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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Available-For-Sale Securities [Table Text Block] | The following table is the schedule of Available-For-Sale Securities at September 30, 2016, December 31, 2015 and September 30, 2015:
Available-For-Sale Securities
|  | U.S. Agency Obligations |  | State and Municipal Obligations |  | Mortgage- Backed Securities - Residential |  | Corporate and Other Debt Securities |  | Mutual Funds and Equity Securities |  | Total Available- For-Sale Securities
September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Available-For-Sale Securities, at Amortized Cost |  | $ | 152,511 |  |  | $ | 31,562 |  |  | $ | 144,598 |  |  | $ | 4,500 |  |  | $ | 1,120 |  |  | $ | 334,291 |
Available-For-Sale Securities, at Fair Value |  | 153,926 |  |  | 31,628 |  |  | 148,087 |  |  | 4,299 |  |  | 1,250 |  |  | 339,190 |
Gross Unrealized Gains |  | 1,415 |  |  | 69 |  |  | 3,489 |  |  | — |  |  | 130 |  |  | 5,103 |
Gross Unrealized Losses |  | — |  |  | 3 |  |  | — |  |  | 201 |  |  | — |  |  | 204 |
Available-For-Sale Securities, Pledged as Collateral |  |  |  |  |  |  |  |  |  |  |  | 277,832 |
Maturities of Debt Securities, at Amortized Cost: |  |  |  |  |  |  |  |  |  |  |  |
Within One Year |  | $ | — |  |  | $ | 19,303 |  |  | $ | 10,214 |  |  | $ | 2,000 |  |  | $ | — |  |  | $ | 31,517 |
From 1 - 5 Years |  | 152,511 |  |  | 11,191 |  |  | 129,956 |  |  | 1,500 |  |  | — |  |  | 295,158 |
From 5 - 10 Years |  | — |  |  | 508 |  |  | 4,370 |  |  | — |  |  | — |  |  | 4,878 |
Over 10 Years |  | — |  |  | 560 |  |  | 58 |  |  | 1,000 |  |  | — |  |  | 1,618 |
Maturities of Debt Securities, at Fair Value: |  |  |  |  |  |  |  |  |  |  |  |
Within One Year |  | $ | — |  |  | $ | 19,304 |  |  | $ | 10,294 |  |  | $ | 1,999 |  |  | $ | — |  |  | $ | 31,597 |
From 1 - 5 Years |  | 153,926 |  |  | 11,256 |  |  | 132,916 |  |  | 1,500 |  |  | — |  |  | 299,598 |
From 5 - 10 Years |  | — |  |  | 508 |  |  | 4,814 |  |  | — |  |  | — |  |  | 5,322 |
Over 10 Years |  | — |  |  | 560 |  |  | 63 |  |  | 800 |  |  | — |  |  | 1,423 |
Securities in a Continuous Loss Position, at Fair Value: |  |  |  |  |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | — |  |  | $ | 9,237 |  |  | $ | — |  |  | $ | 1,022 |  |  | $ | — |  |  | $ | 10,259 |
12 Months or Longer |  | — |  |  | — |  |  | — |  |  | 1,800 |  |  | — |  |  | 1,800 |
Total |  | $ | — |  |  | $ | 9,237 |  |  | $ | — |  |  | $ | 2,822 |  |  | $ | — |  |  | $ | 12,059 |
Number of Securities in a Continuous Loss Position |  | — |  |  | 1 |  |  | 2 |  |  | 3 |  |  | — |  |  | 6 |
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |  |  |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 4 |
12 Months or Longer |  | — |  |  | — |  |  | — |  |  | 200 |  |  | — |  |  | 200 |
Total |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | 201 |  |  | $ | — |  |  | $ | 204 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Available-For-Sale Securities, at Amortized Cost |  | $ | 155,932 |  |  | $ | 52,306 |  |  | $ | 177,376 |  |  | $ | 14,544 |  |  | $ | 1,120 |  |  | $ | 401,278 |
Available-For-Sale Securities, at Fair Value |  | 155,782 |  |  | 52,408 |  |  | 178,588 |  |  | 14,299 |  |  | 1,232 |  |  | 402,309 |
Gross Unrealized Gains |  | 264 |  |  | 105 |  |  | 2,236 |  |  | — |  |  | 112 |  |  | 2,717 |
Gross Unrealized Losses |  | 414 |  |  | 3 |  |  | 1,024 |  |  | 245 |  |  | — |  |  | 1,686 |
Available-For-Sale Securities, Pledged as Collateral |  |  |  |  |  |  |  |  |  |  |  | 310,857 |
Available-For-Sale Securities
|  | U.S. Agency Obligations |  | State and Municipal Obligations |  | Mortgage- Backed Securities - Residential |  | Corporate and Other Debt Securities |  | Mutual Funds and Equity Securities |  | Total Available- For-Sale Securities
Securities in a Continuous Loss Position, at Fair Value: |  |  |  |  |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | 76,802 |  |  | $ | 4,289 |  |  | $ | 99,569 |  |  | $ | 3,616 |  |  | $ | — |  |  | $ | 184,276 |
