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Investment Securities Maturity of Held-to-Maturity Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule of Held-to-maturity Securities [Line Items] |
Held-to-maturity Securities [Table Text Block] | Below is an analysis of the amortized cost and fair values of debt securities held to maturity at:
| March 31, 2018 |  | December 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
| (dollars in thousands)
Obligations of U.S. Government Agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | $ | 3,895 |  |  | $ | — |  |  | $ | (109 | ) |  | $ | 3,786 |  |  | $ | 3,925 |  |  | $ | — |  |  | $ | (14 | ) |  | $ | 3,911 |
Mortgage-Backed Securities- Commercial | 57,762 |  |  | — |  |  | (2,224 | ) |  | 55,538 |  |  | 58,249 |  |  | — |  |  | (1,394 | ) |  | 56,855 |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | 294,205 |  |  | — |  |  | (7,645 | ) |  | 286,560 |  |  | 305,126 |  |  | 10 |  |  | (2,552 | ) |  | 302,584 |
Mortgage-Backed Securities – Commercial | 13,859 |  |  | — |  |  | (299 | ) |  | 13,560 |  |  | 14,056 |  |  | — |  |  | (71 | ) |  | 13,985 |
Obligations of States and Political Subdivisions | 40,509 |  |  | 38 |  |  | (660 | ) |  | 39,887 |  |  | 40,540 |  |  | 335 |  |  | (161 | ) |  | 40,714 |
Debt Securities Issued by Foreign Governments | 200 |  |  | — |  |  | (3 | ) |  | 197 |  |  | 200 |  |  | — |  |  | — |  |  | 200 |
Total Securities Held to Maturity | $ | 410,430 |  |  | $ | 38 |  |  | $ | (10,940 | ) |  | $ | 399,528 |  |  | $ | 422,096 |  |  | $ | 345 |  |  | $ | (4,192 | ) |  | $ | 418,249 |
Schedule of Held-to-Maturity Securities by Maturity [Table Text Block] | The amortized cost and estimated fair value of debt securities held to maturity at March 31, 2018, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or prepayment penalties.
| Amortized Cost |  | Estimated Fair Value
| (dollars in thousands)
Due within 1 year | $ | 87 |  |  | $ | 86 |
Due after 1 but within 5 years | 3,646 |  |  | 3,626 |
Due after 5 but within 10 years | 35,350 |  |  | 34,764 |
Due after 10 years | 1,626 |  |  | 1,608 |
| 40,709 |  |  | 40,084 |
Mortgage-Backed Securities (a) | 369,721 |  |  | 359,444 |
Total Debt Securities | $ | 410,430 |  |  | $ | 399,528 |
(a) | Mortgage-Backed Securities include an amortized cost of $61.7 million and a fair value of $59.3 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $308.1 million and a fair value of $300.1 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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- Definition Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6435544&loc=d3e41834-113960 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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