Investment Securities - Held to Maturity (Details) $ in Thousands	Mar. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security	Mar. 31, 2019 USD ($) security
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	$ 238,520	$ 245,065	$ 279,400
Gross Unrealized Gains	4,433	4,647	1,792
Gross Unrealized Losses	(149)	(94)	(778)
Held-To-Maturity Securities, at Fair Value	242,804	249,618	280,414
Maturities of Debt Securities, at Amortized Cost:
Within One Year	19,165
From 1 - 5 Years	147,180
From 5 - 10 Years	70,585
Over 10 Years	1,590
Maturities of Debt Securities, at Fair Value:
Within One Year	19,293
From 1 - 5 Years	149,856
From 5 - 10 Years	72,031
Over 10 Years	1,624
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	5,625	1,438	0
12 Months or Longer	1,867	1,994	97,471
Total	$ 7,492	$ 3,432	$ 97,471
Number of Securities in a Continuous Loss Position | security	16	10	222
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 16	$ 85	$ 0
12 Months or Longer	133	9	778
Total	149	94	778
Equity Securities	1,689	2,063	1,850
State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	204,148	208,243	234,454
Gross Unrealized Gains	3,104	4,170	1,695
Gross Unrealized Losses	(149)	(94)	(573)
Held-To-Maturity Securities, at Fair Value	207,103	212,319	235,576
Maturities of Debt Securities, at Amortized Cost:
Within One Year	16,308
From 1 - 5 Years	115,665
From 5 - 10 Years	70,585
Over 10 Years	1,590
Maturities of Debt Securities, at Fair Value:
Within One Year	16,329
From 1 - 5 Years	117,119
From 5 - 10 Years	72,031
Over 10 Years	1,624
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	5,625	1,438	0
12 Months or Longer	1,867	1,994	71,450
Total	$ 7,492	$ 3,432	$ 71,450
Number of Securities in a Continuous Loss Position | security	16	10	193
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 16	$ 85	$ 0
12 Months or Longer	133	9	573
Total	149	94	573
Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	34,372	36,822	44,946
Gross Unrealized Gains	1,329	477	97
Gross Unrealized Losses	0	0	(205)
Held-To-Maturity Securities, at Fair Value	35,701	37,299	44,838
Maturities of Debt Securities, at Amortized Cost:
Within One Year	2,857
From 1 - 5 Years	31,515
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	2,964
From 1 - 5 Years	32,737
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	26,021
Total	$ 0	$ 0	$ 26,021
Number of Securities in a Continuous Loss Position | security	0	0	29
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	205
Total	0	0	205
Fair Value, Measurements, Recurring
Unrealized Losses on Securities in a Continuous Loss Position:
Equity Securities	1,689	2,063	1,850
Collateral Pledged
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value	231,539	237,969	265,465
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	1,594	1,703	2,069
US Government Agencies Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	1,655	1,720	2,012
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	32,778	35,119	42,877
US Government-sponsored Enterprises Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	$ 34,046	$ 35,579	$ 42,826