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Investment Securities - Realized Gains and Losses and Proceeds from Sales (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Realized gains and losses and the proceeds from sales of securities          
Proceeds from sales       $ 4,692,000 $ 3,527,000
Available-for-sale mortgage-backed securities sold       3,400,000 779,000
Transfer of securities from held-to-maturity to available-for-sale $ 11,400,000       11,390,000
Trust preferred securities          
Realized gains and losses and the proceeds from sales of securities          
Proceeds from sales         75,000
Gross gains         2,700,000
Mortgage-backed securities          
Realized gains and losses and the proceeds from sales of securities          
Proceeds from sales         746,000
Gross gains       307,000 40,000
Debt Securities, Available-for-sale, Realized Gain       290,000 30,000
Mortgage-backed securities          
Realized gains and losses and the proceeds from sales of securities          
Proceeds from sales       $ 4,400,000  
Minimum | Mortgage-backed securities          
Realized gains and losses and the proceeds from sales of securities          
Portion of outstanding purchased principal already collected       85.00%  
Held-to-maturity debt securities          
Realized gains and losses and the proceeds from sales of securities          
Proceeds from sales   $ 5,710,000 $ 1,595,000 $ 8,360,000 4,336,000
Gross gains   $ 419,000 $ 70,000 $ 597,000 $ 2,787,000