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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale $ 3,183,923 $ 2,398,923
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 14,163 30,181
Interest rate swaps, liabilities 656,551 469,587
Municipal Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 29,468 30,285
Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 0 0
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 3,183,923 2,398,923
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 14,163 30,181
Interest rate swaps, liabilities 14,163 30,181
Fair Value on Recurring Basis [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 0
Total liabilities 0 0
Fair Value on Recurring Basis [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 3,198,086 2,429,104
Total liabilities 14,163 30,181
Fair Value on Recurring Basis [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 0
Total liabilities 0 0
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 29,468 30,285
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | Mortgage-backed Securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | Mortgage-backed Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,563,214 1,904,935
Fair Value on Recurring Basis [Member] | Mortgage-backed Securities [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | CMO/REMIC [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | CMO/REMIC [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 590,158 462,814
Fair Value on Recurring Basis [Member] | CMO/REMIC [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 1,083 889
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 3,183,923 2,398,923
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 0 0
Interest rate swaps, liabilities 0 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 14,163 30,181
Interest rate swaps, liabilities 14,163 30,181
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 0 0
Interest rate swaps, liabilities 0 0
Fair Value on Recurring Basis [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 3,198,086 2,429,104
Total liabilities 14,163 30,181
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Municipal Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 29,468 30,285
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Mortgage-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,563,214 1,904,935
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO/REMIC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 590,158 462,814
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Other Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 1,083 889
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Investment Securities-AFS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 3,183,923 2,398,923
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 14,163 30,181
Interest rate swaps, liabilities $ 14,163 $ 30,181