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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized gains (losses) arising during the period | $ 1,995 | $ 666 | $ (1,093)
Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of income (loss) recognized in earnings | 3,545 | 790 | 3,118
Not Designated as Hedging Instrument | Other non-interest income | Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of income (loss) recognized in earnings | 3,409 | 604 | 2,955
Not Designated as Hedging Instrument | Other non-interest income | Credit contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of income (loss) recognized in earnings | 127 | 171 | 163
Not Designated as Hedging Instrument | Mortgage banking income | Residential mortgage loan commitments |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of income (loss) recognized in earnings | 9 | 15 | 0
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized gains (losses) arising during the period | 1,477 | 406 | (629)
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) | 2,917 |  |
Designated as Hedging Instrument | Other non-interest income | Interest Rate Swap | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) reclassified from accumulated OCI into income (ineffective portion) | 2,822 |  |
Designated as Hedging Instrument | Interest expense | Interest Rate Swap | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) | $ 95 | $ (2,634) | $ (1,946)

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- Definition Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Ineffective Portion, Net + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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