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Investment Securities (Available-for-sale Securities with Unrealized Loss) (Details)
9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
securities
Sep. 30, 2020
Sep. 30, 2020
contract
Dec. 31, 2019
USD ($)
securities
Available-for-sale securities that had an unrealized loss:          
Less than 12 months, fair value $ 143,302,000       $ 291,292,000
Less than 12 months, unrealized loss 1,799,000       $ 2,622,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities   45     65
12 months or more, fair value 23,207,000       $ 95,701,000
12 months or more, unrealized loss 814,000       $ 1,970,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities   22     45
Total unrealized loss position, fair value 166,509,000       $ 386,993,000
Total unrealized loss 2,613,000       4,592,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 0        
Available-for-sale Securities, Amortized Cost Basis 829,899,000       929,395,000
Gross Unrealized Gains 24,417,000       11,298,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,614,000       4,592,000
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a) 851,702,000       936,101,000
Securities Investment [Member]          
Available-for-sale securities that had an unrealized loss:          
Interest Receivable 3,400,000       3,600,000
States and political subdivisions          
Available-for-sale securities that had an unrealized loss:          
Less than 12 months, fair value         6,226,000
Less than 12 months, unrealized loss         $ 74,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities         2
12 months or more, fair value         $ 2,441,000
12 months or more, unrealized loss         $ 57,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities         1
Total unrealized loss position, fair value         $ 8,667,000
Total unrealized loss         131,000
Available-for-sale Securities, Amortized Cost Basis 99,518,000       111,217,000
Gross Unrealized Gains 4,608,000       3,018,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0       131,000
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a) 104,126,000       114,104,000
Residential mortgage-backed securities          
Available-for-sale securities that had an unrealized loss:          
Less than 12 months, fair value 142,807,000       284,096,000
Less than 12 months, unrealized loss 1,794,000       $ 2,527,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities   44     62
12 months or more, fair value 19,904,000       $ 88,993,000
12 months or more, unrealized loss 519,000       $ 1,657,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities   18     39
Total unrealized loss position, fair value 162,711,000       $ 373,089,000
Total unrealized loss 2,313,000       4,184,000
Available-for-sale Securities, Amortized Cost Basis 710,254,000       787,430,000
Gross Unrealized Gains 19,052,000       7,763,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,314,000       4,184,000
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a) 726,992,000       791,009,000
Commercial mortgage-backed securities          
Available-for-sale securities that had an unrealized loss:          
Less than 12 months, fair value 0       970,000
Less than 12 months, unrealized loss 0       $ 21,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities   0     1
12 months or more, fair value 1,475,000       $ 2,409,000
12 months or more, unrealized loss 123,000       $ 114,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities   2     3
Total unrealized loss position, fair value 1,475,000       $ 3,379,000
Total unrealized loss 123,000       135,000
Available-for-sale Securities, Amortized Cost Basis 10,473,000       18,135,000
Gross Unrealized Gains 218,000       88,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 123,000       135,000
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a) 10,568,000       18,088,000
Bank-issued trust preferred securities          
Available-for-sale securities that had an unrealized loss:          
Less than 12 months, fair value 495,000       0
Less than 12 months, unrealized loss 5,000       $ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities   1     0
12 months or more, fair value 1,828,000       $ 1,858,000
12 months or more, unrealized loss 172,000       $ 142,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities   2     2
Total unrealized loss position, fair value 2,323,000       $ 1,858,000
Total unrealized loss 177,000       142,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities   2      
Available-for-sale Securities, Amortized Cost Basis 4,696,000       4,696,000
Gross Unrealized Gains 114,000       137,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 177,000       142,000
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a) 4,633,000       4,691,000
Mortgage-backed securities, issued by US government sponsored agencies          
Available-for-sale securities that had an unrealized loss:          
Percentage of mortgage-backed securities in unrealized loss position for more than 12 months     99.00%    
Mortgage-backed securities, privately issued          
Available-for-sale securities that had an unrealized loss:          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year   2   2  
Percentage of mortgage-backed securities in unrealized loss position for more than 12 months     1.00%    
Fair value within book value     90.00%    
U.S. government sponsored agencies          
Available-for-sale securities that had an unrealized loss:          
Available-for-sale Securities, Amortized Cost Basis 4,958,000       7,917,000
Gross Unrealized Gains 425,000       292,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0       0
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a) $ 5,383,000       $ 8,209,000