Investment Securities - Available for Sale (Details) $ in Thousands	Mar. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security	Mar. 31, 2019 USD ($) security
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	$ 372,058	$ 356,710	$ 300,980
Gross Unrealized Gains	7,663	1,904	659
Gross Unrealized Losses	(1,535)	(1,280)	(2,827)
Available-for-Sale at Fair Value	378,186	357,334	298,812
Maturities of Debt Securities, at Amortized Cost:
Within One Year	14,227
From 1 - 5 Years	330,493
From 5 - 10 Years	26,898
Over 10 Years	440
Maturities of Debt Securities, at Fair Value:
Within One Year	14,642
From 1 - 5 Years	336,860
From 5 - 10 Years	26,244
Over 10 Years	440
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	18,846	52,491	53,131
12 Months or Longer	60,062	97,964	191,291
Total	$ 78,908	$ 150,455	$ 244,422
Number of Securities in a Continuous Loss Position | security	28	55	88
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 316	$ 317	$ 258
12 Months or Longer	1,219	963	2,569
Total	1,535	1,280	2,827
Collateral Pledged
Available-For-Sale Securities
Available-For-Sale Securities, Pledged as Collateral, at Fair Value	273,124	164,426	255,028
U.S. Government & Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	5,002	5,002	35,519
Gross Unrealized Gains	179	52	0
Gross Unrealized Losses	0	0	(136)
Available-for-Sale at Fair Value	5,181	5,054	35,383
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	5,002
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	5,181
From 5 - 10 Years	0
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	35,383
Total	$ 0	$ 0	$ 35,383
Number of Securities in a Continuous Loss Position | security	0	0	7
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	136
Total	0	0	136
U.S. Government & Agency Obligations | Agency Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	5,002	5,002	35,519
Available-for-Sale at Fair Value	5,181	5,054	35,383
State and Municipal Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	723	764	1,114
Gross Unrealized Gains	0	0	2
Gross Unrealized Losses	0	0	0
Available-for-Sale at Fair Value	723	764	1,116
Maturities of Debt Securities, at Amortized Cost:
Within One Year	26
From 1 - 5 Years	257
From 5 - 10 Years	0
Over 10 Years	440
Maturities of Debt Securities, at Fair Value:
Within One Year	26
From 1 - 5 Years	257
From 5 - 10 Years	0
Over 10 Years	440
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	365,333	349,944	263,347
Gross Unrealized Gains	7,484	1,852	657
Gross Unrealized Losses	(1,335)	(1,080)	(2,491)
Available-for-Sale at Fair Value	371,482	350,716	261,513
Maturities of Debt Securities, at Amortized Cost:
Within One Year	14,201
From 1 - 5 Years	325,234
From 5 - 10 Years	25,898
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	14,616
From 1 - 5 Years	331,422
From 5 - 10 Years	25,444
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	18,846	52,491	53,131
12 Months or Longer	59,262	97,164	155,108
Total	$ 78,108	$ 149,655	$ 208,239
Number of Securities in a Continuous Loss Position | security	27	54	80
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 316	$ 317	$ 258
12 Months or Longer	1,019	763	2,233
Total	1,335	1,080	2,491
Mortgage- Backed Securities | US Government Agencies Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	58,089	61,102	70,358
Available-for-Sale at Fair Value	57,091	60,616	70,034
Mortgage- Backed Securities | US Government-sponsored Enterprises Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	307,244	288,842	192,989
Available-for-Sale at Fair Value	314,391	290,100	191,479
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