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Loans - Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 17,153 | $ 19,129
Loans Not Past Due | 2,792,044 | 2,460,219
Total | 2,809,197 | 2,479,348
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,278 | 7,608
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,366 | 4,618
Greater Than 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 9,509 | 6,903
Commercial, industrial, and agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,605 | 4,612
Loans Not Past Due | 1,041,060 | 911,685
Total | 1,046,665 | 916,297
Commercial, industrial, and agricultural | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,273 | 2,339
Commercial, industrial, and agricultural | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 548 | 9
Commercial, industrial, and agricultural | Greater Than 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,784 | 2,264
Commercial mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,939 | 4,096
Loans Not Past Due | 811,063 | 693,680
Total | 814,002 | 697,776
Commercial mortgages | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 162 | 758
Commercial mortgages | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 183 | 3,055
Commercial mortgages | Greater Than 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,594 | 283
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,367 | 9,227
Loans Not Past Due | 806,663 | 762,082
Total | 814,030 | 771,309
Residential real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,383 | 3,982
Residential real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,270 | 1,257
Residential real estate | Greater Than 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,714 | 3,988
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,138 | 1,115
Loans Not Past Due | 123,647 | 84,920
Total | 124,785 | 86,035
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 412 | 470
Consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 311 | 282
Consumer | Greater Than 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 415 | 363
Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 104 | 79
Loans Not Past Due | 7,465 | 7,544
Total | 7,569 | 7,623
Credit cards | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 48 | 59
Credit cards | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 54 | 15
Credit cards | Greater Than 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2 | 5
Overdrafts |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Loans Not Past Due | 2,146 | 308
Total | 2,146 | 308
Overdrafts | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Overdrafts | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Overdrafts | Greater Than 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 0 | $ 0

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