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INVESTMENT SECURITIES (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 Position | Dec. 31, 2013 Position
--- | --- | ---
Available-for-Sale Portfolio [Abstract] |  |
Amortized Cost | $ 2,421,718 | $ 2,217,165
Gross Unrealized Gains | 54,375 | 27,104
Gross Unrealized Losses | 10,162 | 58,106
Fair Value | 2,465,931 | 2,186,163
Other Securities [Abstract] |  |
Amortized Cost | 40,311 | 32,562
Fair Value | 40,311 | 32,562
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Available-for-sale/investment portfolio in unrealized loss positions less than 12 months qualitative disclosure, number of positions | 47 | 390
Available-for-sale/investment portfolio in unrealized loss positions for 12 months or longer, number of positions | 114 | 17
Total available-for-sale/investment portfolio in unrealized loss positions, number of positions | 161 | 407
Available-for-Sale Portfolio, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, fair value | 187,105 | 1,451,284
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, fair value | 332,023 | 16,397
Total available-for-sale/investment portfolio, unrealized loss position, fair value | 519,128 | 1,467,681
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, gross unrealized losses | 984 | 56,464
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, gross unrealized losses | 9,178 | 1,642
Total Available-for-sale/investment portfolio, unrealized loss position, gross unrealized losses | 10,162 | 58,106
Available-for-Sale, Amortized Cost [Abstract] |  |
Available-for-sale, amortized cost, due in one year or less | 49,520 |
Available-for-sale, amortized cost, due in one to five years | 156,732 |
Available-for-sale, amortized cost, due in five through ten years | 1,691,095 |
Available-for-sale, amortized cost, due after ten years | 268,908 |
Available-for-sale, amortized cost, with a single maturity date, subtotal | 2,166,255 |
Available-for-sale, government agency mortgage-backed securities, amortized cost, without a single maturity date | 236,819 |
Available-for-sale, government agency collateralized mortgage obligations, amortized cost, without a single maturity date | 18,394 |
Available-for-sale, amortized cost | 2,421,468 |
Available-for-Sale, Fair Value [Abstract] |  |
Available-for-sale, fair value, due in one year or less | 50,144 |
Available-for-sale, fair value, due in one to five years | 161,940 |
Available-for-sale, fair value, due in five through ten years | 1,710,084 |
Available-for-sale, fair value, due after ten years | 280,080 |
Available-for-sale, fair value with a single maturity date, subtotal | 2,202,248 |
Available-for-sale, government agency mortgage-backed securities, fair value, without single maturity date | 244,122 |
Available-for-sale, government agency collateralized mortgage obligations, fair value, without single maturity date | 19,130 |
Available-for-sale, fair value | 2,465,500 |
U.S. Treasury and Agency Obligations [Member] |  |
Available-for-Sale Portfolio [Abstract] |  |
Amortized Cost | 1,476,678 | 1,252,332
Gross Unrealized Gains | 17,210 | 1,119
Gross Unrealized Losses | 7,261 | 41,304
Fair Value | 1,486,627 | 1,212,147
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Available-for-sale/investment portfolio in unrealized loss positions less than 12 months qualitative disclosure, number of positions | 7 | 43
Available-for-sale/investment portfolio in unrealized loss positions for 12 months or longer, number of positions | 10 | 0
Total available-for-sale/investment portfolio in unrealized loss positions, number of positions | 17 | 43
Available-for-Sale Portfolio, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, fair value | 158,289 | 1,181,214
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, fair value | 230,998 | 0
Total available-for-sale/investment portfolio, unrealized loss position, fair value | 389,287 | 1,181,214
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, gross unrealized losses | 859 | 41,304
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, gross unrealized losses | 6,402 | 0
Total Available-for-sale/investment portfolio, unrealized loss position, gross unrealized losses | 7,261 | 41,304
Obligations of State and Political Subdivisions [Member] |  |
Available-for-Sale Portfolio [Abstract] |  |
Amortized Cost | 662,742 | 665,441
Gross Unrealized Gains | 26,621 | 15,919
Gross Unrealized Losses | 1,029 | 12,378
Fair Value | 688,334 | 668,982
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Available-for-sale/investment portfolio in unrealized loss positions less than 12 months qualitative disclosure, number of positions | 31 | 302
Available-for-sale/investment portfolio in unrealized loss positions for 12 months or longer, number of positions | 78 | 9
Total available-for-sale/investment portfolio in unrealized loss positions, number of positions | 109 | 311
Available-for-Sale Portfolio, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, fair value | 16,009 | 195,526
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, fair value | 49,434 | 4,974
Total available-for-sale/investment portfolio, unrealized loss position, fair value | 65,443 | 200,500
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, gross unrealized losses | 78 | 11,774
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, gross unrealized losses | 951 | 604
Total Available-for-sale/investment portfolio, unrealized loss position, gross unrealized losses | 1,029 | 12,378
Government Agency Mortgage-Backed Securities [Member] |  |
Available-for-Sale Portfolio [Abstract] |  |
Amortized Cost | 236,819 | 250,431
Gross Unrealized Gains | 9,088 | 8,660
Gross Unrealized Losses | 1,785 | 4,113
Fair Value | 244,122 | 254,978
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Available-for-sale/investment portfolio in unrealized loss positions less than 12 months qualitative disclosure, number of positions | 8 | 43
