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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) | Mar. 31, 2019 USD ($) Security | Dec. 31, 2018 USD ($) Security
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 27,221,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (191,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 459 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 1,217,852,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (25,373,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,245,073,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (25,564,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 14 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | $ 20,601,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (93,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 20,601,000
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | $ (93,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security |  | 6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security |  | 0
U.S. Government-Sponsored Agency Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security |  | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions |  | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 4,961,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (31,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 5,770,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (108,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 10,731,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (139,000)
State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 39 | 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 84,753,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (1,272,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 84,753,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (1,272,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 0 | 33
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 72,950,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (1,292,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 83,770,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (4,174,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 156,720,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (5,466,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 20,601,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (93,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 20,601,000
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | $ (93,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security |  | 6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security |  | 0
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 26,514,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (190,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 14 | 14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 26,646,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (2,138,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 53,160,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (2,328,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 8 | 8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 24,419,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (227,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 25,642,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (3,126,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 50,061,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (3,353,000)
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 707,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (1,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 90 | 89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 418,166,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (7,201,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 418,873,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (7,202,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 6 | 39
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 136,563,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (1,050,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 388,173,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (10,922,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 524,736,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (11,972,000)
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 116 | 110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 403,327,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (8,596,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 403,327,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (8,596,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 0 | 17
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 18,220,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (222,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 402,779,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (14,990,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 420,999,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (15,212,000)
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 23 | 25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 182,150,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (1,566,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 182,150,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (1,566,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 0 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 9,778,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (35,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 197,326,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (3,038,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 207,104,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (3,073,000)
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 177 | 177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 102,810,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (4,600,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 102,810,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (4,600,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 102,994,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (4,416,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 102,994,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (4,416,000)
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security |  | 454
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions |  | 99
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 266,891,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (2,857,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 1,206,454,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (40,774,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 1,473,345,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (43,631,000)

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