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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | $ 2,301,303 | $ 2,130,029
Gross Unrealized Holding Gain | 73,238 | 72,703
Gross Unrealized Holding Loss | (1,812) | (1,206)
Available-for-sale Securities, Total | 2,372,729 | 2,201,526
Total Percent | 100.00% | 100.00%
Government agency & government-sponsored enterprises [Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 37,191 | 46,273
Gross Unrealized Holding Gain | 175 | 234
Gross Unrealized Holding Loss | (4) |
Available-for-sale Securities, Total | 37,362 | 46,507
Total Percent | 1.57% | 2.11%
Residential mortgage-backed securities[Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 918,726 | 869,847
Gross Unrealized Holding Gain | 20,300 | 18,487
Gross Unrealized Holding Loss | (135) | (334)
Available-for-sale Securities, Total | 938,891 | 888,000
Total Percent | 39.58% | 40.33%
CMO's / REMIC's - Residential [Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 729,815 | 594,866
Gross Unrealized Holding Gain | 10,437 | 10,307
Gross Unrealized Holding Loss | (1,050) | (665)
Available-for-sale Securities, Total | 739,202 | 604,508
Total Percent | 31.15% | 27.46%
Municipal Bonds [Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 605,114 | 608,575
Gross Unrealized Holding Gain | 42,251 | 43,665
Gross Unrealized Holding Loss | (623) | (203)
Available-for-sale Securities, Total | 646,742 | 652,037
Total Percent | 27.26% | 29.62%
Other Securities [Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 10,457 | 10,468
Gross Unrealized Holding Gain | 75 | 10
Gross Unrealized Holding Loss |  | (4)
Available-for-sale Securities, Total | $ 10,532 | $ 10,474
Total Percent | 0.44% | 0.48%

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