ 88,993,000 $ 517,335,000
Unrealized loss more than 12 months $ 1,657,000 $ 15,175,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities 39 170
Fair value of securities in unrealized loss $ 373,089,000 $ 564,897,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 4,184,000 15,401,000
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities    
Fair value of securities in unrealized loss position less than 12 months 970,000 0
Unrealized loss less than 12 months $ 21,000 $ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities 1 0
Fair value of securities in unrealized loss more than 12 months $ 2,409,000 $ 6,707,000
Unrealized loss more than 12 months $ 114,000 $ 105,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities 3 3
Fair value of securities in unrealized loss $ 3,379,000 $ 6,707,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 135,000 105,000
Bank-issued trust preferred securities    
Schedule of Available-for-sale Securities    
Fair value of securities in unrealized loss position less than 12 months 0 0
Unrealized loss less than 12 months $ 0 $ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities 0 0
Fair value of securities in unrealized loss more than 12 months $ 1,858,000 $ 1,718,000
Unrealized loss more than 12 months $ 142,000 $ 282,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities 2 2
Fair value of securities in unrealized loss $ 1,858,000 $ 1,718,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 142,000 $ 282,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 2  
Mortgage-backed securities issued by US Government sponsored agencies    
Schedule of Available-for-sale Securities    
Percentage of mortgage-backed securities in unrealized loss position for less than 12 months 99.00%  
Mortgage-backed securities privately issued    
Schedule of Available-for-sale Securities    
Percentage of mortgage-backed securities in unrealized loss position for less than 12 months 1.00%  
Number of securities at an unrealized loss position less than 12 months | securities 2  
Fair value within book value 90.00%  
Mortgage-backed securities privately issued | Fair Value Less Than 90 Percent of Book Value    
Schedule of Available-for-sale Securities    
Fair value of securities in unrealized loss more than 12 months $ 144,000  
Mortgage-backed securities in unrealized loss position for less than 12 months, aggregate book value $ 205,000