Loans and Leases - Major classifications of LHFI (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) loan	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Held-for-sale, Amount	$ 205		$ 0
Number of loans | loan	5		5
Charge-offs	$ 526	$ 474	$ 1,300
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	618,784	531,147	602,009
Proceeds from sales of loans and leases	$ 387	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	1
Charge-offs	$ 20	77	84
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	266,421	237,343	261,561
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	0	0
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	88,561	61,095	83,369
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	108	107
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	115,131	92,189	108,146
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	0	0
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	27,069	16,576	23,389
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	0	40
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	56,790	49,370	56,899
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	497	283	930
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	58,733	67,267	61,838
Tax certificates
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	9	6	139
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	3,114	4,820	3,705
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	0	0	0
Major classifications of loans held for investment [Abstract]
Total LHFI, net of unearned income	$ 2,965	$ 2,487	$ 3,102