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Borrowings (Tables)
12 Months Ended
Dec. 31, 2017
Borrowings [Abstract]  
Summary Of Outstanding Short-Term Borrowings
    2017   2016
Short-term borrowings:        
Short-term FHLB borrowings $ 446,200 $ 331,500
Long-term borrowings:        
Subordinated notes, net   39,131   39,061
Total borrowings $ 485,331 $ 370,561