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Borrowings (Advances from the Federal Home Loan Bank) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 1,072,716 $ 1,371,534
Federal Home Loan Bank Advances [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 331,632  
FHLB, Weighted Average Interest Rate 0.92%  
Federal Home Loan Bank Advances [Member] | April 3, 2017 [Member] | Four Million [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 4,209  
FHLB, Weighted Average Interest Rate 1.24%  
Settlement Date Apr. 03, 2012  
Maturity Date Apr. 03, 2017  
Federal Home Loan Bank Advances [Member] | January 16, 2018 [Member] | Twenty Five Millions [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 25,000  
FHLB, Weighted Average Interest Rate 2.18%  
Settlement Date Jan. 16, 2013  
Maturity Date Jan. 16, 2018  
Federal Home Loan Bank Advances [Member] | January 16, 2018 [Member] | Thirty Million [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 30,000  
FHLB, Weighted Average Interest Rate 2.19%  
Settlement Date Jan. 16, 2013  
Maturity Date Jan. 16, 2018  
Federal Home Loan Bank Advances [Member] | July 20, 2020 [Member] | Ten Million [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 9,785  
FHLB, Weighted Average Interest Rate 2.59%  
Settlement Date Jul. 19, 2013  
Maturity Date Jul. 20, 2020  
Federal Loan Home Bank Advances Short Term Period Matured [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 262,638  
Federal Loan Home Bank Advances Short Term Period Matured [Member] | April 4, 2016 [Member] | Twenty Five Millions [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 25,000  
FHLB, Weighted Average Interest Rate 0.59%  
Settlement Date Mar. 04, 2016  
Maturity Date Apr. 04, 2016  
Federal Loan Home Bank Advances Short Term Period Matured [Member] | April 11, 2016 [Member] | Fifty Millions [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 50,000  
FHLB, Weighted Average Interest Rate 0.60%  
Settlement Date Mar. 10, 2016  
Maturity Date Apr. 11, 2016  
Federal Loan Home Bank Advances Short Term Period Matured [Member] | April 18, 2016 [Member] | One Hundred Millions [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 100,000  
FHLB, Weighted Average Interest Rate 0.58%  
Settlement Date Mar. 16, 2016  
Maturity Date Apr. 18, 2016  
Federal Loan Home Bank Advances Short Term Period Matured [Member] | April 25, 2016 [Member] | Twenty Five Millions [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 25,000  
FHLB, Weighted Average Interest Rate 0.58%  
Settlement Date Mar. 24, 2016  
Maturity Date Apr. 25, 2016  
Federal Loan Home Bank Advances Short Term Period Matured [Member] | April 29, 2016 [Member] | Twenty Five Millions [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 25,000  
FHLB, Weighted Average Interest Rate 0.52%  
Settlement Date Mar. 30, 2016  
Maturity Date Apr. 29, 2016  
Federal Loan Home Bank Advances Short Term Period Matured [Member] | April 4, 2016 (2) [Member] | Fourty Million [Member]    
Advances From Federal Home Loan Banks [Line Items]    
Borrowings $ 37,638  
FHLB, Weighted Average Interest Rate 0.60%  
Settlement Date Mar. 01, 2016  
Maturity Date Apr. 01, 2016