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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 |  |  |  |

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