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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details) $ in Thousands | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
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Schedule of Available-for-sale Securities [Line Items] |  |
Number of Securities, Less than 12 months | security | 21 | 94
Number of Securities, 12 months or longer | security | 198 | 90
Number of Securities, Total | security | 219 | 184
Fair Value - Less than 12 months | $ 72,036 | $ 829,310
Fair Value - 12 months or longer | 1,422,127 | 787,873
Fair Value - Total | 1,494,163 | 1,617,183
Gross Unrealized Losses - Less than 12 months | (366) | (9,542)
Gross Unrealized Losses - 12 months or longer | (49,997) | (23,546)
Gross Unrealized Losses - Total | $ (50,363) | $ (33,088)
Collateralized Mortgage Obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of Securities, Less than 12 months | security | 1 | 38
Number of Securities, 12 months or longer | security | 93 | 53
Number of Securities, Total | security | 94 | 91
Fair Value - Less than 12 months | $ 8,041 | $ 425,198
Fair Value - 12 months or longer | 700,095 | 408,526
Fair Value - Total | 708,136 | 833,724
Gross Unrealized Losses - Less than 12 months | (28) | (5,954)
Gross Unrealized Losses - 12 months or longer | (21,101) | (11,588)
Gross Unrealized Losses - Total | $ (21,129) | $ (17,542)
Mortgage-backed Securities, Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of Securities, Less than 12 months | security | 4 | 20
Number of Securities, 12 months or longer | security | 45 | 23
Number of Securities, Total | security | 49 | 43
Fair Value - Less than 12 months | $ 19,973 | $ 195,086
Fair Value - 12 months or longer | 363,334 | 230,616
Fair Value - Total | 383,307 | 425,702
Gross Unrealized Losses - Less than 12 months | (37) | (1,282)
Gross Unrealized Losses - 12 months or longer | (13,064) | (5,701)
Gross Unrealized Losses - Total | $ (13,101) | $ (6,983)
Mortgage-backed Securities, Commercial |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of Securities, Less than 12 months | security | 3 | 16
Number of Securities, 12 months or longer | security | 27 | 8
Number of Securities, Total | security | 30 | 24
Fair Value - Less than 12 months | $ 38,494 | $ 186,357
Fair Value - 12 months or longer | 312,428 | 115,008
Fair Value - Total | 350,922 | 301,365
Gross Unrealized Losses - Less than 12 months | (218) | (1,614)
Gross Unrealized Losses - 12 months or longer | (12,761) | (5,067)
Gross Unrealized Losses - Total | $ (12,979) | $ (6,681)
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of Securities, Less than 12 months | security | 13 | 18
Number of Securities, 12 months or longer | security | 32 | 3
Number of Securities, Total | security | 45 | 21
Fair Value - Less than 12 months | $ 5,528 | $ 9,295
Fair Value - 12 months or longer | 42,444 | 22,144
Fair Value - Total | 47,972 | 31,439
Gross Unrealized Losses - Less than 12 months | (83) | (69)
Gross Unrealized Losses - 12 months or longer | (1,897) | (806)
Gross Unrealized Losses - Total | $ (1,980) | $ (875)
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of Securities, Less than 12 months | security | 0 | 1
Number of Securities, 12 months or longer | security | 1 | 0
Number of Securities, Total | security | 1 | 1
Fair Value - Less than 12 months | $ 0 | $ 4,475
Fair Value - 12 months or longer | 3,826 | 0
Fair Value - Total | 3,826 | 4,475
Gross Unrealized Losses - Less than 12 months | 0 | (522)
Gross Unrealized Losses - 12 months or longer | (1,174) | 0
Gross Unrealized Losses - Total | $ (1,174) | $ (522)
Mutual funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of Securities, Less than 12 months | security |  | 1
Number of Securities, 12 months or longer | security |  | 3
Number of Securities, Total | security |  | 4
Fair Value - Less than 12 months |  | $ 8,899
Fair Value - 12 months or longer |  | 11,579
Fair Value - Total |  | 20,478
Gross Unrealized Losses - Less than 12 months |  | (101)
Gross Unrealized Losses - 12 months or longer |  | (384)
Gross Unrealized Losses - Total |  | $ (485)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: 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=82897076&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 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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