Allowance for Loan and Lease Losses (Details 5)	Sep. 30, 2016 class
Commercial real estate loans
Allowance for loan losses and recorded investment in loans
Number of loan classes within specific portfolio	3
Commercial real estate
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	38.30%
Multi-family mortgage
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	13.20%
Construction loans
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	2.60%
Commercial loans
Allowance for loan losses and recorded investment in loans
Number of loan classes within specific portfolio	3
Commercial
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	12.20%
Equipment financing
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	14.40%
Condominium association
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	1.00%
Consumer loans
Allowance for loan losses and recorded investment in loans
Number of loan classes within specific portfolio	4
Minimum loan-to-value ratio needed for loans to be made	80.00%
Residential
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	11.60%
Home equity
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	6.40%
Indirect automobile loans
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	0.10%
Other consumer
Allowance for loan losses and recorded investment in loans
Percentage of loans to aggregate outstanding amount	0.20%