Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	$ 578	$ 432
Gross Amounts Recognized on the Consolidated Balance Sheets	117,602	45,727
Other Assets | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	578	0
Other Assets | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	65,871	23,608
Other Assets | Not Designated as Hedging Instrument | Residential real estate
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	215	79
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	65,207	23,301
Other Assets | Not Designated as Hedging Instrument | Interest Rate Cap
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	18	9
Other Assets | Not Designated as Hedging Instrument | Credit Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	431	219
Other Liabilities | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	48,344	21,374
Other Liabilities | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	69,845	24,565
Other Liabilities | Not Designated as Hedging Instrument | Residential real estate
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	0	0
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	69,259	24,797
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Cap
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	18	9
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	$ 568	$ (241)