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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands	Sep. 30, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	5	21
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 30,697	$ 167,839
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (51)	$ (1,757)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	9	44
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 42,838	$ 307,481
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (260)	$ (6,871)
Temporarily Impaired Debt Securities, Number of Securities | security	14	65
Temporarily Impaired Debt Securities, Fair Value, Total	$ 73,535	$ 475,320
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (311)	$ (8,628)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 9,736
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ (222)
Temporarily Impaired Debt Securities, Number of Securities | security	0	1
Temporarily Impaired Debt Securities, Fair Value, Total	$ 0	$ 9,736
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (222)
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	0	7
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 0	$ 67,649
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (613)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	6
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 35,760
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ (461)
Temporarily Impaired Debt Securities, Number of Securities | security	0	13
Temporarily Impaired Debt Securities, Fair Value, Total	$ 0	$ 103,409
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (1,074)
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	2	2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 6,465	$ 12,495
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (42)	$ (44)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	6	14
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 27,869	$ 76,179
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (210)	$ (1,941)
Temporarily Impaired Debt Securities, Number of Securities | security	8	16
Temporarily Impaired Debt Securities, Fair Value, Total	$ 34,334	$ 88,674
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (252)	$ (1,985)
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	1	2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 3,948	$ 2,327
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (1)	$ (45)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	1	3
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 2,557	$ 9,241
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (22)	$ (372)
Temporarily Impaired Debt Securities, Number of Securities | security	2	5
Temporarily Impaired Debt Securities, Fair Value, Total	$ 6,505	$ 11,568
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (23)	$ (417)
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	2	8
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 20,284	$ 75,466
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (8)	$ (1,032)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	2	19
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 12,412	$ 171,318
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ (28)	$ (3,844)
Temporarily Impaired Debt Securities, Number of Securities | security	4	27
Temporarily Impaired Debt Securities, Fair Value, Total	$ 32,696	$ 246,784
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (36)	$ (4,876)
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	0	2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 0	$ 9,902
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (23)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 5,247
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ (31)
Temporarily Impaired Debt Securities, Number of Securities | security	0	3
Temporarily Impaired Debt Securities, Fair Value, Total	$ 0	$ 15,149
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (54)

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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