Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Cash and due from banks	$ 12,415	$ 16,171
Interest-bearing deposits in banks	18,580	6,018
Federal funds sold	7	3,180
Cash and cash equivalents	31,002	25,369
Certificates of deposit in banks	6,070	1,992
Securities available-for-sale	144,721	130,285
Loans held for sale	2,771	164
Loans, net of unearned income	479,271	265,137
Less allowance for loan losses	(3,827)	(3,778)
Net loans	475,444	261,359
Premises and equipment, net	20,553	12,699
Accrued interest receivable	2,234	1,597
Bank owned life insurance	14,731	9,666
Foreclosed assets	1,949	2,340
Deferred income taxes	2,445	120
Core deposit intangible	2,763
Goodwill	9,410
Other assets	3,941	1,113
Total assets	718,034	446,704
Noninterest-bearing deposits	124,345	88,839
Interest-bearing deposits	486,054	298,992
Total deposits	610,399	387,831
Short-term debt	10,166	8,043
Long-term debt	10,500	6,000
Payable to Keystone shareholders	7,274
Accrued interest payable and other liabilities	4,771	799
Total liabilities	$ 643,110	$ 402,673
Commitments
Common stock ($1 par value; 10,000,000 and 5,000,000 shares authorized; 4,876,104 and 3,057,612 shares issued; 4,809,594 and 2,998,837 shares outstanding, respectively)	$ 4,876	$ 3,058
Additional paid in capital	62,493	35,175
Retained earnings	7,941	5,991
Accumulated other comprehensive income	571	606
Treasury stock at cost (66,510 and 58,775 shares, respectively)	(957)	(799)
Total stockholders' equity	74,924	44,031
Total liabilities and stockholders' equity	$ 718,034	$ 446,704