Allowance for Loan and Lease Losses (Details 7)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) loan	Sep. 30, 2015 USD ($) loan	Sep. 30, 2016 USD ($) loan	Sep. 30, 2015 USD ($) loan	Dec. 31, 2015 USD ($)
Troubled debt restructurings:
On accrual	$ 16,303,000		$ 16,303,000		$ 17,953,000
On nonaccrual	15,715,000		15,715,000		4,965,000
Total troubled debt restructurings	$ 32,000,000		32,000,000		22,900,000
Increase (decrease) in troubled debt restructurings			$ 9,100,000
Recorded Investment, Number of Loans/Leases | loan	7	17	32	22
Recorded Investment, At modification	$ 1,568,000	$ 6,897,000	$ 12,027,000	$ 7,432,000
Recorded Investment, At end of period	1,568,000	6,475,000	11,789,000	7,090,000
Specific Allowance for Loan and Lease Losses	240,000	119,000	3,498,000	119,000
Nonaccrual Loans and Leases/Recorded Investment	$ 1,052,000	$ 493,000	$ 11,195,000	$ 528,000
Defaulted, number of loans/leases | loan	3	1	6	1
Defaulted, recorded investment	$ 701,000	$ 399,000	$ 1,425,000	$ 399,000
Total loans with one modification	1,568,000	3,873,000	11,561,000	4,476,000
Total loans with more than one modification	0	2,602,000	228,000	2,614,000
Financial impact of modification of performing and nonperforming loans (less than $0.1 million)	28,000	(3,000)	110,000	14,000
Commitments to lend funds to debtors owing receivables whose terms had been modified in troubled debt restructurings			0	0
Extended maturity
Troubled debt restructurings:
Total loans with one modification	528,000	1,632,000	604,000	2,137,000
Total loans with more than one modification	0	2,602,000	228,000	2,603,000
Adjusted principal
Troubled debt restructurings:
Total loans with one modification	0	0	410,000	0
Interest only
Troubled debt restructurings:
Total loans with one modification	0	1,335,000	2,346,000	1,335,000
Combination maturity, principal, interest rate
Troubled debt restructurings:
Total loans with one modification	1,040,000	906,000	8,201,000	1,004,000
Total loans with more than one modification	$ 0	$ 0	$ 0	$ 11,000
Originated
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan	3	14	27	16
Recorded Investment, At modification	$ 1,245,000	$ 6,343,000	$ 11,653,000	$ 6,590,000
Recorded Investment, At end of period	1,245,000	5,929,000	11,417,000	6,259,000
Specific Allowance for Loan and Lease Losses	220,000	119,000	3,478,000	119,000
Nonaccrual Loans and Leases/Recorded Investment	$ 906,000	$ 493,000	$ 11,049,000	$ 493,000
Defaulted, number of loans/leases | loan	3	0	4	0
Defaulted, recorded investment	$ 701,000	$ 0	$ 729,000	$ 0
Acquired
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan	4	3	5	6
Recorded Investment, At modification	$ 323,000	$ 554,000	$ 374,000	$ 842,000
Recorded Investment, At end of period	323,000	546,000	372,000	831,000
Specific Allowance for Loan and Lease Losses	20,000	0	20,000	0
Nonaccrual Loans and Leases/Recorded Investment	$ 146,000	$ 0	$ 146,000	$ 35,000
Defaulted, number of loans/leases | loan	0	1	2	1
Defaulted, recorded investment	$ 0	$ 399,000	$ 696,000	$ 399,000
Commercial | Originated
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan	2	7	22	8
Recorded Investment, At modification	$ 812,000	$ 5,600,000	$ 9,701,000	$ 5,735,000
Recorded Investment, At end of period	812,000	5,197,000	9,504,000	5,429,000
Specific Allowance for Loan and Lease Losses	220,000	119,000	3,478,000	119,000
Nonaccrual Loans and Leases/Recorded Investment	$ 473,000	$ 239,000	$ 9,136,000	$ 239,000
Defaulted, number of loans/leases | loan	1	0	2	0
Defaulted, recorded investment	$ 348,000	$ 0	$ 376,000	$ 0
Commercial | Acquired
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan		2	0	4
Recorded Investment, At modification		$ 379,000	$ 0	$ 642,000
Recorded Investment, At end of period		372,000	0	634,000
Specific Allowance for Loan and Lease Losses		0	0	0
Nonaccrual Loans and Leases/Recorded Investment		$ 0	$ 0	$ 12,000
Defaulted, number of loans/leases | loan		1	2	1
Defaulted, recorded investment		$ 399,000	$ 696,000	$ 399,000
Equipment financing | Originated
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan	1	4	3	5
Recorded Investment, At modification	$ 433,000	$ 318,000	$ 797,000	$ 430,000
Recorded Investment, At end of period	433,000	305,000	786,000	403,000
Specific Allowance for Loan and Lease Losses	0	0	0	0
Nonaccrual Loans and Leases/Recorded Investment	$ 433,000	$ 0	$ 786,000	$ 0
Defaulted, number of loans/leases | loan	2	0	2	0
Defaulted, recorded investment	$ 353,000	$ 0	$ 353,000	$ 0
Residential mortgage | Originated
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan		1		1
Recorded Investment, At modification		$ 152,000		$ 152,000
Recorded Investment, At end of period		153,000		153,000
Specific Allowance for Loan and Lease Losses		0		0
Nonaccrual Loans and Leases/Recorded Investment		$ 153,000		$ 153,000
Defaulted, number of loans/leases | loan		0		0
Defaulted, recorded investment		$ 0		$ 0
Residential mortgage | Acquired
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan	4	1
Recorded Investment, At modification	$ 323,000	$ 175,000
Recorded Investment, At end of period	323,000	174,000
Specific Allowance for Loan and Lease Losses	20,000
Nonaccrual Loans and Leases/Recorded Investment	$ 146,000	$ 0
Defaulted, number of loans/leases | loan	0	0
Defaulted, recorded investment	$ 0	$ 0
Home equity | Originated
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan		2		2
Recorded Investment, At modification		$ 273,000		$ 273,000
Recorded Investment, At end of period		274,000		274,000
Nonaccrual Loans and Leases/Recorded Investment		$ 101,000		$ 101,000
Home equity | Acquired
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan			5	2
Recorded Investment, At modification			$ 374,000	$ 200,000
Recorded Investment, At end of period			372,000	197,000
Specific Allowance for Loan and Lease Losses			20,000	0
Nonaccrual Loans and Leases/Recorded Investment			$ 146,000	$ 23,000
Defaulted, number of loans/leases | loan			0	0
Defaulted, recorded investment			$ 0	$ 0
Commercial real estate | Originated
Troubled debt restructurings:
Recorded Investment, Number of Loans/Leases | loan			2
Recorded Investment, At modification			$ 1,155,000
Recorded Investment, At end of period			1,127,000
Specific Allowance for Loan and Lease Losses			0
Nonaccrual Loans and Leases/Recorded Investment			$ 1,127,000
Defaulted, number of loans/leases | loan			0
Defaulted, recorded investment			$ 0
Taxi Medallion Portfolio
Troubled debt restructurings:
Total troubled debt restructurings	$ 10,100,000		10,100,000		$ 1,300,000
Increase (decrease) in troubled debt restructurings			$ 8,800,000