12 Months or Longer |  | — |  |  | 1,443 |  |  | 903 |  |  | 10,671 |  |  | — |  |  | 13,017 |
Total |  | $ | 76,802 |  |  | $ | 5,732 |  |  | $ | 100,472 |  |  | $ | 14,287 |  |  | $ | — |  |  | $ | 197,293 |
Number of Securities in a Continuous Loss Position |  | 21 |  |  | 19 |  |  | 30 |  |  | 19 |  |  | — |  |  | 89 |
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |  |  |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | 413 |  |  | $ | 2 |  |  | $ | 1,023 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 1,440 |
12 Months or Longer |  | 1 |  |  | 1 |  |  | 1 |  |  | 243 |  |  | — |  |  | 246 |
Total |  | $ | 414 |  |  | $ | 3 |  |  | $ | 1,024 |  |  | $ | 245 |  |  | $ | — |  |  | $ | 1,686 |
September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Available-For-Sale Securities, at Amortized Cost |  | $ | 161,253 |  |  | $ | 55,263 |  |  | $ | 158,351 |  |  | $ | 16,871 |  |  | $ | 1,120 |  |  | $ | 392,858 |
Available-For-Sale Securities, at Fair Value |  | 162,518 |  |  | 55,486 |  |  | 161,637 |  |  | 16,672 |  |  | 1,246 |  |  | 397,559 |
Gross Unrealized Gains |  | 1,269 |  |  | 223 |  |  | 3,292 |  |  | 12 |  |  | 125 |  |  | 4,921 |
Gross Unrealized Losses |  | 4 |  |  | — |  |  | 6 |  |  | 211 |  |  | — |  |  | 221 |
Available-For-Sale Securities, Pledged as Collateral |  |  |  |  |  |  |  |  |  |  |  | 348,115 |
Securities in a Continuous Loss Position, at Fair Value: |  |  |  |  |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
12 Months or Longer |  | 12,996 |  |  | 406 |  |  | 4,775 |  |  | 7,162 |  |  | — |  |  | 25,339 |
Total |  | $ | 12,996 |  |  | $ | 406 |  |  | $ | 4,775 |  |  | $ | 7,162 |  |  | $ | — |  |  | $ | 25,339 |
Number of Securities in a Continuous Loss Position |  | 3 |  |  | 1 |  |  | 1 |  |  | 11 |  |  | — |  |  | 16 |
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |  |  |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
12 Months or Longer |  | 4 |  |  | — |  |  | 6 |  |  | 211 |  |  | — |  |  | 221 |
Total |  | $ | 4 |  |  | $ | — |  |  | $ | 6 |  |  | $ | 211 |  |  | $ | — |  |  | $ | 221 |
Held-To-Maturity Securities [Table Text Block] | The following table is the schedule of Held-To-Maturity Securities at September 30, 2016, December 31, 2015 and September 30, 2015:
Held-To-Maturity Securities
|  | State and Municipal Obligations |  | Mortgage- Backed Securities - Residential |  | Corporate and Other Debt Securities |  | Total Held-To Maturity Securities
September 30, 2016 |  |  |  |  |  |  |  |
Held-To-Maturity Securities, at Amortized Cost |  | $ | 257,255 |  |  | $ | 79,983 |  |  | $ | 1,000 |  |  | $ | 338,238 |
Held-To-Maturity Securities, at Fair Value |  | 263,897 |  |  | 82,544 |  |  | 1,000 |  |  | 347,441 |
Gross Unrealized Gains |  | 6,712 |  |  | 2,561 |  |  | — |  |  | 9,273 |
Gross Unrealized Losses |  | 70 |  |  | — |  |  | — |  |  | 70 |
Held-To-Maturity Securities, Pledged as Collateral |  |  |  |  |  |  |  | 320,774 |
Held-To-Maturity Securities
|  | State and Municipal Obligations |  | Mortgage- Backed Securities - Residential |  | Corporate and Other Debt Securities |  | Total Held-To Maturity Securities
Maturities of Debt Securities, at Amortized Cost: |  |  |  |  |  |  |  |
Within One Year |  | $ | 35,911 |  |  | $ | — |  |  | $ | — |  |  | $ | 35,911 |
From 1 - 5 Years |  | 87,464 |  |  | 72,422 |  |  | — |  |  | 159,886 |
From 5 - 10 Years |  | 129,891 |  |  | 7,561 |  |  | — |  |  | 137,452 |
Over 10 Years |  | 3,989 |  |  | — |  |  | 1,000 |  |  | 4,989 |
Maturities of Debt Securities, at Fair Value: |  |  |  |  |  |  |  |
Within One Year |  | $ | 35,966 |  |  | $ | — |  |  | $ | — |  |  | $ | 35,966 |
From 1 - 5 Years |  | 89,979 |  |  | 74,680 |  |  | — |  |  | 164,659 |
From 5 - 10 Years |  | 133,817 |  |  | 7,864 |  |  | — |  |  | 141,681 |
Over 10 Years |  | 4,135 |  |  | — |  |  | 1,000 |  |  | 5,135 |
Securities in a Continuous Loss Position, at Fair Value: |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | 11,891 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,891 |
