Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	$ 0	$ 432
Gross Amounts Recognized on the Consolidated Balance Sheets	124,561	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	0	0
Other Assets | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	65,127	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	52	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	63,224	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	1,833	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	51,589	21,374
Other Liabilities | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gross Amounts Recognized on the Consolidated Balance Sheets	73,715	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	73,067	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	$ 630	$ (241)