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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) security | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) security
Number of Securities |  |  |
Less than 12 months | security | 95 |  | 32
12 months or longer | security | 3 |  | 1
Total | security | 98 |  | 33
Fair Value |  |  |
Less than 12 months | $ 1,141,449,000 |  | $ 370,123,000
12 months or longer | 6,541,000 |  | 4,119,000
Total | 1,147,990,000 |  | 374,242,000
Gross Unrealized Losses |  |  |
Less than 12 months | (22,161,000) |  | (982,000)
12 months or longer | (832,000) |  | (881,000)
Total | (22,993,000) |  | (1,863,000)
Accrued interest receivable for investment securities available for sale | 4,500,000 |  | 4,700,000
Allowance for credit losses for available for sale securities | 0 |  | $ 0
Net gains on sales of securities available for sale | $ 0 | $ 0 |
Collateralized mortgage obligations |  |  |
Number of Securities |  |  |
Less than 12 months | security | 24 |  | 22
12 months or longer | security | 2 |  | 0
Total | security | 26 |  | 22
Fair Value |  |  |
Less than 12 months | $ 453,139,000 |  | $ 312,757,000
12 months or longer | 2,347,000 |  | 0
Total | 455,486,000 |  | 312,757,000
Gross Unrealized Losses |  |  |
Less than 12 months | (6,475,000) |  | (844,000)
12 months or longer | (25,000) |  | 0
Total | (6,500,000) |  | $ (844,000)
Allowance for credit losses for available for sale securities | 0 |  |
Mortgage-backed securities |  |  |
Gross Unrealized Losses |  |  |
Allowance for credit losses for available for sale securities | $ 0 |  |
Mortgage-backed securities: Residential |  |  |
Number of Securities |  |  |
Less than 12 months | security | 44 |  | 8
12 months or longer | security | 0 |  | 0
Total | security | 44 |  | 8
Fair Value |  |  |
Less than 12 months | $ 507,249,000 |  | $ 46,094,000
12 months or longer | 0 |  | 0
Total | 507,249,000 |  | 46,094,000
Gross Unrealized Losses |  |  |
Less than 12 months | (11,771,000) |  | (114,000)
12 months or longer | 0 |  | 0
Total | (11,771,000) |  | (114,000)
Allowance for credit losses for available for sale securities | $ 0 |  | $ 0
Mortgage-backed securities: Commercial |  |  |
Number of Securities |  |  |
Less than 12 months | security | 13 |  | 1
12 months or longer | security | 0 |  | 0
Total | security | 13 |  | 1
Fair Value |  |  |
Less than 12 months | $ 136,164,000 |  | $ 10,275,000
12 months or longer | 0 |  | 0
Total | 136,164,000 |  | 10,275,000
Gross Unrealized Losses |  |  |
Less than 12 months | (3,118,000) |  | (21,000)
12 months or longer | 0 |  | 0
Total | (3,118,000) |  | (21,000)
Allowance for credit losses for available for sale securities | $ 0 |  | $ 0
Corporate securities |  |  |
Number of Securities |  |  |
Less than 12 months | security | 3 |  | 0
12 months or longer | security | 1 |  | 1
Total | security | 4 |  | 1
Fair Value |  |  |
Less than 12 months | $ 9,011,000 |  | $ 0
12 months or longer | 4,194,000 |  | 4,119,000
Total | 13,205,000 |  | 4,119,000
Gross Unrealized Losses |  |  |
Less than 12 months | (423,000) |  | 0
12 months or longer | (807,000) |  | (881,000)
Total | (1,230,000) |  | (881,000)
Allowance for credit losses for available for sale securities | $ 0 |  | $ 0
Municipal securities |  |  |
Number of Securities |  |  |
Less than 12 months | security | 10 |  | 1
12 months or longer | security | 0 |  | 0
Total | security | 10 |  | 1
Fair Value |  |  |
Less than 12 months | $ 31,371,000 |  | $ 997,000
12 months or longer | 0 |  | 0
Total | 31,371,000 |  | 997,000
Gross Unrealized Losses |  |  |
Less than 12 months | (338,000) |  | (3,000)
12 months or longer | 0 |  | 0
Total | (338,000) |  | (3,000)
Allowance for credit losses for available for sale securities | $ 0 |  | $ 0
U.S. Government Agency and U.S. Government Sponsored Enterprises |  |  |
Gross Unrealized Losses |  |  |
Percentage of portfolio | 93.00% |  |
Asset-backed Securities |  |  |
Number of Securities |  |  |
Less than 12 months | security | 1 |  |
12 months or longer | security | 0 |  |
Total | security | 1 |  |
Fair Value |  |  |
Less than 12 months | $ 4,515,000 |  |
12 months or longer | 0 |  |
Total | 4,515,000 |  |
Gross Unrealized Losses |  |  |
Less than 12 months | (36,000) |  |
12 months or longer | 0 |  |
Total | (36,000) |  |
Allowance for credit losses for available for sale securities | $ 0 |  |

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