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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 44,555			$ 44,555	$ 43,476
Portfolio loans, net
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	1,833	$ 1,960	$ 1,476
Unpaid Contractual Principal Balance	29,179			29,179	26,047
Recorded Investment With No Allowance	3,473			3,473	5,823
Recorded Investment With Allowance	12,096			12,096	10,922
Total Recorded Investment	15,569			15,569	16,745
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2,408			2,408	4,453
Impaired Financing Receivable, Related Allowance	2,408			2,408	4,453
Average Recorded Investment				16,774	15,573
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,658)	(1,890)	(2,250)
Financing Receivable, Allowance for Credit Loss, Recovery	588	920	424
Financing Receivable, Allowance for Credit Loss	43,698	42,935	41,945	43,698	42,295
Portfolio loans, net | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	867	1,781	1,445
Unpaid Contractual Principal Balance	24,233			24,233	21,893
Recorded Investment With No Allowance	1,096			1,096	3,294
Recorded Investment With Allowance	10,337			10,337	9,656
Total Recorded Investment	11,433			11,433	12,950
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2,023			2,023	4,266
Impaired Financing Receivable, Related Allowance	2,023			2,023	4,266
Average Recorded Investment				12,429	13,827
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,295)	(1,380)	(1,853)
Financing Receivable, Allowance for Credit Loss, Recovery	209	32	29
Financing Receivable, Allowance for Credit Loss	28,874	29,093	28,660	28,874	29,039
Portfolio loans, net | Commercial - investor owned
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	333	364	769
Unpaid Contractual Principal Balance	3,312			3,312	553
Recorded Investment With No Allowance	1,135			1,135	398
Recorded Investment With Allowance	1,502			1,502	0
Total Recorded Investment	2,637			2,637	398
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	258			258	0
Impaired Financing Receivable, Related Allowance	258			258	0
Average Recorded Investment				2,525	277
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(431)	(120)
Financing Receivable, Allowance for Credit Loss, Recovery	11	52	7
Financing Receivable, Allowance for Credit Loss	5,668	5,324	5,339	5,668	4,683
Portfolio loans, net | Commercial - owner occupied
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	419	591	(431)
Unpaid Contractual Principal Balance	245			245	847
Recorded Investment With No Allowance	221			221	472
Recorded Investment With Allowance	0			0	336
Total Recorded Investment	221			221	808
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0			0	109
Impaired Financing Receivable, Related Allowance	0			0	109
Average Recorded Investment				27	691
Financing Receivable, Allowance for Credit Loss, Writeoff	(22)	0	(36)
Financing Receivable, Allowance for Credit Loss, Recovery	3	6	2
Financing Receivable, Allowance for Credit Loss	4,771	4,371	3,774	4,771	4,239
Portfolio loans, net | Construction and land development
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	(88)	(216)	(252)
Unpaid Contractual Principal Balance	0			0	0
Recorded Investment With No Allowance	0			0	0
Recorded Investment With Allowance	0			0	0
Total Recorded Investment	0			0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0			0	0
Impaired Financing Receivable, Related Allowance	0			0	0
Average Recorded Investment				0	0
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0	(45)
Financing Receivable, Allowance for Credit Loss, Recovery	260	489	9
Financing Receivable, Allowance for Credit Loss	2,144	1,972	1,699	2,144	1,987
Portfolio loans, net | Residential real estate
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	193	(345)	(288)
Unpaid Contractual Principal Balance	1,388			1,388	2,425
Recorded Investment With No Allowance	1,021			1,021	1,659
Recorded Investment With Allowance	246			246	618
Total Recorded Investment	1,267			1,267	2,277
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	116			116	52
Impaired Financing Receivable, Related Allowance	116			116	52
Average Recorded Investment				1,782	778
Financing Receivable, Allowance for Credit Loss, Writeoff	(255)	(26)	(67)
Financing Receivable, Allowance for Credit Loss, Recovery	65	124	364
Financing Receivable, Allowance for Credit Loss	1,381	1,378	1,625	1,381	1,616
Portfolio loans, net | Consumer and other
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	109	(215)	233
Unpaid Contractual Principal Balance	1			1	329
Recorded Investment With No Allowance	0			0	0
Recorded Investment With Allowance	11			11	312
Total Recorded Investment	11			11	312
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	11			11	26
Impaired Financing Receivable, Related Allowance	11			11	26
Average Recorded Investment				11	0
Financing Receivable, Allowance for Credit Loss, Writeoff	(86)	(53)	(129)
Financing Receivable, Allowance for Credit Loss, Recovery	40	217	13
Financing Receivable, Allowance for Credit Loss	$ 860	$ 797	$ 848	$ 860	$ 731

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