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Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	$ 21,668	$ 145,676
Unrealized Losses, Less than 12 Months	(256)	(558)
Fair Value, 12 Months or Longer	37,362	107,451
Unrealized Losses, 12 Months or Longer	(297)	(950)
Fair Value, Total	59,030	253,127
Unrealized Losses, Total	(553)	(1,508)
U.S. government and agency securities
Investment Holdings [Line Items]
Fair Value, Less than 12 Months		45,999
Unrealized Losses, Less than 12 Months		(84)
Fair Value, 12 Months or Longer		0
Unrealized Losses, 12 Months or Longer		0
Fair Value, Total		45,999
Unrealized Losses, Total		(84)
Municipal securities
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	10,264	13,761
Unrealized Losses, Less than 12 Months	(227)	(102)
Fair Value, 12 Months or Longer	0	0
Unrealized Losses, 12 Months or Longer	0	0
Fair Value, Total	10,264	13,761
Unrealized Losses, Total	(227)	(102)
Residential mortgage-backed securities
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	0	14,272
Unrealized Losses, Less than 12 Months	0	(66)
Fair Value, 12 Months or Longer	25,293	60,232
Unrealized Losses, 12 Months or Longer	(209)	(439)
Fair Value, Total	25,293	74,504
Unrealized Losses, Total	(209)	(505)
Commercial mortgage-backed securities
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	11,404	56,263
Unrealized Losses, Less than 12 Months	(29)	(177)
Fair Value, 12 Months or Longer	7,499	43,623
Unrealized Losses, 12 Months or Longer	(61)	(472)
Fair Value, Total	18,903	99,886
Unrealized Losses, Total	(90)	(649)
Other asset-backed securities
Investment Holdings [Line Items]
Fair Value, Less than 12 Months		998
Unrealized Losses, Less than 12 Months		(2)
Fair Value, 12 Months or Longer		1,987
Unrealized Losses, 12 Months or Longer		(13)
Fair Value, Total		2,985
Unrealized Losses, Total		(15)
Other Security Investments
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	0	14,383
Unrealized Losses, Less than 12 Months	0	(127)
Fair Value, 12 Months or Longer	4,570	1,609
Unrealized Losses, 12 Months or Longer	(27)	(26)
Fair Value, Total	4,570	15,992
Unrealized Losses, Total	$ (27)	$ (153)

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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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