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Borrowings and Related Interest (Advances from the Federal Home Loan Bank) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 549,046 $ 570,425
Federal Home Loan Bank Advances [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings 80,919 77,444
Federal Home Loan Bank Advances [Member] | Under 90 Days [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings 33,175  
Federal Home Loan Bank Advances [Member] | Over One to Three Years [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings 8,780  
Federal Home Loan Bank Advances [Member] | Over Three to Five Years [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings 34,514  
Federal Home Loan Bank Advances [Member] | Over FIve Years [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings 4,450  
Federal Loan Home Bank Advances Short Term Period Matured [Member] | Federal Home Loan Bank Advances [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 33,175 $ 33,572
FHLB, Weighted Average Interest Rate 2.67% 2.61%
Federal Loan Home Bank Advances Long Term Period Matured [Member] | Federal Home Loan Bank Advances [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 47,744 $ 43,872
FHLB, Weighted Average Interest Rate 2.90% 2.89%