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Acquisitions - Pro Forma Financial Information (Details) - Arlington Bank
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Total revenue (net interest income plus other income) | $ $ 307,246
Net income | $ $ 84,356
Basic | $ / shares $ 1.96
Diluted | $ / shares $ 1.95