Consolidated Statements of Financial Condition	Dec. 31, 2015 USD ($)
Statement Of Financial Position [Abstract]
Cash and due from banks	$ 12,415,000
Interest-bearing deposits in banks	18,580,000
Federal funds sold	7,000
Cash and cash equivalents	31,002,000
Certificates of deposit in banks	6,070,000
Securities available-for-sale	144,721,000
Loans held for sale	2,771,000
Loans, net of unearned income	479,271,000
Less allowance for loan losses	(3,827,000)
Net loans	475,444,000
Premises and equipment, net	20,553,000
Accrued interest receivable	2,234,000
Bank owned life insurance	14,731,000
Foreclosed assets	1,949,000
Deferred income taxes	2,445,000
Core deposit intangible	2,763,000
Goodwill	9,410,000
Other assets	3,941,000
Total assets	718,034,000
Liabilities and Stockholders' Equity
Noninterest-bearing deposits	124,345,000
Interest-bearing deposits	486,054,000
Total deposits	610,399,000
Securities sold under agreements to repurchase	10,166,000
Federal Home Loan Bank advances	10,500,000
Payable to Keystone shareholders	7,274,000
Accrued interest payable and other liabilities	4,771,000
Total liabilities	643,110,000
Commitments
Stockholders' Equity
Common stock ($1 par value; 10,000,000 shares authorized; 5,090,901 and 4,876,104 shares issued; 5,080,857 and 4,809,594 shares outstanding, respectively)	4,876,000
Additional paid in capital	62,493,000
Retained earnings	7,941,000
Accumulated other comprehensive income (loss)	571,000
Treasury stock at cost (10,044 and 66,510 shares, respectively)	(957,000)
Total stockholders' equity	74,924,000
Total liabilities and stockholders' equity	$ 718,034,000