Available-for-sale/investment portfolio in unrealized loss positions for 12 months or longer, number of positions | 24 | 6
Total available-for-sale/investment portfolio in unrealized loss positions, number of positions | 32 | 49
Available-for-Sale Portfolio, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, fair value | 12,807 | 68,917
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, fair value | 48,830 | 8,713
Total available-for-sale/investment portfolio, unrealized loss position, fair value | 61,637 | 77,630
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, gross unrealized losses | 47 | 3,262
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, gross unrealized losses | 1,738 | 851
Total Available-for-sale/investment portfolio, unrealized loss position, gross unrealized losses | 1,785 | 4,113
Corporate Debt Securities [Member] |  |
Available-for-Sale Portfolio [Abstract] |  |
Amortized Cost | 26,835 | 26,932
Gross Unrealized Gains | 539 | 873
Gross Unrealized Losses | 87 | 218
Fair Value | 27,287 | 27,587
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Available-for-sale/investment portfolio in unrealized loss positions less than 12 months qualitative disclosure, number of positions | 0 | 1
Available-for-sale/investment portfolio in unrealized loss positions for 12 months or longer, number of positions | 1 | 1
Total available-for-sale/investment portfolio in unrealized loss positions, number of positions | 1 | 2
Available-for-Sale Portfolio, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, fair value | 0 | 3,026
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, fair value | 2,756 | 2,703
Total available-for-sale/investment portfolio, unrealized loss position, fair value | 2,756 | 5,729
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, gross unrealized losses | 0 | 31
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, gross unrealized losses | 87 | 187
Total Available-for-sale/investment portfolio, unrealized loss position, gross unrealized losses | 87 | 218
Government Agency Collateralized Mortgage Obligations [Member] |  |
Available-for-Sale Portfolio [Abstract] |  |
Amortized Cost | 18,394 | 21,779
Gross Unrealized Gains | 736 | 362
Gross Unrealized Losses | 0 | 93
Fair Value | 19,130 | 22,048
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Available-for-sale/investment portfolio in unrealized loss positions less than 12 months qualitative disclosure, number of positions | 1 | 1
Available-for-sale/investment portfolio in unrealized loss positions for 12 months or longer, number of positions | 1 | 1
Total available-for-sale/investment portfolio in unrealized loss positions, number of positions | 2 | 2
Available-for-Sale Portfolio, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, fair value | 0 | 2,601
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, fair value | 5 | 7
Total available-for-sale/investment portfolio, unrealized loss position, fair value | 5 | 2,608
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Available-for-sale/investment portfolio, unrealized loss position, less than 12 months, gross unrealized losses | 0 | 93
Available-for-sale/investment portfolio, unrealized loss position, 12 months or longer, gross unrealized losses | 0 | 0
Total Available-for-sale/investment portfolio, unrealized loss position, gross unrealized losses | 0 | 93
Marketable Equity Securities [Member] |  |
Available-for-Sale Portfolio [Abstract] |  |
Amortized Cost | 250 | 250
Gross Unrealized Gains | 181 | 171
Gross Unrealized Losses | 0 | 0
Fair Value | 431 | 421
Federal Home Loan Bank Common Stock [Member] |  |
Other Securities [Abstract] |  |
Amortized Cost | 19,814 | 12,053
Fair Value | 19,814 | 12,053
Federal Reserve Bank Common Stock [Member] |  |
Other Securities [Abstract] |  |
Amortized Cost | 16,050 | 16,050
Fair Value | 16,050 | 16,050
Other Equity Securities [Member] |  |
Other Securities [Abstract] |  |
Amortized Cost | 4,447 | 4,459
Fair Value | $ 4,447 | $ 4,459

X
- Definition This item represents the fair value of collateralized mortgage obligations, categorized neither as held-to-maturity nor trading securities, which do not have a single maturity date and which the Company has decided to disclose separately, rather than allocating such cost over several maturity groupings. + References No definition available. + Details
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- Definition This item represents the fair value of mortgage backed securities, categorized neither as held-to-maturity nor trading securities, which do not have a single maturity date and which the Company has decided to disclose separately, rather than allocating such cost over several maturity groupings. + References No definition available. + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents collateralized mortgage obligations, at cost basis, categorized neither as held-to-maturity nor trading securities, which do not have a single maturity date and which the Company has decided to disclose separately rather than allocating such cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings, and fair value hedge accounting adjustments, if any, over several maturity groupings. + References No definition available. + Details
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- Definition This item represents mortgage backed securities, at cost basis, categorized neither as held-to-maturity nor trading securities, without a single maturity date and which the Company has decided to disclose separately rather than allocating such cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings, and fair value hedge accounting adjustments, if any, over several maturity groupings. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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