Investment Securities - Available for Sale (Details) $ in Thousands	Sep. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security	Sep. 30, 2019 USD ($) security
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	$ 366,481	$ 356,710	$ 313,342
Gross Unrealized Gains	8,884	1,904	1,535
Gross Unrealized Losses	(437)	(1,280)	(695)
Available-for-Sale at Fair Value	374,928	357,334	314,182
Maturities of Debt Securities, at Amortized Cost:
Within One Year	7,451
From 1 - 5 Years	317,270
From 5 - 10 Years	41,760
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	7,643
From 1 - 5 Years	325,858
From 5 - 10 Years	41,427
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	43,829	52,491	4,763
12 Months or Longer	55,039	97,964	115,283
Total	$ 98,868	$ 150,455	$ 120,046
Number of Securities in a Continuous Loss Position | security	31	55	49
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 54	$ 317	$ 70
12 Months or Longer	383	963	625
Total	437	1,280	695
Collateral Pledged
Available-For-Sale Securities
Available-For-Sale Securities, Pledged as Collateral, at Fair Value	308,879	164,426	232,043
U.S. Government & Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	35,001	5,002	5,003
Gross Unrealized Gains	184	52	53
Gross Unrealized Losses	(18)	0	0
Available-for-Sale at Fair Value	35,167	5,054	5,056
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	20,001
From 5 - 10 Years	15,000
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	20,171
From 5 - 10 Years	14,996
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	29,982	0	0
12 Months or Longer	0	0	0
Total	$ 29,982	$ 0	$ 0
Number of Securities in a Continuous Loss Position | security	4	0	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 18	$ 0	$ 0
12 Months or Longer	0	0	0
Total	18	0	0
U.S. Government & Agency Obligations | Agency Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	35,001	5,002	5,003
Available-for-Sale at Fair Value	35,167	5,054	5,056
State and Municipal Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	593	764	965
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	0	0	0
Available-for-Sale at Fair Value	593	764	965
Maturities of Debt Securities, at Amortized Cost:
Within One Year	68
From 1 - 5 Years	125
From 5 - 10 Years	400
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	68
From 1 - 5 Years	125
From 5 - 10 Years	400
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	0	0	0
Total	$ 0	$ 0	$ 0
Number of Securities in a Continuous Loss Position | security	0	0	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	0
Total	0	0	0
Mortgage- Backed Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	329,887	349,944	306,374
Gross Unrealized Gains	8,700	1,852	1,482
Gross Unrealized Losses	(219)	(1,080)	(495)
Available-for-Sale at Fair Value	338,368	350,716	307,361
Maturities of Debt Securities, at Amortized Cost:
Within One Year	7,383
From 1 - 5 Years	297,144
From 5 - 10 Years	25,360
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	7,575
From 1 - 5 Years	305,562
From 5 - 10 Years	25,231
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	13,847	52,491	4,763
12 Months or Longer	54,239	97,164	114,483
Total	$ 68,086	$ 149,655	$ 119,246
Number of Securities in a Continuous Loss Position | security	26	54	48
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 36	$ 317	$ 70
12 Months or Longer	183	763	425
Total	219	1,080	495
Mortgage- Backed Securities | US Government Agencies Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	69,575	61,102	64,455
Available-for-Sale at Fair Value	69,407	60,616	64,364
Mortgage- Backed Securities | US Government-sponsored Enterprises Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	260,312	288,842	241,919
Available-for-Sale at Fair Value	268,961	290,100	242,997
Corporate and Other Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	1,000	1,000	1,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(200)	(200)	(200)
Available-for-Sale at Fair Value	800	800	800
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	1,000
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	800
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	800	800	800
Total	$ 800	$ 800	$ 800
Number of Securities in a Continuous Loss Position | security	1	1	1
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	200	200	200
Total	$ 200	$ 200	$ 200