Investment Securities Available for Sale (Details) $ in Thousands	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	$ 300,980	$ 322,491	$ 311,038
Available-for-Sale	298,812	317,535	305,589
Gross Unrealized Gains	659	290	354
Gross Unrealized Losses	2,827	5,246	5,803
Maturities of Debt Securities, at Amortized Cost:
Within One Year	31,211
From 1 - 5 Years	130,703
From 5 - 10 Years	117,616
Over 10 Years	21,450
Maturities of Debt Securities, at Fair Value:
Within One Year	31,133
From 1 - 5 Years	129,559
From 5 - 10 Years	117,008
Over 10 Years	21,112
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	53,131	107,550	136,627
12 Months or Longer	191,291	172,192	124,088
Total	$ 244,422	$ 279,742	$ 260,715
Number of Securities in a Continuous Loss Position	88	97	113
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 258	$ 841	$ 2,212
12 Months or Longer	2,569	4,405	3,591
Total	2,827	5,246	5,803
U.S. Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	35,519	47,071	60,264
Available-for-Sale	35,383	46,765	59,657
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	136	306	607
Maturities of Debt Securities, at Amortized Cost:
Within One Year	30,516
From 1 - 5 Years	5,003
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	30,432
From 1 - 5 Years	4,951
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	17,128
12 Months or Longer	35,383	46,765	42,529
Total	$ 35,383	$ 46,765	$ 59,657
Number of Securities in a Continuous Loss Position	7	10	14
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 266
12 Months or Longer	136	306	341
Total	136	306	607
State and Municipal Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	1,114	1,193	9,741
Available-for-Sale	1,116	1,195	9,743
Gross Unrealized Gains	2	2	7
Gross Unrealized Losses	0	0	5
Maturities of Debt Securities, at Amortized Cost:
Within One Year	201
From 1 - 5 Years	433
From 5 - 10 Years	0
Over 10 Years	480
Maturities of Debt Securities, at Fair Value:
Within One Year	203
From 1 - 5 Years	433
From 5 - 10 Years	0
Over 10 Years	480
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	7,421
12 Months or Longer	0	0	0
Total	$ 0	$ 0	$ 7,421
Number of Securities in a Continuous Loss Position	0	0	29
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 6
12 Months or Longer	0	0	0
Total	0	0	6
Mortgage-Backed Securities - Residential
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	263,347	273,227	240,033
Available-for-Sale	261,513	268,775	235,389
Gross Unrealized Gains	657	288	347
Gross Unrealized Losses	2,491	4,740	4,991
Maturities of Debt Securities, at Amortized Cost:
Within One Year	494
From 1 - 5 Years	125,267
From 5 - 10 Years	117,616
Over 10 Years	19,970
Maturities of Debt Securities, at Fair Value:
Within One Year	498
From 1 - 5 Years	124,175
From 5 - 10 Years	117,008
Over 10 Years	19,832
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	53,131	107,550	112,078
12 Months or Longer	155,108	124,627	80,759
Total	$ 208,239	$ 232,177	$ 192,837
Number of Securities in a Continuous Loss Position	80	86	69
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 258	$ 841	$ 1,940
12 Months or Longer	2,233	3,899	3,050
Total	2,491	4,740	4,990
Corporate and Other Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	1,000	1,000	1,000
Available-for-Sale	800	800	800
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	200	200	200
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	1,000
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	800
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	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
Collateral Pledged
Available-For-Sale Securities
Available-For-Sale Securities, Pledged as Collateral	255,028	236,163	229,857
US Treasury Securities | U.S. Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	0	0	0
Available-for-Sale	0	0	0
Agency Securities | U.S. Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	35,519	47,071	60,264
Available-for-Sale	35,383	46,765	59,657
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	70,358	72,095	59,446
Available-for-Sale	70,034	71,800	59,469
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	192,989	201,132	180,587
Available-for-Sale	$ 191,479	$ 196,975	$ 175,920