Investment Securities - Held-to-Maturity and Available-for-Sale, Scheduled Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity, Amortized Cost	$ 183,845	$ 142,634
Securities Held-to-Maturity, Gross Unrealized Gains	2,946	287
Securities Held-to-Maturity, Gross Unrealized Losses	(147)	(1,346)
Securities Held-to-Maturity, Fair Value	186,644	141,575
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Debt Securities, Fair Value	262,143	328,507
Debt Securities, Available-For-Sale And Held-To-Maturity, Amortized Cost	268,554	342,711
Securities Available-for-Sale,Gross Unrealized Gain	1,464	394
Securities Available-for-Sale, Gross Unrealized Loss	(7,875)	(14,598)
Securities Available-for-Sale, Fair Value	262,143	328,507
U.S. Government Corporations and Agencies [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity, Amortized Cost, After 1 year to five year	6,997	6,996
Securities Held-to-Maturity, Gross Unrealized Gains, After 1 year to 5 years	60	0
Securities Held-to-Maturity, Gross Unrealized Losses, After 1 year to 5 years	0	(104)
Securities Held-to-Maturity, Fair Value, After 1 year to 5 years	7,057	6,892
Securities Held-to-Maturity, Amortized Cost	6,997	6,996
Securities Held-to-Maturity, Gross Unrealized Gains	60	0
Securities Held-to-Maturity, Gross Unrealized Losses	0	(104)
Securities Held-to-Maturity, Fair Value	7,057	6,892
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	301	15,108
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	(2)	(90)
Securities Available-for-Sale, Fair Value, Within 1 year	299	15,018
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	0	303
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	0	(6)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	0	297
Securities Available-for-Sale, Amortized Cost	301	15,411
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	0	0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(2)	(96)
Securities Available-for-Sale, Debt Securities, Fair Value	299	15,315
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	350	5,900
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	1	4
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	(6)
Securities Available-for-Sale, Fair Value, Within 1 year	351	5,898
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	5,809	15,459
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	42	36
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	0	(56)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	5,851	15,439
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	33,809	43,923
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	375	318
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0	(163)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	34,184	44,078
Securities Available-for-Sale, Amortized Cost	39,968	65,282
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	418	358
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0	(225)
Securities Available-for-Sale, Debt Securities, Fair Value	40,386	65,415
Residential Mortgage-Backed Securities [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity Securities, Amortized Cost, After 5 years to 10 years	9,720	11,573
Securities Held-to-Maturity, Gross Unrealized Gains, After 5 years to 10 years	116	0
Securities Held-to-Maturity,Gross Unrecognized Losses, After 5 years to 10 years	0	(135)
Securities Held-to-Maturity, Fair Value, After 5 years to 10 years	9,836	11,438
Securities Held-to-Maturity, Over 10 years	167,128	124,065
Securities Held-to-Maturity, Gross Unrealized Gain, Over 10 years	2,770	287
Securities Held-to-Maturity, Gross Unrealized Losses, Over 10 years	(147)	(1,107)
Securities Held-to-Maturity, Fair Value, After 10 years	169,751	123,245
Securities Held-to-Maturity, Amortized Cost	176,848	135,638
Securities Held-to-Maturity, Gross Unrealized Gains	2,886	287
Securities Held-to-Maturity, Gross Unrealized Losses	(147)	(1,242)
Securities Held-to-Maturity, Fair Value	179,587	134,683
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	48	0
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	2	0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	0
Securities Available-for-Sale, Fair Value, Within 1 year	50	0
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	1,082	5,799
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	14	3
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(2)	(70)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	1,094	5,732
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	36,892	49,904
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	78	6
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(130)	(1,381)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	36,840	48,529
Securities Available-for-Sale, Amortized Cost, Over 10 years	87,317	100,873
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	404	26
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(468)	(3,398)
Securities Available-for-Sale, Fair Value, Over 10 years	87,253	97,501
Securities Available-for-Sale, Amortized Cost	125,339	156,576
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	498	35
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(600)	(4,849)
Securities Available-for-Sale, Debt Securities, Fair Value	125,237	151,762
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	1,403	1,677
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(23)	(78)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	1,380	1,599
Securities Available-for-Sale, Amortized Cost, Over 10 years	1,131	1,305
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	12	0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	0	(16)
Securities Available-for-Sale, Fair Value, Over 10 years	1,143	1,289
Securities Available-for-Sale, Amortized Cost	2,534	2,982
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	12	0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(23)	(94)
Securities Available-for-Sale, Debt Securities, Fair Value	2,523	2,888
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	11,303	7,806
Securities Available-for-Sale,Gross Unrealized Gain, Within 1 year	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	(13)	(68)
Securities Available-for-Sale, Fair Value, Within 1 year	11,290	7,738
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	29,109	18,508
Securities Available-for-Sale,Gross Unrealized Gain, After 1 year to 5 years	536	1
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(45)	(332)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	29,600	18,177
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	0	16,146
Securities Available-for-Sale,Gross Unrealized Gain, After 5 years to 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0	(392)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	0	15,754
Securities Available-for-Sale, Amortized Cost, Over 10 years	60,000	60,000
Securities Available-for-Sale,Gross Unrealized Gain, Over 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(7,192)	(8,542)
Securities Available-for-Sale, Fair Value, Over 10 years	52,808	51,458
Securities Available-for-Sale, Amortized Cost	100,412	102,460
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	536	1
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(7,250)	(9,334)
Securities Available-for-Sale, Debt Securities, Fair Value	$ 93,698	$ 93,127