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Loans, Allowance for Loan Losses and Credit Quality (Impaired Loans by Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | ---
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 980 | $ 1,104
Related Allowance | 980 |
Impaired Financing Receivable, Recorded Investment, Total | 49,628 |
Impaired Financing Receivable, Unpaid Principal Balance | 68,140 |
WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 39,242 |
Unpaid Principal Balance | 56,605 |
Related Allowance | 0 |
WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 10,386 |
Unpaid Principal Balance | 11,535 |
Commercial and Industrial [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 126 | 58
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 23,786 |
Unpaid Principal Balance | 34,970 |
Related Allowance | 0 |
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 670 |
Unpaid Principal Balance | 670 |
Commercial Real Estate [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 48 | 75
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 6,213 |
Unpaid Principal Balance | 12,101 |
Related Allowance | 0 |
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 2,124 |
Unpaid Principal Balance | 2,124 |
Construction Loans [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 0
Small Business [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 8 | 1
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 469 |
Unpaid Principal Balance | 484 |
Related Allowance | 0 |
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 68 |
Unpaid Principal Balance | 105 |
Residential Real Estate [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 637 | 802
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 4,976 |
Unpaid Principal Balance | 5,123 |
Related Allowance | 0 |
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 6,252 |
Unpaid Principal Balance | 7,163 |
Consumer Home Equity [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 156 | 161
Consumer Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 3,764 |
Unpaid Principal Balance | 3,893 |
Related Allowance | 0 |
Consumer Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 1,184 |
Unpaid Principal Balance | 1,382 |
Consumer - Other [Member] |  |
Impaired loans by loan portfolio |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 5 | $ 7
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 34 |
Unpaid Principal Balance | 34 |
Related Allowance | 0 |
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member] |  |
Impaired loans by loan portfolio |  |
Recorded Investment | 88 |
Unpaid Principal Balance | $ 91 |

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