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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the three months ended March 31, 2020
​ |  | Unrealized Gains |  | Unrealized Gains | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | (Losses) on |  | (Losses) on | ​ | ​ | ​ |  | Fair Value | ​ | ​ | ​
​ |  | Available for Sale |  | Cash flow |  | Defined Benefit |  | Option Elected | ​ | ​ | ​
​ |  | Securities |  | Hedges |  | Pension Items |  | on Liabilities |  | Total
​ |  | (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance, net of tax | ​ | $ | (3,982) | ​ | $ | (5,863) | ​ | $ | (983) | ​ | $ | 1,021 | ​ | $ | (9,807)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income before reclassifications, net of tax | ​ |  | (10,202) | ​ |  | (13,748) | ​ |  | — | ​ |  | 1,096 | ​ |  | (22,854)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts reclassified from accumulated other comprehensive income, net of tax | ​ |  | 25 | ​ |  | 143 | ​ |  | 53 | ​ |  | — | ​ |  | 221
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net current period other comprehensive income (loss), net of tax | ​ |  | (10,177) | ​ |  | (13,605) | ​ |  | 53 | ​ |  | 1,096 | ​ |  | (22,633)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, net of tax | ​ | $ | (14,159) | ​ | $ | (19,468) | ​ | $ | (930) | ​ | $ | 2,117 | ​ | $ | (32,440)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the three months ended March 31, 2019
​ |  | Unrealized Gains |  | Unrealized Gains | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | (Losses) on |  | (Losses) on | ​ | ​ | ​ |  | Fair Value | ​ | ​ | ​
​ |  | Available for Sale |  | Cash flow |  | Defined Benefit |  | Option Elected | ​ | ​ | ​
​ |  | Securities |  | Hedges |  | Pension Items |  | on Liabilities |  | Total
​ |  | (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance, net of tax | ​ | $ | (15,649) | ​ | $ | 3,704 | ​ | $ | (1,673) | ​ | $ | 866 | ​ | $ | (12,752)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income before reclassifications, net of tax | ​ |  | 5,620 | ​ |  | (3,644) | ​ |  | — | ​ |  | 88 | ​ |  | 2,064
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | ​ |  | — | ​ |  | 139 | ​ |  | 7 | ​ |  | — | ​ |  | 146
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net current period other comprehensive income, net of tax | ​ |  | 5,620 | ​ |  | (3,505) | ​ |  | 7 | ​ |  | 88 | ​ |  | 2,210
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, net of tax | ​ | $ | (10,029) | ​ | $ | 199 | ​ | $ | (1,666) | ​ | $ | 954 | ​ | $ | (10,542)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​
For the three months ended March 31, 2020
​ |  | Amounts Reclassified from | ​ | ​
Details about Accumulated Other |  | Accumulated Other | ​ | Affected Line Item in the Statement
Comprehensive Loss Components |  | Comprehensive Loss |  | Where Net Income is Presented
(In thousands)
Unrealized gains (losses) on available for sale securities | ​ | $ | (37) | ​ | Net loss on sale of securities
​ | ​ |  | 12 | ​ | Provision for income taxes
​ | ​ | $ | (25) | ​ | Net of tax
Cash flow hedges: | ​ |  |  | ​ |
Interest rate swaps | ​ | $ | (208) | ​ | Other interest expense
​ | ​ |  | 65 | ​ | Tax benefit
​ | ​ | $ | (143) | ​ | Net of tax
Amortization of defined benefit pension items: | ​ |  |  | ​ |
Actuarial gain (losses) | ​ | $ | (97) | (1) | Other operating expense
Prior service credits | ​ |  | 20 | (1) | Other operating expense
​ | ​ |  | (77) | ​ | Total before tax
​ | ​ |  | 24 | ​ | Provision for income taxes
​ | ​ | $ | (53) | ​ | Net of tax
​
​ | ​ | ​ | ​ | ​ | ​
For the three months ended March 31, 2019
​ |  | Amounts Reclassified from | ​ | ​
Details about Accumulated Other |  | Accumulated Other |  | Affected Line Item in the Statement
Comprehensive Loss Components |  | Comprehensive Loss | ​ | Where Net Income is Presented
(In thousands)
​ | ​ | ​ | ​ | ​ | ​
Cash flow hedges: |  | ​ |  | ​ |
Interest rate swaps | ​ | $ | (201) | ​ | Interest expense
​ | ​ |  | 62 | ​ | Tax benefit
​ | ​ | $ | (139) | ​ | Net of tax
​ | ​ | ​ | ​ | ​ | ​
Amortization of defined benefit pension items: | ​ |  |  | ​ |
Actuarial losses | ​ | $ | (32) | (1) | Other operating expense
Prior service credits | ​ |  | 22 | (1) | Other operating expense
​ | ​ |  | (10) | ​ | Total before tax
​ | ​ |  | 3 | ​ | Tax benefit
​ | ​ | $ | (7) | ​ | Net of tax

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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