Investment Securities - Held to Maturity (Details) $ in Thousands	Sep. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security	Sep. 30, 2019 USD ($) security
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	$ 224,799	$ 245,065	$ 255,095
Gross Unrealized Gains	8,745	4,647	4,077
Gross Unrealized Losses	(43)	(94)	(44)
Held-To-Maturity Securities, at Fair Value	233,501	249,618	259,128
Maturities of Debt Securities, at Amortized Cost:
Within One Year	20,290
From 1 - 5 Years	162,791
From 5 - 10 Years	40,656
Over 10 Years	1,062
Maturities of Debt Securities, at Fair Value:
Within One Year	20,489
From 1 - 5 Years	169,107
From 5 - 10 Years	42,825
Over 10 Years	1,080
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	1,476	1,438	3,845
12 Months or Longer	0	1,994	8,475
Total	$ 1,476	$ 3,432	$ 12,320
Number of Securities in a Continuous Loss Position | security	4	10	38
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 42	$ 85	$ 10
12 Months or Longer	1	9	34
Total	43	94	44
Equity Securities	1,511	2,063	1,996
State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	195,735	208,243	215,661
Gross Unrealized Gains	7,488	4,170	3,669
Gross Unrealized Losses	(43)	(94)	(34)
Held-To-Maturity Securities, at Fair Value	203,180	212,319	219,296
Maturities of Debt Securities, at Amortized Cost:
Within One Year	15,605
From 1 - 5 Years	138,412
From 5 - 10 Years	40,656
Over 10 Years	1,062
Maturities of Debt Securities, at Fair Value:
Within One Year	15,677
From 1 - 5 Years	143,598
From 5 - 10 Years	42,825
Over 10 Years	1,080
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	1,476	1,438	763
12 Months or Longer	0	1,994	6,764
Total	$ 1,476	$ 3,432	$ 7,527
Number of Securities in a Continuous Loss Position | security	4	10	19
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 42	$ 85	$ 1
12 Months or Longer	1	9	33
Total	43	94	34
Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	29,064	36,822	39,434
Gross Unrealized Gains	1,257	477	408
Gross Unrealized Losses	0	0	(10)
Held-To-Maturity Securities, at Fair Value	30,321	37,299	39,832
Maturities of Debt Securities, at Amortized Cost:
Within One Year	4,685
From 1 - 5 Years	24,379
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	4,812
From 1 - 5 Years	25,509
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	3,082
12 Months or Longer	0	0	1,711
Total	$ 0	$ 0	$ 4,793
Number of Securities in a Continuous Loss Position | security	0	0	19
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 9
12 Months or Longer	0	0	1
Total	0	0	10
Fair Value, Measurements, Recurring
Unrealized Losses on Securities in a Continuous Loss Position:
Equity Securities	1,511	2,063	1,996
Collateral Pledged
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value	221,844	237,969	244,373
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	10,669	1,703	1,844
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	11,049	1,720	1,854
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	18,395	35,119	37,590
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	$ 19,272	$ 35,579	$ 37,978