12 Months or Longer |  | 1,172 |  |  | — |  |  | — |  |  | 1,172 |
Total |  | $ | 13,063 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,063 |
Number of Securities in a Continuous Loss Position |  | 3 |  |  | — |  |  | — |  |  | 3 |
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | 68 |  |  | $ | — |  |  | $ | — |  |  | $ | 68 |
12 Months or Longer |  | 2 |  |  | — |  |  | — |  |  | 2 |
Total |  | $ | 70 |  |  | $ | — |  |  | $ | — |  |  | $ | 70 |
December 31, 2015 |  |  |  |  |  |  |  |
Held-To-Maturity Securities, at Amortized Cost |  | $ | 226,053 |  |  | $ | 93,558 |  |  | $ | 1,000 |  |  | $ | 320,611 |
Held-To-Maturity Securities, at Fair Value |  | 230,621 |  |  | 94,309 |  |  | 1,000 |  |  | 325,930 |
Gross Unrealized Gains |  | 4,619 |  |  | 868 |  |  | — |  |  | 5,487 |
Gross Unrealized Losses |  | 51 |  |  | 117 |  |  | — |  |  | 168 |
Held-To-Maturity Securities, Pledged as Collateral |  |  |  |  |  |  |  | 299,767 |
Securities in a Continuous Loss Position, at Fair Value: |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | 2,302 |  |  | $ | 6,000 |  |  | $ | — |  |  | $ | 8,302 |
12 Months or Longer |  | 11,764 |  |  | 4,154 |  |  | — |  |  | 15,918 |
Total |  | $ | 14,066 |  |  | $ | 10,154 |  |  | $ | — |  |  | $ | 24,220 |
Number of Securities in a Continuous Loss Position |  | 54 |  |  | 8 |  |  | — |  |  | 62 |
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | 11 |  |  | $ | 93 |  |  | $ | — |  |  | $ | 104 |
12 Months or Longer |  | 40 |  |  | 24 |  |  | — |  |  | 64 |
Total |  | $ | 51 |  |  | $ | 117 |  |  | $ | — |  |  | $ | 168 |
Held-To-Maturity Securities
|  | State and Municipal Obligations |  | Mortgage- Backed Securities - Residential |  | Corporate and Other Debt Securities |  | Total Held-To Maturity Securities
September 30, 2015 |  |  |  |  |  |  |  |
Held-To-Maturity Securities, at Amortized Cost |  | $ | 218,502 |  |  | $ | 97,978 |  |  | $ | 1,000 |  |  | $ | 317,480 |
Held-To-Maturity Securities, at Fair Value |  | 223,050 |  |  | 99,959 |  |  | 1,000 |  |  | 324,009 |
Gross Unrealized Gains |  | 4,633 |  |  | 1,981 |  |  | — |  |  | 6,614 |
Gross Unrealized Losses |  | 85 |  |  | — |  |  | — |  |  | 85 |
Held-To-Maturity Securities, Pledged as Collateral |  |  |  |  |  |  |  | 296,921 |
Securities in a Continuous Loss Position, at Fair Value: |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
12 Months or Longer |  | 14,896 |  |  | — |  |  | — |  |  | 14,896 |
Total |  | $ | 14,896 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,896 |
Number of Securities in a Continuous Loss Position |  | 51 |  |  | — |  |  | — |  |  | 51 |
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |  |  |  |  |  |
Less than 12 Months |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
12 Months or Longer |  | 85 |  |  | — |  |  | — |  |  | 85 |
Total |  | $ | 85 |  |  | $ | — |  |  | $ | — |  |  | $ | 85 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: 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=6957658&loc=d3e62557-112803 Reference 2: 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=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 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=6957658&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 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: 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=73527792&loc=d3e27290-111563 + Details
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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=73527792&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=73527792&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=73527792&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=6957658&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=73527792&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=66008989&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=6957658&loc=d3e62557-112803 + Details
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