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Loans - Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 20,029 | $ 14,761
Loans Not Past Due | 2,459,319 | 2,135,087
Total | 2,479,348 | 2,149,848
30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 7,834 | 5,751
60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4,691 | 2,449
Greater Than 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 7,504 | 6,561
Commercial, industrial, and agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4,736 | 4,139
Loans Not Past Due | 911,561 | 700,467
Total | 916,297 | 704,606
Commercial, industrial, and agricultural | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,379 | 2,745
Commercial, industrial, and agricultural | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 16 | 646
Commercial, industrial, and agricultural | Greater Than 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,341 | 748
Commercial mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4,213 | 525
Loans Not Past Due | 693,563 | 644,072
Total | 697,776 | 644,597
Commercial mortgages | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 858 | 233
Commercial mortgages | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,058 | 0
Commercial mortgages | Greater Than 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 297 | 292
Residential real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 9,877 | 8,439
Loans Not Past Due | 761,432 | 704,908
Total | 771,309 | 713,347
Residential real estate | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4,064 | 2,290
Residential real estate | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,319 | 1,494
Residential real estate | Greater Than 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4,494 | 4,655
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,124 | 1,573
Loans Not Past Due | 84,911 | 78,620
Total | 86,035 | 80,193
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 474 | 454
Consumer | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 283 | 307
Consumer | Greater Than 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 367 | 812
Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 79 | 85
Loans Not Past Due | 7,544 | 6,668
Total | 7,623 | 6,753
Credit cards | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 59 | 29
Credit cards | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 15 | 2
Credit cards | Greater Than 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 5 | 54
Overdrafts |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Loans Not Past Due | 308 | 352
Total | 308 | 352
Overdrafts | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Overdrafts | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Overdrafts | Greater Than 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 0 | $ 0

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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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