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Dividend Availability and Regulatory Matters Dividend Availability and Regulatory Matters (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Capital Conservation Buffer Percentage 2.50% 1.875%
Dividends Paid Exceeded Earnings $ 34,800,000  
Proceeds from Dividends Received 336,000,000.0  
Retained earnings 1,652,248,000 $ 1,182,674,000
Deferred Tax Assets, Regulatory Assets and Liabilities $ 195,000  
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00%  
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 6.00%  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Tier One Risk Based Capital Required to be Well Capitalized 6.50% 6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Common Equity Tier One Capital Ratio 4.50%  
Supplementary Leverage Ratio 4.00%  
Subordinated debentures $ 458,209,000 $ 453,846,000
Tier One Capital, Trust Preferred Securities Capital Portion 0  
Tier Two Capital, Trust Preferred Securities Capital Portion 444,500,000  
Pacific Western Bank    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Retained earnings 490,600,000  
Deferred Tax Assets, Regulatory Assets and Liabilities $ 0  
Capital Required to be Well Capitalized to Risk Weighted Assets   10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   8.00%
Tier One Risk Based Capital Required to be Well Capitalized   6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets   5.00%