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Acquisition of IA Bancorp, Inc. (Schedule of Combined Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 2 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]          
Interest income   $ 25,696 $ 19,069 $ 46,638 $ 37,524
Interest Expense   5,706 4,006 10,208 7,856
Provision for loan losses   2,060 776 3,402 1,274
Non-interest income   1,563 2,022 4,949 4,335
Non-interest expense   15,980 12,148 27,991 23,710
Income taxes   1,200 1,648 3,041 3,593
Net Income   $ 2,313 $ 2,513 $ 6,945 $ 5,426
Earnings per diluted share   $ 0.13 $ 0.21 $ 0.42 $ 0.45
Interest income       $ 49,740 $ 42,821
Interest Expense       10,942 9,109
Provision for loan losses       3,402 1,274
Non-interest income       5,089 4,574
Non-interest expense       29,948 27,052
Income Taxes       3,208 3,969
Net Income       $ 7,329 $ 5,991
Earnings per diluted share       $ 0.45 $ 0.50
IA Bancorp [Member]          
Business Acquisition [Line Items]          
Interest income $ 2,195        
Interest Expense 519        
Non-interest income 99        
Non-interest expense 1,385        
Income taxes 118        
Net Income $ 272        
Earnings per diluted share $ 0.01