Allowance for Loan Losses Schedule of Defaulted Troubled Debt Restructuring (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	6	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 499,000	$ 6,772,000
Commercial and Industrial
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	482,000	1,557,000
Commercial and Industrial | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	1,557,000
Commercial and Industrial | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	427,000	0
Commercial and Industrial | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	55,000
Commercial Real Estate
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	376,000
Commercial Real Estate | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	376,000
Commercial Real Estate | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Commercial Real Estate Construction Financing Receivable
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate Construction Financing Receivable | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate Construction Financing Receivable | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate Construction Financing Receivable | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Total commercial
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	482,000	1,933,000
Total commercial | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	1,933,000
Total commercial | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	427,000	0
Total commercial | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	55,000
Consumer Installment
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Consumer Installment | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	306	0
Home Equity Line of Credit
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Home Equity Line of Credit | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Consumer Credit Card
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	17,000	4,839,000
Consumer Credit Card | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	17,000	4,839,000
Residential Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Residential Mortgages | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Total consumer
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	4	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	17,000	4,839,000
Total consumer | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	4	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 17,000	$ 4,839,000