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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 03, 2020
Feb. 18, 2020
Jun. 20, 2019
Debt Instrument [Line Items]                
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 0   $ 0          
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank 14,000   14,000 $ 18,000        
Long-term Debt, Excluding Unamortized Cost of Debt Extinguishment Costs 32,500   32,500 192,500        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties 100,000 $ 50,000 10,529 612 $ 197      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate           3.40% 3.01%  
Notes Payable to Banks                
Debt Instrument [Line Items]                
Long-term Debt, Excluding Unamortized Cost of Debt Extinguishment Costs 32,500   32,500 42,500       $ 50,000
Federal Home Loan Bank Advances [Member]                
Debt Instrument [Line Items]                
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt $ 1,521,000   $ 1,521,000 $ 1,566,000