Regulatory Matters (Details) $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Bank Subsidiary
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital, Actual Amount	$ 2,014,788	$ 1,947,914
Common equity Tier 1 capital, Actual Ratio	0.1181	0.1296
Total capital (to risk-weighted assets), Amount
Total capital, Actual	$ 2,152,241	$ 2,056,675
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Actual	2,014,788	1,947,914
Tier I capital (to average assets), Amount
Tier 1 capital, Actual	$ 2,014,788	$ 1,947,914
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total capital (to Risk Weighted Assets), Actual	0.1262	0.1368
Total capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes	0.0800	0.0800
Tier 1 capital (to Risk Weighted Assets), Actual	0.1181	0.1296
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes	0.0600	0.0600
Tier 1 capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions	0.0800	0.0800
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)	0.1108	0.1120
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)	0.0400	0.0400
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum	$ 767,682	$ 676,328
Total capital, Required For Capital Adequacy Purposes	1,364,769	1,202,361
Tier 1 capital, Required For Capital Adequacy Purposes	1,023,577	901,771
Tier 1 capital, Required For Capital Adequacy Purposes	727,200	695,593
Common equity Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	1,108,875	976,919
Total capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 1,705,961	$ 1,502,952
Total capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions	0.1000	0.1000
Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 1,364,769	$ 1,202,361
Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 909,000	$ 869,491
Tier I Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage)	0.0500	0.0500
Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital, Actual Amount	$ 1,760,843	$ 1,657,754
Common equity Tier 1 capital, Actual Ratio	0.1032	0.1103
Total capital (to risk-weighted assets), Amount
Total capital, Actual	$ 2,000,653	$ 1,867,968
Total capital, Minimum Capital Adequacy With Capital Conservation Buffer	1,791,862	1,578,811
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Actual	1,863,200	1,759,207
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer	1,450,555	1,278,085
Tier I capital (to average assets), Amount
Tier 1 capital, Actual	$ 1,863,200	$ 1,759,207
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total capital (to Risk Weighted Assets), Actual	0.1172	0.1242
Total capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes	0.0800	0.0800
Total capital (to Risk Weighted assets), Minimum Capital Adequacy With Capital Conservation Buffer	10.50%	10.50%
Tier 1 capital (to Risk Weighted Assets), Actual	0.1092	0.1170
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes	0.0600	0.0600
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer	8.50%	8.50%
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)	0.1025	0.1011
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)	0.0400	0.0400
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum		$ 676,633
Total capital, Required For Capital Adequacy Purposes	$ 1,365,228	1,202,903
Tier 1 capital, Required For Capital Adequacy Purposes	1,023,921	902,178
Tier 1 capital, Required For Capital Adequacy Purposes	727,401	695,795
Bank
Total capital (to risk-weighted assets), Amount
Total capital, Minimum Capital Adequacy With Capital Conservation Buffer	1,791,259	1,578,099
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer	$ 1,450,067	$ 1,277,509
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total capital (to Risk Weighted assets), Minimum Capital Adequacy With Capital Conservation Buffer	10.50%	10.50%
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer	8.50%	8.50%
Common Equity Tier 1 \| Company
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer	$ 1,194,575	$ 1,052,540
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes	0.0450	0.0450
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer	7.00%	7.00%
Tier I capital (to average assets), Ratio
Tier 1 capital, Required For Capital Adequacy Purposes	$ 767,941
Common Equity Tier 1 \| Bank
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer	$ 1,194,173	$ 1,052,066
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer	7.00%	7.00%
Common equity tier 1 capital \| Bank Subsidiary
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes	0.0450	0.0450
Tier 1 capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions	0.0650	0.0650

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