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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Recorded Investment, Unpaid Principal Balance, and Related Allowance for Loans and Leases Considered Impaired (Details) - Loans Excluding Acquired Impaired Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Recorded Investment	$ 68,741	$ 35,914	$ 31,111
Unpaid Principal Balance	75,668	41,231	34,479
Related Allowance	10,690	6,649	3,965
Average Recorded Investment	51,907	34,687	21,479
Interest Income Recognized	4,855	2,139	1,555
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	16,556	6,110	11,425
Recorded Investment, With an allowance recorded	9,840	5,873	2,459
Unpaid Principal Balance, With no related allowance recorded	19,808	7,693	12,936
Unpaid Principal Balance, With an allowance recorded	10,691	6,313	2,634
Related Allowance	2,614	2,191	1,101
Average Recorded Investment, With no related allowance recorded	11,218	8,968	10,482
Average Recorded Investment, With an allowance recorded	8,863	5,328	1,988
Interest Income Recognized, With no related allowance recorded	1,257	590	525
Interest Income Recognized, With an allowance recorded	711	270	187
Residential Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,165	1,886	2,075
Recorded Investment, With an allowance recorded	233	251	354
Unpaid Principal Balance, With no related allowance recorded	2,253	1,858	2,046
Unpaid Principal Balance, With an allowance recorded	233	253	351
Related Allowance	124	61	158
Average Recorded Investment, With no related allowance recorded	2,285	1,917	1,781
Average Recorded Investment, With an allowance recorded	195	311	422
Interest Income Recognized, With no related allowance recorded	192	43	72
Interest Income Recognized, With an allowance recorded	7	4	6
Construction, Land Development, and Other Land
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,644
Unpaid Principal Balance, With no related allowance recorded	3,000
Average Recorded Investment, With no related allowance recorded	220		295
Average Recorded Investment, With an allowance recorded			14
Interest Income Recognized, With no related allowance recorded	191		2
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	19,211	11,193	5,470
Recorded Investment, With an allowance recorded	18,092	10,601	9,314
Unpaid Principal Balance, With no related allowance recorded	20,398	13,961	6,774
Unpaid Principal Balance, With an allowance recorded	19,285	11,153	9,724
Related Allowance	7,952	4,397	2,692
Average Recorded Investment, With no related allowance recorded	14,137	8,680	2,875
Average Recorded Investment, With an allowance recorded	14,989	9,472	3,460
Interest Income Recognized, With no related allowance recorded	1,487	483	265
Interest Income Recognized, With an allowance recorded	$ 1,010	749	486
Installment and Other
Financing Receivable Impaired [Line Items]
Recorded Investment, With an allowance recorded			14
Unpaid Principal Balance, With an allowance recorded			14
Related Allowance			14
Average Recorded Investment, With an allowance recorded		$ 11	162
Interest Income Recognized, With an allowance recorded			$ 12

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