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Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Securities have been in a continuous unrealized loss position, number of positions 32 62
Securities have been in a continuous unrealized loss position, fair value $ 238,435,000 $ 441,043,000
Securities have been in a continuous unrealized loss position, unrealized losses 9,941,000 10,101,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 26,453,000 146,957,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 253,000 1,363,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 211,982,000 294,086,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 9,688,000 8,738,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 253,000 $ 1,363,000
Other Debt Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 27 29
Securities have been in a continuous unrealized loss position, fair value $ 210,623,000 $ 222,187,000
Securities have been in a continuous unrealized loss position, unrealized losses 9,849,000 8,162,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,293,000 25,451,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 183,000 108,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 203,330,000 196,736,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 9,666,000 8,054,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 183,000 $ 108,000
FNMA [Member]    
Securities have been in a continuous unrealized loss position, number of positions 1 8
Securities have been in a continuous unrealized loss position, fair value $ 8,652,000 $ 67,618,000
Securities have been in a continuous unrealized loss position, unrealized losses 22,000 426,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 0 19,073,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 0 138,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 8,652,000 48,545,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 22,000 288,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 0 $ 138,000
Collateralized Mortgage Backed Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 5 33
Securities have been in a continuous unrealized loss position, fair value $ 27,812,000 $ 218,856,000
Securities have been in a continuous unrealized loss position, unrealized losses 92,000 1,939,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 19,160,000 121,506,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 70,000 1,255,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 8,652,000 97,350,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 22,000 684,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 70,000 $ 1,255,000
Corporate Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 14 16
Securities have been in a continuous unrealized loss position, fair value $ 113,324,000 $ 123,050,000
Securities have been in a continuous unrealized loss position, unrealized losses 6,676,000 6,950,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 0 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 0 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 113,324,000 123,050,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 6,676,000 6,950,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 0 $ 0
Collateralized Loan Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 13 13
Securities have been in a continuous unrealized loss position, fair value $ 97,299,000 $ 99,137,000
Securities have been in a continuous unrealized loss position, unrealized losses 3,173,000 1,212,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 7,293,000 25,451,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 183,000 108,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 90,006,000 73,686,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 2,990,000 1,104,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 183,000 $ 108,000
REMIC and CMO [Member]    
Securities have been in a continuous unrealized loss position, number of positions 2 23
Securities have been in a continuous unrealized loss position, fair value $ 5,663,000 $ 120,989,000
Securities have been in a continuous unrealized loss position, unrealized losses 39,000 1,440,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 5,663,000 102,384,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 39,000 1,117,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 18,605,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 0 323,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 39,000 $ 1,117,000
FHLMC [Member]    
Securities have been in a continuous unrealized loss position, number of positions 1 1
Securities have been in a continuous unrealized loss position, fair value $ 13,449,000 $ 30,200,000
Securities have been in a continuous unrealized loss position, unrealized losses 31,000 73,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 13,449,000 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 31,000 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 30,200,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 0 73,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 31,000 $ 0
GNMA [Member]    
Securities have been in a continuous unrealized loss position, number of positions 1 1
Securities have been in a continuous unrealized loss position, fair value $ 48,000 $ 49,000
Securities have been in a continuous unrealized loss position, unrealized losses   0
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 48,000 49,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 0 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses 0 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 0 $ 0
Maximum [Member] | GNMA [Member]    
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,000  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses $ 1,000