Loans and Leases - Age Analysis of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 45,501	$ 17,406
Current	4,880,167	4,330,588
Accruing loans and leases	4,925,668	4,347,994
Total nonaccrual loans and lease	26,141	38,578
Loans and leases held for investment	4,951,809	4,386,836	$ 4,167,904
Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		264
Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	33,762	13,293
Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	10,546	3,970
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,193	143
Commercial Financial And Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	10,760	2,772
Current	807,765	940,815
Accruing loans and leases	818,525	943,587
Total nonaccrual loans and lease	4,208	3,442
Loans and leases held for investment	822,733	947,029	937,149
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
Commercial Financial And Agricultural [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	9,995	2,602
Commercial Financial And Agricultural [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	456	150
Commercial Financial And Agricultural [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	309	20
Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0
Current	498,978
Accruing loans and leases	498,978
Total nonaccrual loans and lease	0
Loans and leases held for investment	498,978	0
Paycheck Protection Program Loans | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0
Paycheck Protection Program Loans | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0
Paycheck Protection Program Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0
Real-Estate Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	14,592	3,739
Current	2,190,330	2,008,568
Accruing loans and leases	2,204,922	2,012,307
Total nonaccrual loans and lease	17,568	27,928
Loans and leases held for investment	2,222,490	2,040,441
Real-Estate Commercial [Member] | Valley Green Bank and Fox Chase Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired credit impaired		206
Real-Estate Commercial [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	8,006	3,473
Real-Estate Commercial [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	6,532	266
Real-Estate Commercial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	54	0
Real-Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	10,475	0
Current	202,059	232,338
Accruing loans and leases	212,534	232,338
Total nonaccrual loans and lease	0	257
Loans and leases held for investment	212,534	232,595
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] | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	9,272	0
Real-Estate Construction [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,203	0
Real-Estate Construction [Member] | Financial Asset, Equal to or 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	3,392	4,520
Current	370,904	366,473
Accruing loans and leases	374,296	370,993
Total nonaccrual loans and lease	1,754	2,980
Loans and leases held for investment	376,050	373,973	365,640
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		0
Real Estate Residential Secured For Business Purpose [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,633	2,078
Real Estate Residential Secured For Business Purpose [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,291	2,442
Real Estate Residential Secured For Business Purpose [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	468	0
Real Estate-Residential Secured For Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	3,377	3,415
Current	457,867	433,548
Accruing loans and leases	461,244	436,963
Total nonaccrual loans and lease	1,268	2,038
Loans and leases held for investment	462,512	439,059
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		58
Real Estate-Residential Secured For Personal Purpose [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	3,203	2,969
Real Estate-Residential Secured For Personal Purpose [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	174	446
Real Estate-Residential Secured For Personal Purpose [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Real Estate Home Equity Secured For Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,314	902
Current	170,750	172,106
Accruing loans and leases	172,064	173,008
Total nonaccrual loans and lease	977	1,427
Loans and leases held for investment	173,041	174,435
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] | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	921	605
Real Estate Home Equity Secured For Personal Purpose [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	393	297
Real Estate Home Equity Secured For Personal Purpose [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	312	304
Current	28,910	29,579
Accruing loans and leases	29,222	29,883
Total nonaccrual loans and lease	0	0
Loans and leases held for investment	29,222	29,883	32,485
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] | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	92	157
Loans to Individuals [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	127	73
Loans to Individuals [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	93	74
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,279	1,754
Current	152,604	147,161
Accruing loans and leases	153,883	148,915
Total nonaccrual loans and lease	366	506
Loans and leases held for investment	154,249	149,421	$ 142,287
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] | Financial Asset, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	640	1,409
Lease Financings [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	370	296
Lease Financings [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 269	$ 49