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Investment Securities Held to Maturity (Details) $ in Thousands | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($)
--- | --- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Held-to-Maturity | $ 324,116 | $ 302,024 | $ 297,437 | $ 297,437
Held-to-Maturity Securities, at Fair Value | 328,361 | 308,566 |  | 304,259
Gross Unrealized Gains | 4,938 | 6,705 |  | 7,006
Gross Unrealized Losses | 692 | 163 |  | 184
Held-To-Maturity Securities, Pledged as Collateral | 300,040 | 282,640 |  | 296,437
Maturities of Debt Securities at Amortized Cost |  |  |  |
Within One Year | 19,962 |  |  |
From 1 - 5 Years | 163,118 |  |  |
From 5 - 10 Years | 125,269 |  |  |
Over 10 Years | 15,767 |  |  |
Maturities of Debt Securities, at Fair Value |  |  |  |
Within One Year | 19,972 |  |  |
From 1 - 5 Years | 165,533 |  |  |
From 5 - 10 Years | 127,110 |  |  |
Over 10 Years | 15,747 |  |  |
Securities in a Continuous Loss Position, at Fair Value |  |  |  |
Less than 12 Months | 0 | 6,724 |  | 12,258
12 Months or Longer | 48,715 | 16,033 |  | 15,033
Total | $ 48,715 | $ 22,757 |  | $ 27,291
Number of Securities in a Continuous Loss Position, in number of securities | 158 | 75 |  | 67
Unrealized Losses on Securities in a Continuous Loss Position |  |  |  |
Less than 12 Months | $ 0 | $ 25 |  | $ 56
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 692 | 138 |  | 128
Total | 692 | 163 |  | 184
State and Municipal Obligations [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Held-to-Maturity | 219,878 | 188,472 |  | 174,888
Held-to-Maturity Securities, at Fair Value | 223,031 | 193,252 |  | 180,211
Gross Unrealized Gains | 3,737 | 4,935 |  | 5,473
Gross Unrealized Losses | 583 | 155 |  | 150
Maturities of Debt Securities at Amortized Cost |  |  |  |
Within One Year | 19,962 |  |  |
From 1 - 5 Years | 93,785 |  |  |
From 5 - 10 Years | 91,364 |  |  |
Over 10 Years | 14,767 |  |  |
Maturities of Debt Securities, at Fair Value |  |  |  |
Within One Year | 19,972 |  |  |
From 1 - 5 Years | 95,510 |  |  |
From 5 - 10 Years | 92,802 |  |  |
Over 10 Years | 14,747 |  |  |
Securities in a Continuous Loss Position, at Fair Value |  |  |  |
Less than 12 Months | 0 | 2,143 |  | 2,697
12 Months or Longer | 44,748 | 16,033 |  | 13,839
Total | $ 44,748 | $ 18,176 |  | $ 16,536
Number of Securities in a Continuous Loss Position, in number of securities | 157 | 74 |  | 63
Unrealized Losses on Securities in a Continuous Loss Position |  |  |  |
Less than 12 Months | $ 0 | $ 17 |  | $ 29
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 583 | 138 |  | 121
Total | 583 | 155 |  | 150
Mortgage-Backed Securities - Residential [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Held-to-Maturity | 103,238 | 112,552 |  | 121,549
Held-to-Maturity Securities, at Fair Value | 104,330 | 114,314 |  | 123,048
Gross Unrealized Gains | 1,201 | 1,770 |  | 1,533
Gross Unrealized Losses | 109 | 8 |  | 34
Maturities of Debt Securities at Amortized Cost |  |  |  |
Within One Year | 0 |  |  |
From 1 - 5 Years | 69,333 |  |  |
From 5 - 10 Years | 33,905 |  |  |
Over 10 Years | 0 |  |  |
Maturities of Debt Securities, at Fair Value |  |  |  |
Within One Year | 0 |  |  |
From 1 - 5 Years | 70,023 |  |  |
From 5 - 10 Years | 34,308 |  |  |
Over 10 Years | 0 |  |  |
Securities in a Continuous Loss Position, at Fair Value |  |  |  |
Less than 12 Months | 0 | 4,581 |  | 9,561
12 Months or Longer | 3,967 | 0 |  | 1,194
Total | $ 3,967 | $ 4,581 |  | $ 10,755
Number of Securities in a Continuous Loss Position, in number of securities | 1 | 1 |  | 4
Unrealized Losses on Securities in a Continuous Loss Position |  |  |  |
Less than 12 Months | $ 0 | $ 8 |  | $ 27
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 109 | 0 |  | 7
Total | 109 | 8 |  | 34
Mortgage-Backed Securities - Residential [Member] | U.S. Government Agency Obligations [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Held-to-Maturity | 28,800 | 4,400 |  | 4,600
Held-to-Maturity Securities, at Fair Value | 29,000 | 4,500 |  | 4,700
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Held-to-Maturity | 74,500 | 108,100 |  | 116,900
Held-to-Maturity Securities, at Fair Value | 75,400 | 109,800 |  | 118,300
Corporate and Other Debt Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Held-to-Maturity | 1,000 | 1,000 |  | 1,000
Held-to-Maturity Securities, at Fair Value | 1,000 | 1,000 |  | 1,000
Gross Unrealized Gains | 0 | 0 |  | 0
Gross Unrealized Losses | 0 | 0 |  | 0
Maturities of Debt Securities at Amortized Cost |  |  |  |
Within One Year | 0 |  |  |
From 1 - 5 Years | 0 |  |  |
From 5 - 10 Years | 0 |  |  |
Over 10 Years | 1,000 |  |  |
Maturities of Debt Securities, at Fair Value |  |  |  |
Within One Year | 0 |  |  |
From 1 - 5 Years | 0 |  |  |
From 5 - 10 Years | 0 |  |  |
Over 10 Years | 1,000 |  |  |
Securities in a Continuous Loss Position, at Fair Value |  |  |  |
Less than 12 Months | 0 | 0 |  | 0
12 Months or Longer | 0 | 0 |  | 0
Total | $ 0 | $ 0 |  | $ 0
Number of Securities in a Continuous Loss Position, in number of securities | 0 | 0 |  | 0
Unrealized Losses on Securities in a Continuous Loss Position |  |  |  |
Less than 12 Months | $ 0 | $ 0 |  | $ 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 |  | 0
Total | $ 0 | $ 0 |  | $ 0

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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition The carrying amount of held-to-maturity securities that serve as collateral for borrowings. + References Reference 1: 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=49124121&loc=d3e5086-111524 + Details
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