Acquisition of IA Bancorp, Inc. (Summary of Acquisition, Consideration Paid and Fair Value of Assets Acquired and Liabilities Assumed) (Details) $ in Thousands		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Cash paid for exchange of IAB shares	$ 2,550	$ 2,550
Total consideration paid	19,955
Cash and cash equivalents	7,597	7,597
Investment securities available for sale	13,811	13,811
Restricted investment in bank stocks	1,163	1,163
Loans	182,585	182,585
Premises and equipment, net	2,834	2,834
Other real estate owned, net	328	328
Accrued interest receivable	612	612
Core deposit intangible	430	430
Deferred tax asset	5,212	5,212
Other assets	1,273	1,273
Total assets acquired	215,845	215,845
Deposits	178,436	178,436
Borrowings	20,015	20,015
Accrued interest payable	120	120
Other liabilities	2,542	2,542
Total liabilities assumed	201,113	201,113
Net assets acquired	14,732	14,732
Goodwill recorded in acquisition	5,223	$ 5,223
Common Stock [Member]
Business Acquisition [Line Items]
Stock issued in acquisition	9,952
Preferred Stock [Member]
Business Acquisition [Line Items]
Stock issued in acquisition	$ 7,453