Loans and Leases - Aging Analysis of Past Due Payments for Each Loan Portfolio Segment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	$ 609,540,000		$ 594,247,000
Total	618,784,000	$ 531,147,000	602,009,000
Interest income lost on non-accrual loans	118,000
Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Total	2,973,000		1,742,000
Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Total	934,000		978,000
Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Total	5,337,000		5,042,000
Commercial real estate
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	263,589,000		260,168,000
Total	266,421,000	237,343,000	261,561,000
Commercial real estate | Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	1,475,000		0
Commercial real estate | Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		507,000
Commercial real estate | Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	1,357,000		886,000
Construction and land development
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	88,433,000		83,225,000
Total	88,561,000	61,095,000	83,369,000
Construction and land development | Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Construction and land development | Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	128,000		144,000
Commercial and industrial
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	114,302,000		107,190,000
Total	115,131,000	92,189,000	108,146,000
Commercial and industrial | Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	255,000		416,000
Commercial and industrial | Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		367,000
Commercial and industrial | Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	574,000		173,000
Multi-family
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	27,069,000		23,389,000
Total	27,069,000	16,576,000	23,389,000
Multi-family | Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Multi-family | Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Multi-family | Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Residential real estate
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	55,369,000		55,566,000
Total	56,790,000	49,370,000	56,899,000
Residential real estate | Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	1,072,000		978,000
Residential real estate | Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Residential real estate | Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	349,000		355,000
Leases
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	56,433,000		59,809,000
Total	58,733,000	67,267,000	61,838,000
Leases | Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	171,000		348,000
Leases | Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	934,000		104,000
Leases | Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	1,195,000		1,577,000
Tax certificates
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	1,380,000		1,798,000
Total	3,114,000	4,820,000	3,705,000
Tax certificates | Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Tax certificates | Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Tax certificates | Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	1,734,000		1,907,000
Consumer
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Current	2,965,000		3,102,000
Total	2,965,000	2,487,000	3,102,000
Consumer | Financing Receivables, 30 to 59 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Consumer | Financing Receivables, 60 to 89 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	0		0
Consumer | Financing Receivables, Equal to Greater than 90 Days Past Due
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Financing Receivable, Recorded Investment, Past Due	$ 0		$ 0
Royal Bancshares
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Interest income lost on non-accrual loans		$ 158,000