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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Balances of AOCI Including Current Period Other Comprehensive Income (Loss) and Reclassifications Out of AOCI (Detail) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2021

Sep. 30, 2020

Sep. 30, 2021

Sep. 30, 2020

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

^[1]

$ 4,241,571

$ 3,236,679

$ 4,106,002

^[2]

$ 3,122,381

Other comprehensive income (loss) before      reclassifications

11,128

(18,295)

20,626

3,798

Less: gain (loss) reclassified from AOCI

133

1,878

(4,953)

13,027

Tax effect

183

508

799

(550)

Net current-period other comprehensive income (loss)

11,178

(19,665)

26,378

(9,779)

Ending balance

4,266,149

4,053,893

4,266,149

4,053,893

Unrealized Gains (Losses) on Cash Flow Hedges

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

(2,760)

22,963

(20,028)

16,614

Other comprehensive income (loss) before      reclassifications

11,914

(16,094)

24,096

1,404

Less: gain (loss) reclassified from AOCI

133

1,878

(4,953)

13,027

Tax effect

0

0

0

0

Net current-period other comprehensive income (loss)

11,781

(17,972)

29,049

(11,623)

Ending balance

9,021

4,991

9,021

4,991

Unrealized Gains (Losses) on Available for-Sale Debt Securities

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

1,821

7,087

3,889

3,565

Other comprehensive income (loss) before      reclassifications

(786)

(2,201)

(3,470)

2,379

Less: gain (loss) reclassified from AOCI

0

0

0

0

Tax effect

183

508

799

(550)

Net current-period other comprehensive income (loss)

(603)

(1,693)

(2,671)

1,829

Ending balance

1,218

5,394

1,218

5,394

Other

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

0

0

0

(15)

Other comprehensive income (loss) before      reclassifications

0

0

0

15

Less: gain (loss) reclassified from AOCI

0

0

0

0

Tax effect

0

0

0

0

Net current-period other comprehensive income (loss)

0

0

0

15

Ending balance

0

0

0

0

Total

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning balance

^[1]

(939)

30,050

(16,139)

20,164

Ending balance

$ 10,239

$ 10,385

$ 10,239

$ 10,385

[1]	The beginning balances for the nine-month periods were derived from the audited Consolidated Financial Statements included in Company’s Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on February 26, 2021.
[2]	(1)December 31, 2020 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on February 26, 2021.

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