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Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Noncovered Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       $ 83,369       $ 75,646 $ 83,369 $ 75,646 $ 70,043
Charge-offs                 (15,215) (18,555) (16,660)
Recoveries                 12,321 11,509 13,632
Provision for loan and lease losses $ 1,614 $ 299 $ 218 1,362 $ 1,789 $ 3,153 $ 3,975 5,852 3,493 14,769 8,631
Balance at the end of year 83,968       83,369       83,968 83,369 75,646
Specific Reserve 461       2,132       461 2,132 2,360
General Allocation 83,507       81,237       83,507 81,237 73,286
Consumer [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       5,301       5,163 5,301 5,163 3,534
Charge-offs                 (1,400) (1,194) (1,474)
Recoveries                 930 1,180 1,187
Provision for loan and lease losses                 (376) 152 1,916
Balance at the end of year 4,455       5,301       4,455 5,301 5,163
Specific Reserve 22       31       22 31 199
General Allocation 4,433       5,270       4,433 5,270 4,964
Purchased Credit Impaired Loans [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       3,611       6,907 3,611 6,907 10,515
Charge-offs                 (3,319) (4,862) (6,812)
Recoveries                 3,979 3,847 6,187
Provision for loan and lease losses                 (1,427) (2,281) (2,983)
Balance at the end of year 2,844       3,611       2,844 3,611 6,907
Specific Reserve 0       0       0 0 0
General Allocation 2,844       3,611       2,844 3,611 6,907
Unallocated Financing Receivables [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       1,053       0 1,053 0 226
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan and lease losses                 (453) 1,053 (226)
Balance at the end of year 600       1,053       600 1,053 0
Specific Reserve 0       0       0 0 0
General Allocation 600       1,053       600 1,053 0
Commercial business: Secured loans [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       43,188       29,341 43,188 29,341 36,050
Charge-offs                 (10,249) (11,560) (7,524)
Recoveries                 2,755 3,024 4,283
Provision for loan and lease losses                 7,381 22,383 (3,468)
Balance at the end of year 43,075       43,188       43,075 43,188 29,341
Specific Reserve 93       2,023       93 2,023 1,867
General Allocation 42,982       41,165       42,982 41,165 27,474
Commercial business: Unsecured loans [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       2,626       2,000 2,626 2,000 960
Charge-offs                 (75) (159) (89)
Recoveries                 350 403 553
Provision for loan and lease losses                 184 382 576
Balance at the end of year 3,085       2,626       3,085 2,626 2,000
Specific Reserve 0       0       0 0 3
General Allocation 3,085       2,626       3,085 2,626 1,997
Real estate: One-to-four family residential [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       593       701 593 701 599
Charge-offs                 (2) 0 (460)
Recoveries                 242 408 568
Provision for loan and lease losses                 (226) (516) (6)
Balance at the end of year 607       593       607 593 701
Specific Reserve 5       8       5 8 103
General Allocation 602       585       602 585 598
Real estate: Commercial and multifamily residential: Commercial land [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       3,947       4,265 3,947 4,265 1,797
Charge-offs                 0 0 0
Recoveries                 286 99 53
Provision for loan and lease losses                 2,146 (417) 2,415
Balance at the end of year 6,379       3,947       6,379 3,947 4,265
Specific Reserve 312       0       312 0 0
General Allocation 6,067       3,947       6,067 3,947 4,265
Real estate: Commercial and multifamiIy residential: Income property [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       4,044       5,672 4,044 5,672 7,342
Charge-offs                 0 (780) (287)
Recoveries                 320 912 498
Provision for loan and lease losses                 2,062 (1,760) (1,881)
Balance at the end of year 6,426       4,044       6,426 4,044 5,672
Specific Reserve 0       1       0 1 185
General Allocation 6,426       4,043       6,426 4,043 5,487
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       4,533       5,459 4,533 5,459 6,439
Charge-offs                 0 0 0
Recoveries                 4 20 124
Provision for loan and lease losses                 1,567 (946) (1,104)
Balance at the end of year 6,104       4,533       6,104 4,533 5,459
Specific Reserve 29       69       29 69 3
General Allocation 6,075       4,464       6,075 4,464 5,456
Real estate construction: One-to-four family residential: Land and acquisition [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       549       963 549 963 316
Charge-offs                 0 0 (14)
Recoveries                 362 726 72
Provision for loan and lease losses                 (799) (1,140) 589
Balance at the end of year 112       549       112 549 963
Specific Reserve 0       0       0 0 0
General Allocation 112       549       112 549 963
Real estate construction: One-to-four family residential: Residential construction [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       5,536       3,709 5,536 3,709 669
Charge-offs                 (170) 0 0
Recoveries                 3,092 890 106
Provision for loan and lease losses                 (3,982) 937 2,934
Balance at the end of year 4,476       5,536       4,476 5,536 3,709
Specific Reserve 0       0       0 0 0
General Allocation 4,476       5,536       4,476 5,536 3,709
Real estate construction: Commercial and multifamily residential: Income property [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       5,784       7,053 5,784 7,053 404
Charge-offs                 0 0 0
Recoveries                 1 0 1
Provision for loan and lease losses                 (3,286) (1,269) 6,648
Balance at the end of year 2,499       5,784       2,499 5,784 7,053
Specific Reserve 0       0       0 0 0
General Allocation 2,499       5,784       2,499 5,784 7,053
Real estate construction: Commercial and multifamily residential: Owner occupied [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       $ 2,604       $ 4,413 2,604 4,413 1,192
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan and lease losses                 702 (1,809) 3,221
Balance at the end of year 3,306       2,604       3,306 2,604 4,413
Specific Reserve 0       0       0 0 0
General Allocation $ 3,306       $ 2,604       $ 3,306 $ 2,604 $ 4,413