Loans and Leases - Age Analysis of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 29,153	$ 25,143
Current	3,836,116	3,593,341
Acquired Credit Impaired	900	1,583
Loans and leases held for investment	3,866,169	3,620,067	$ 3,487,164
Recorded Investment 90 Days or more Past Due and Accruing Interest	1,224	761
Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	900	1,583
Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	7,857	13,682
Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	12,412	4,285
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	8,884	7,176
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	10,815	5,131
Current	883,325	890,658
Loans and leases held for investment	894,322	896,211	859,217
Recorded Investment 90 Days or more Past Due and Accruing Interest	0	0
Commercial, Financial and Agricultural [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	182	422
Commercial, Financial and Agricultural [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	661	2,182
Commercial, Financial and Agricultural [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	9,151	1,440
Commercial, Financial and Agricultural [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,003	1,509
Real Estate-Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,854	2,691
Current	1,694,083	1,539,094
Loans and leases held for investment	1,697,143	1,542,141
Recorded Investment 90 Days or more Past Due and Accruing Interest	83	0
Real Estate-Commercial [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	206	356
Real Estate-Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,168	733
Real Estate-Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	373	548
Real Estate-Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,313	1,410
Real Estate-Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	2,335
Current	192,637	173,501
Loans and leases held for investment	192,637	175,836
Recorded Investment 90 Days or more Past Due and Accruing Interest	0	0
Real Estate-Construction [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	0	0
Real Estate-Construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	1,970
Real Estate-Construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Real Estate-Construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	365
Real Estate-Residential Secured for Business Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,533	3,321
Current	342,350	338,061
Loans and leases held for investment	346,331	341,967	310,020
Recorded Investment 90 Days or more Past Due and Accruing Interest	0	162
Real Estate-Residential Secured for Business Purpose [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	448	585
Real Estate-Residential Secured for Business Purpose [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,221	1,651
Real Estate-Residential Secured for Business Purpose [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	47	315
Real Estate-Residential Secured for Business Purpose [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,265	1,355
Real Estate Residential Secured For Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,803	5,509
Current	375,642	315,845
Loans and leases held for investment	380,509	321,574
Recorded Investment 90 Days or more Past Due and Accruing Interest	0	0
Real Estate Residential Secured For Personal Purpose [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	64	220
Real Estate Residential Secured For Personal Purpose [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,403	4,368
Real Estate Residential Secured For Personal Purpose [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	981	1,118
Real Estate Residential Secured For Personal Purpose [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,419	23
Real Estate-Home Equity Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,924	2,211
Current	185,057	182,059
Loans and leases held for investment	186,981	184,270
Recorded Investment 90 Days or more Past Due and Accruing Interest	128	148
Real Estate-Home Equity Secured for Personal Purpose [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	0	0
Real Estate-Home Equity Secured for Personal Purpose [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	406	1,414
Real Estate-Home Equity Secured for Personal Purpose [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	189	333
Real Estate-Home Equity Secured for Personal Purpose [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,329	464
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	298	555
Current	31,940	27,745
Loans and leases held for investment	32,238	28,300	27,441
Recorded Investment 90 Days or more Past Due and Accruing Interest	165	195
Loans to Individuals [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	0	0
Loans to Individuals [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	101	221
Loans to Individuals [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	32	139
Loans to Individuals [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	165	195
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,926	3,390
Current	131,082	126,378
Loans and leases held for investment	136,008	129,768	$ 124,138
Recorded Investment 90 Days or more Past Due and Accruing Interest	848	256
Lease Financings [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	0	0
Lease Financings [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	897	1,143
Lease Financings [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,639	392
Lease Financings [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 2,390	$ 1,855