v3.19.1

Investment Securities - Summary of Individual Securities in Continuous Unrealized Loss Position (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($)
Securities available-for-sale:
Less Than 12 Months, Fair Value	$ 11,744,000	$ 75,918,000
Less Than 12 Months, Gross Unrealized Losses	$ (42,000)	$ (911,000)
Less Than 12 Months, Number of Securities | security	9	59
12 months or Longer, Fair Value	$ 96,611,000	$ 43,844,000
12 months or Longer, Gross Unrealized Losses	$ (2,732,000)	$ (1,091,000)
12 months or Longer, Number of Securities | security	100	47
Total, Fair Value	$ 108,355,000	$ 119,762,000
Total, Gross Unrealized Losses	$ (2,774,000)	$ (2,002,000)
Total, Number of Securities | security	109	106
Securities held-to-maturity:
Less Than 12 Months, Fair Value	$ 4,622,000	$ 9,180,000
Less Than 12 Months, Gross Unrealized Losses	$ (61,000)	$ (98,000)
Less Than 12 Months, Number of Securities | security	9	11
12 Months or Longer, Fair Value	$ 14,532,000	$ 5,739,000
12 Months or Longer, Gross Unrealized Losses	$ (584,000)	$ (164,000)
12 Months or Longer, Number of Securities | security	18	7
Total, Fair Value	$ 19,154,000	$ 14,919,000
Total, Gross Unrealized Losses	$ (645,000)	$ (262,000)
Total, Number of Securities | security	27	18
OTTI, debt securities, including in earnings	$ 0	$ 0	$ 0
Mortgage-backed securities
Securities available-for-sale:
Less Than 12 Months, Fair Value	1,868,000	31,876,000
Less Than 12 Months, Gross Unrealized Losses	$ (6,000)	$ (352,000)
Less Than 12 Months, Number of Securities | security	2	29
12 months or Longer, Fair Value	$ 41,845,000	$ 18,762,000
12 months or Longer, Gross Unrealized Losses	$ (1,225,000)	$ (317,000)
12 months or Longer, Number of Securities | security	48	21
Total, Fair Value	$ 43,713,000	$ 50,638,000
Total, Gross Unrealized Losses	$ (1,231,000)	$ (669,000)
Total, Number of Securities | security	50	50
Securities held-to-maturity:
Less Than 12 Months, Fair Value	$ 2,022,000	$ 7,997,000
Less Than 12 Months, Gross Unrealized Losses	$ (23,000)	$ (93,000)
Less Than 12 Months, Number of Securities | security	1	6
12 Months or Longer, Fair Value	$ 14,035,000	$ 5,739,000
12 Months or Longer, Gross Unrealized Losses	$ (579,000)	$ (164,000)
12 Months or Longer, Number of Securities | security	15	7
Total, Fair Value	$ 16,057,000	$ 13,736,000
Total, Gross Unrealized Losses	$ (602,000)	$ (257,000)
Total, Number of Securities | security	16	13
Collateralized mortgage obligations
Securities available-for-sale:
Less Than 12 Months, Fair Value	$ 7,067,000	$ 31,191,000
Less Than 12 Months, Gross Unrealized Losses	$ (29,000)	$ (454,000)
Less Than 12 Months, Number of Securities | security	5	19
12 months or Longer, Fair Value	$ 34,943,000	$ 16,284,000
12 months or Longer, Gross Unrealized Losses	$ (1,002,000)	$ (554,000)
12 months or Longer, Number of Securities | security	34	19
Total, Fair Value	$ 42,010,000	$ 47,475,000
Total, Gross Unrealized Losses	$ (1,031,000)	$ (1,008,000)
Total, Number of Securities | security	39	38
SBA loan pool securities
Securities available-for-sale:
Less Than 12 Months, Fair Value	$ 2,809,000	$ 11,736,000
Less Than 12 Months, Gross Unrealized Losses	$ (7,000)	$ (103,000)
Less Than 12 Months, Number of Securities | security	2	9
12 months or Longer, Fair Value	$ 19,823,000	$ 8,798,000
12 months or Longer, Gross Unrealized Losses	$ (505,000)	$ (220,000)
12 months or Longer, Number of Securities | security	18	7
Total, Fair Value	$ 22,632,000	$ 20,534,000
Total, Gross Unrealized Losses	$ (512,000)	$ (323,000)
Total, Number of Securities | security	20	16
Municipal bonds
Securities available-for-sale:
Less Than 12 Months, Fair Value	$ 0	$ 1,115,000
Less Than 12 Months, Gross Unrealized Losses	$ 0	$ (2,000)
Less Than 12 Months, Number of Securities | security	0	2
12 months or Longer, Fair Value	$ 0	$ 0
12 months or Longer, Gross Unrealized Losses	$ 0	$ 0
12 months or Longer, Number of Securities | security	0	0
Total, Fair Value	$ 0	$ 1,115,000
Total, Gross Unrealized Losses	$ 0	$ (2,000)
Total, Number of Securities | security	0	2
Securities held-to-maturity:
Less Than 12 Months, Fair Value	$ 2,600,000	$ 1,183,000
Less Than 12 Months, Gross Unrealized Losses	$ (38,000)	$ (5,000)
Less Than 12 Months, Number of Securities | security	8	5
12 Months or Longer, Fair Value	$ 497,000	$ 0
12 Months or Longer, Gross Unrealized Losses	$ (5,000)	$ 0
12 Months or Longer, Number of Securities | security	3	0
Total, Fair Value	$ 3,097,000	$ 1,183,000
Total, Gross Unrealized Losses	$ (43,000)	$ (5,000)
Total, Number of Securities | security	11	5

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