Loans and Leases - Age Analysis of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 24,641	$ 27,941
Current	4,042,545	3,977,938
Acquired Credit Impaired	693	695
Loans and leases held for investment	4,067,879	4,006,574	$ 3,689,888
Recorded Investment 90 Days or more Past Due and Accruing Interest	636	192
Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired Credit Impaired	693	695
Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	10,202	16,434
Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,994	3,227
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	12,445	8,280
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,823	3,541
Current	923,815	934,144
Loans and leases held for investment	927,638	937,685	907,938
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	0	0
Commercial, Financial and Agricultural [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,661	1,043
Commercial, Financial and Agricultural [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	210	270
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	1,952	2,228
Real Estate-Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	8,298	8,562
Current	1,790,701	1,732,436
Loans and leases held for investment	1,799,205	1,741,204
Recorded Investment 90 Days or more Past Due and Accruing Interest	0	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	206
Real Estate-Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,133	5,425
Real Estate-Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	647	1,538
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	5,518	1,599
Real Estate-Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	447	2,269
Current	216,517	213,244
Loans and leases held for investment	216,964	215,513
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	341	2,163
Real Estate-Construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	106
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	106	0
Real Estate-Residential Secured for Business Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,174	4,438
Current	357,323	357,932
Loans and leases held for investment	360,922	362,796	333,361
Recorded Investment 90 Days or more Past Due and Accruing Interest	0	0
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	425	426
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	1,521	2,497
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	515	777
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	1,138	1,164
Real Estate Residential Secured For Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,157	3,920
Current	403,921	384,427
Loans and leases held for investment	409,140	388,410
Recorded Investment 90 Days or more Past Due and Accruing Interest	325	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	62	63
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	3,346	2,334
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	0	0
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	1,811	1,586
Real Estate-Home Equity Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,783	1,742
Current	179,115	184,509
Loans and leases held for investment	180,898	186,251
Recorded Investment 90 Days or more Past Due and Accruing Interest	0	0
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	304	305
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	90	96
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	1,389	1,341
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	321	291
Current	32,282	32,468
Loans and leases held for investment	32,603	32,759	28,255
Recorded Investment 90 Days or more Past Due and Accruing Interest	54	55
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	173	207
Loans to Individuals [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	94	29
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	54	55
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,638	3,178
Current	138,871	138,778
Loans and leases held for investment	140,509	141,956	$ 129,740
Recorded Investment 90 Days or more Past Due and Accruing Interest	257	137
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	723	2,460
Lease Financings [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	438	411
Lease Financings [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 477	$ 307