Loans and Leases - Age Analysis of Past Due Loans and Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 23,165	$ 28,566
Current	3,255,369	2,149,194
Acquired credit impaired	7,352	1,253
Loans and leases held for investment	3,285,886	2,179,013
Recorded Investment 90 Days or more Past Due and Accruing Interest	987	379
Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired	7,352
Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired	990	1,253
Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	10,625	17,632
Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,804	3,524
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	7,736	7,410
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,127	5,441
Current	819,550	498,757
Loans and leases held for investment	823,266	504,515
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	589
Commercial, Financial and Agricultural [Member] | Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		317
Commercial, Financial and Agricultural [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,536	864
Commercial, Financial and Agricultural [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	256	298
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	1,335	4,279
Real Estate-Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,633	13,205
Current	1,363,606	872,174
Loans and leases held for investment	1,374,949	885,892
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	5,710
Real Estate-Commercial [Member] | Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		513
Real Estate-Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,482	12,103
Real Estate-Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,560	0
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	2,591	1,102
Real Estate-Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	202	0
Current	174,642	96,541
Loans and leases held for investment	174,844	96,541
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
Real Estate-Construction [Member] | Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		0
Real Estate-Construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	202	0
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	0
Real Estate-Residential Secured for Business Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,357	4,489
Current	289,927	213,871
Loans and leases held for investment	294,068	218,783
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	784
Real Estate-Residential Secured for Business Purpose [Member] | Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		423
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	1,390	1,406
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	428	2,356
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	1,539	727
Real Estate-Residential Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,027	1,368
Current	285,512	179,787
Loans and leases held for investment	290,808	181,155
Recorded Investment 90 Days or more Past Due and Accruing Interest	481	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	269
Real Estate-Residential Secured for Personal Purpose [Member] | Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		0
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	3,243	990
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	905	69
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	879	309
Real Estate-Home Equity Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,380	1,003
Current	161,459	135,952
Loans and leases held for investment	162,839	136,955
Recorded Investment 90 Days or more Past Due and Accruing Interest	171	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
Real Estate-Home Equity Secured for Personal Purpose [Member] | Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		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	717	777
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	142	52
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	521	174
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	561	468
Current	29,812	29,264
Loans and leases held for investment	30,373	29,732
Recorded Investment 90 Days or more Past Due and Accruing Interest	142	173
Loans to Individuals [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired	0
Loans to Individuals [Member] | Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		0
Loans to Individuals [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	324	198
Loans to Individuals [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	95	97
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	142	173
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,878	2,592
Current	130,861	122,848
Loans and leases held for investment	134,739	125,440
Recorded Investment 90 Days or more Past Due and Accruing Interest	193	206
Lease Financings [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired	0
Lease Financings [Member] | Valley Green Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		0
Lease Financings [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,731	1,294
Lease Financings [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,418	652
Lease Financings [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 729	$ 646