Loans and Leases - Major classifications of LHFI (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Held-for-sale, Amount	$ 0		$ 0		$ 0
Number of loans | loan	5		5		5
Charge-offs	$ 366	$ 229	$ 892	$ 703	$ 1,300
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	605,693	547,087	605,693	547,087	602,009
Proceeds from sales of loans and leases			5,153	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	59	0	79	77	84
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	258,662	239,776	258,662	239,776	261,561
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	0	0	0	0
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	84,910	65,385	84,910	65,385	83,369
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	0	0	108	107
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	116,200	97,270	116,200	97,270	108,146
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	0	0	0	0
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	29,030	21,010	29,030	21,010	23,389
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	7	40	8	40	40
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	56,363	50,104	56,363	50,104	56,899
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	300	164	797	447	930
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	56,258	66,898	56,258	66,898	61,838
Tax certificates
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	25	8	31	139
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	1,378	4,390	1,378	4,390	3,705
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	0	0	0	0
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	$ 2,892	$ 2,254	$ 2,892	$ 2,254	$ 3,102